Hey there viewers and welcome back to the south main hub channel. That's a 1988. You heard it right. Folks, 1988 chevrolet, it's the ass time, four-wheel drive three pedals, two sticks and the big 2.8 and uh.

It's got some drivability issues, she's a mint southern truck, as i'm told, and it has a new engine in it. It's got a jasper engine. Somebody put in some sometime in its life. It's got the vice grips.

Uh he's throwing a lot of parts at its complaint. Is after you drive it for a while, uh really really high idle runs like poo. You got to shut it off and wait about 10-15 minutes, and then you can go again. Um he's done a lot of things.

Coolant sensor map sensor, throttle body, injectors and thermostat and plugs wires cap rotor coil. You know all this stuff, all the parts you can throw, including the vice grips on the air pump, and now we have to find out what's really wrong with it. I was just a young buck when these trucks came out. It's a bad country edition super rare option folks, so let's uh it's got a fragrance to it.

I got the scan tool uh that works with this thing, which is great, got one of these things. One of those no airbag so let's go for a ride. The best thing to do is probably collect. Some data here, which i'm gon na do sounds like a title and high already, but it is stone cold see.

If this thing still works. Oh she's got a little stumbly bumbly there. I want to look at some data and see if there's anything that really jumps out to me. So our data is live, looks like our o2 is not even moving at all.

I see that right initially and it is in closed loop uh. Let's see your black learn on old gms is like your uh uh. What do you want to say there? It's, like your fuel trim, 128 being the norm being zero. Our o2 sensor is probably a single wire, so it probably takes a little bit for it to warm up really really slow data response, but i just kind of i'm just going to go through and poke here.

There's not a lot of data. So there's not a ton of things to look at. I would think map voltage would be a little bit lower than that, but this is pretty much all. There is to look at not a lot to look at here.

Folks, it's back in open loop, i'm gon na. Let it warm up and we're gon na get a baseline and we'll go for a rip. Well, it's been just a few minutes here, but i think i'm thinking this o2 sensor is better than dead um. How do we speed up this scale here? Well, we'll look here, maybe push the scale button.

I don't know, maybe push the plus button there. We go we'll speed her up a little we're even holding the rpms up. I mean you can see it's just staying dead like i say it's probably just a single wire, but i would think that would heat up by now, even though it's still an open loop, i still would expect you know giving us some beans for that o2 sensor To come to life, but it does say it's running lean uh. Well, i mean obviously because the o2 sensor is below 450, which is kind of weird.

I wonder if we just got a big old giant vacuum leak. That's what's causing his fast idle and erratic running uh. I guess he did. The uh did the fuel pump and all that stuff.

Already too, i think he's changed all the parts he could change, perhaps even an o2 sensor. I don't remember him saying that, but that's usually first on the list of drivability complaints for people before we even go for a rip. I see that we can't even hit closed loop and the o2 sensor appears to be just flat line and even, if we're giving it some beans we're going to give her some juice, i want to see if the o2 even has the ability to respond. So we're going to kind of force a rich condition and i don't even see the o2 sensor button, but we've induced the super rich condition and that o2 is not even moving at all.

So that's interesting um. Let me shut it off, so that gives me some concern right from the get-go. Oh man does that bring back memories right there or what boys huh. I just want to drive around and be a jerk now, ah good old days, um being that our o2 sensor doesn't even seem responsive and that's going to be a key player in an old uh system like this.

As far as one of the feedback sensors - let's find it. Let's just do a bypass test on the wire, because it should be just a single wire sensor. I'm assuming there may be three wires. I don't know where it is, but we'll find it rest assured and uh check out that circuit first and then we'll go from there.

What would you have a look at this philly dude she's mint, i mean yeah. It's got some wiring issues and things like that. But this thing's nicer than most 2018s. I work on rust, wise uh, yeah she's, pretty clean, except for this i think that's the og uh, probably not a lot of sense and tests in this thing and there's probably good reason why this wasn't replaced or loaded into the magazine of the cannon.

So i guess first things. First, i see the wires all melted on her. I wonder if it became a ground at some point and or it became something like this. Let's see.

Does that make sense that makes sense. Hopefully it didn't become part of a ground circuit when they put an engine in and forgot the ground. Hopefully it's not the case um. I guess what we could do.

That is all melted. Let's see if she got some wires hanging down over here. It's got a few bypasses on it. I call it got the vacuum vacuum hose bypass action, uh about a one out of 100 chance of getting that out of there.

Is that any uh? That's not a defouler is that's part of that. Well, let me see if somebody's got one of these old, single wire, jobbies and we'll do some praying, let's see if we can get that out a little harder to locate that than i thought, uh napper uh, both of them uh near us, did not have them. Uh, the fast freddies parts store a huge part store, didn't have one uh the advance auto. Well, they had two: what's it mean kitty kitty? Do you wan na go inside luna, come on come on kitty, kitty mommy come here place your butts uh about a 99.69 chance she's, probably not going to come loose we'll get up on there, give her a couple thumps thinking.

Maybe then we're going to give her a little bit of a push, nothing there um. I wonder if we should throw a little heat on it. Tell you what you stand by. I, like the impacting action, mostly so we're gon na try this again little steady, pushing now.

I think, she's going to fold the pipe up in a bunch of pieces. If we do that again, let's uh heat a little, i do have a plan b. I don't really want to use it, though didn't even make it to 10 o'clock in the morning. Did we firing up the torch first day back after memorial day, so we're just going to go around and just just tickle this thing with a torch.

She does feel pretty thin. Oh yeah, we got a glower, oh baby must be. She grew a little because the wrench is a little snug. Now i probably should switch sizes.

Now this is moving. That's good right! I went and grabbed me a 7 8 socket. 7. 8 is slightly bigger than a 22.

look at that stand back folk because this thing's going to fall out now hey what's up. Miss, though, is this: is it anybody important if i was available, did you say no he's married? Thank you. You didn't. You didn't tell him that okay, i want to dude.

Oh okay, whoa there. It is. Oh, she just broke folks he's a two-piecer now, so i'm just turning the 18 mil thread chaser down through there. Now.

I just want to make sure when we get the new one. The bungs are in a little better shape than i thought so what i did for plan b there we go. That's working pretty well uh. I ordered a uh, a d fouler too.

You know one of the fix, my caliber converter type d followers, because i figured if this thing was smoked. We could at least take a default or cut the bottom off it and uh cut this bung out weld in a new one, but we don't have to now. So there we go. It's just a uh.

You know thread chaser there there. She is look at that. Like a we'll glove, it a little bit of a snug and then find the plugger here, we'll probably zip tie it up out of the way, probably means we will we're going to just take a wire tie up here. Actually, there's a little wire holder right there, we're just clipping into we just want to keep it from getting all burned up again.

Actually we probably should zip tie it such a classic, sound the zip tie. So does that mean we fixed it? No, it doesn't uh truth be told we didn't even do a bypass test on it, so we don't even know if we're right. However, i've got a pretty good hunch and if i'm wrong, i'll eat the o2 sensor, but we need to have a good uh feedback signal from the o2 sensor to determine you know any other issues. So that's one of the big key players in this car shoe fly um pretty primitive system, but that needs to function.

You know i just saw this thing. Let me guess: there's probably no backlash, let's see, yep no backlighting, but who needs backlighting. When you got one of these little guys, let's see, does it work boom? You don't need to know how fast you're going you got. One of those am i right, no problems.

Folks, just solutions: okay, we're gon na go back to data, we'll see if the o2 is working now already looking a little better here. Isn't it so we're gon na want? Let's see, let's just go to cut, let me get a custom display for us, so we've got our block, learn which is like your long term, your integrator, which is like your short term. I could be wrong on all that and then we have our o2. Our open closed loop, our coolant temp, i'm going to let it warm up here for a little bit and see if our o2 comes to life, i'm just holding the rpms up here, letting it warm up, and we can see that such are starting to heat up.

Okay, now we hit closed loop. We should start seeing some switching, albeit slow, because i mean these things like communicate at a certain speed. I don't even know what their baud rate is, but trust me it's slow, so we're not going to get like this beautiful. You know rich to lean transition that we're used to seeing at least on uh processed data.

We won't see it, but we should be able to see it over here. You know we see our rich to lean switch. Oh we got some smoke coming up over. Here.

Must be the panther pee we sprayed on it cool so now that we have a good feedback sensor, our o2 sensor is functioning and letting us know what's going on there, letting the pcm know what's going on, so it can make its adjustments uh. I think at this point just looking at our fuel trims um at this point, i could take it for a little shake now. He said he do have to drive this thing for some time. He said about 20 minutes before it would carry on and and do its thing that it does where the idle would go.

Super super high. It would stall just really run like garbage this probably fixed it uh. At least we fixed a problem. So i'm going to do that.

I don't have my tripod with me, but i'll go for about a 20 minute rip here. Um! It's 206 on this clock! It's a 1030 irl right! 10. 23.! So i'm gon na go for rip. I'm gon na tell you what she's one smooth driving truck uh for an oldie appears to be working, just fantastic uh.

So far, all right, we're idling at about a thousand between 950 and a thousand, it's bouncing um staining clothes come on guy, um, yeah. Everything seems to be working fine and uh. It's 2 15 on this block. So i don't know when we left.

I got a short memory like that, but so far so good i'd say all right. So it's doing what he says he did uh see it's. 2. 19 on that clock, it's still in closed loop.

We still have good feedback pretty interesting, okay. Well, we have a good o2 sensor now, but the car still broke. So what i'm thinking i'm thinking he had had or has two problems. Uh, the running like garbage problem was likely a result of the poor uh oxygen sensor.

The non-functioning o2 sensor we're we got the cruise on right now at 40. um, and i believe his high idle problem is - is a separate problem which appears to be something with the iac circuit, whether the computer is bad or the idle air control valve is bad. I don't know yet, but that's what we're going to find out, because he did say once it started doing this: it would run real poorly, which it doesn't seem to run bad. It just has a really really fast item, so we're cruising back into town here.

It is running poorly and when i look at data, it appears to be running super lean, especially at full throttle, but there's a lot of other weird stuff. The coolant temp sensor is now stuck at 122.. The map sensor voltage goes to zero and then to four and then back to zero. There's some weird things happening.

It's really acting like a you know, a pcm, that's failing, but uh, let's go back and see. Maybe this thing has a bunch of problems. Perhaps oh yeah come on baby. I don't know if we're gon na make it okay, we just made it and it just died.

That's some good luck! Right! There, boys, that's weird o2 sensor is pegged out. It says it's running lean. Well now it says: rich, open, loop, idling super high low battery. Yes huh, i don't know how much of this data i can believe.

Like i say when i was driving the map sensor would do that it would go right to zero. The coolant temp would go to 300 and something okay. I need to turn the camera off here. Tps is at zero yeah.

This is starting to look more and more like a pcm, that's getting overheated so there. I wanted to explain to you what i was doing there folks but uh desperate times i wanted to check. It was still broke so quickly. I did a voltage drop test, uh make sure the engine wasn't losing the ground, and that was good check for ac ripple from the alternator.

That was good and while it was still broke. One thing we observed is that the map sensor was reading zero volts and i tried to show you that on the scan tool, so i quickly just back probed into the signal wire i went down through this um checked. Did i have five volts to have a ground? What's my signal left it in the signal wire and you could see it was reading pretty steady at 1.45 volts. But when we looked over here on scan data oftentimes, it was just at zero.

So and the tps was at zero. Also, i wasn't able to probe that quickly. Oh okay, you can see it's got a new idler control valve um, i'm thinking we have a bad pcm uh. I don't even know where it is or what it looks like.

But it's bad, i think maybe it could be mike. Apparently the pcm lives under here i see somebody's already had this pulled down. There's only looks like a couple screws there that hold it in. So i grabbed just a seven and an eight looks like she's.

The seven variety so we'll get this thing taken out the rest way see if we can find the pcm and then i don't know what we'll do something i'll trick. My grandmother, tommy. We took this baby out. What's up miss zoe, we on facebook huh, we interrupting you.

We need to borrow your freezer. Well, there's the answer right there, i'm looking for just need some love, we'll be right back you wan na, don't forget to go hug it out. No, we need to stick. Can you make some room for us we're gon na stick the old pcm in the freezer, uh she's, pretty toasty right now we're gon na cool it down see if it fixes it.

It's gon na be easier than circuit testing. Can you put it in here please wherever you'd like it and then what's that gon na prove eric okay, the time has just passed. Well, what we're gon na do is we're gon na put it in if it runs great, we're gon na be like oh wow, runs great and then we're gon na get we're just gon na leave it idling over here in the shop and we're gon na get The the blow dryer and uh see what time it is. You know what time it is.

It's. 11 16.. It's almost time for some risky sandwiches. I know man, i think our other video we did there um.

We made some ribs uh. We smoked a brisket, not like smoked a brisket like that in a pit barrel cooker, but not a sponge. Would you even think that i would do it? Why do you think you had to clarify fat because i don't know maybe there's people out there, smoking briskets? Maybe that's what they call it nowadays. You know: hey man, you got some brisket wow.

You know, i don't know what kids do nowadays, but uh we smoked some brisket. Let me tell you what boys we did. Brisket you're gon na have to work after you eat today. I know we made some homemade onion rings and then kaiser buns, with some sesame seeds toasted a little garlic butter, fresh brisket off the point juicy fat, greasy amazing and then layered that up boom couple of onion rings boom.

Some fresh cut, dill pickles boom, some kansas city style, barbecue sauce - i didn't smoke - hardly keep my eyes open after we ate that yesterday. So great uh can we eat early. So i can take a nap. I vote.

I vote yes for eating early, but that stuff should be illegal. We just got into the barbecue scene, and i tell you what, when i eat it, i get to like six or eight ribs, not racks and ribs, six or eight ribs, and i'm just like. I think i think i'm gon na die my heart races. I sweat your skin feels greasy and then you keep coming back and you're just like i'm, never gon na.

Do this again, eight hours later, what are you doing exactly? You know what i'm saying. Isn't it great yeah? You said you were going to skip breakfast this morning because you're having brisket for lunch, i did. I had two piece: toasts both didn't eat breakfast thanksgiving breakfast. Yes, it is, and now i have one donut, okay yep pretty much pretty much didn't have materials.

I think it would have been better all right, we're out of here all right, we'll miss those prepared lunch, she's cold. Now to the point she's frosting over. I don't know if it's cold on the inside, but she's cold on the outside assume it's cold in there, let's plug it in let's see if we got lucky, let's see. Oh look at that it runs normal.

Now, let's go get some data. I really dislike these videos where i'm holding the camera, because i tend to do this like oh yeah, so we're gon na look at this right here and i'm not looking at the camera. Okay, let's see we're an open loop. I let it run here for a little bit.

Uh, let's see coolant's back to normal, that's not stuck at 122. little battery says no map voltage is that where it should be not stuck at zero? Okay, i'm gon na. Let it run for a little bit and i think we'll go get the heat gun and we'll uh. Give that a little bit of heat and see if it screws up just sitting here.

Oh she's, pretty hot for the sucks boys, yeah she's, she's, toasty um, the old con air off here and she's, pretty hot gauzer, um stupid thing hasn't missed a beat. Everything seems to be function. Finally, a control valve o2 sensor throttle position. Pretty interesting.

Um could be a pin fitment, we had you know you never know. I just took an unplugger, it is the og. It looks like you know it doesn't have any remand stickers or anything on it. It's quite hot to touch right now.

I would think the circuit board in there would be good warmed up. I suppose we could take the lid off for the prime chip and blow some heat directly on it, but i would think it would be. It would be hot right now interesting, interesting, interesting. What we could do if we still suspect that we could go down to the uh arrow mark there hit the gas station, get a bag of ice and put it on ice in the words of the beastie boys, because right now it's running like a champ.

So either a were wrong or b. We had a pin, fitment problem and we fixed it, which would be kind of bizarre. In my opinion, one thing i'm going to do is eat some brisket sandwich. Think about working again because the other variable is, you know the hood's up, so there could be something under the hood.

That's getting smoking hot, but i can't think of anything under the hood that was going to go wrong. That would have affected so many different things. Like the coolant temp sensor, the throttle position, the map sensor, the idle air control, everything was acting really silly. The only thing i could think was just the engine ground, ac voltage by the alternator, which clearly wasn't the case.

That's why i checked that initially. So i'm still really leaning towards this little fella. I remember working on early gm's way back in the day, and this was a kind of a classic symptom, but i'm going back years folks years, i provided you a way to cheat. It didn't really work.

Oh, it didn't yeah, no, not like you think it would. Oh in my mind, it worked well. Well, that's it there's a lot of things going on in your mind that don't always happen in real life. Yeah like when i tried to toe some buns yesterday.

Remember what happened small flames, minor fire they're a little on the black side? Okay, oh these pickles are the bomb. I don't know if people say that now, but if you can get them at your local grocery, the gilios grillos, whatever you want to call them. Reloads, fantastic on the microwave, the microwave, the microwave there's, the maintenance wow. Is that what they do? What is this? A cooking show yeah, look at that got the smoke ring.

Okay, that's the pink. Just a light smoke ring homemade onion rings with planko. Oh, this is out mrs zoe's homemade, broccoli, salad and your mother's potato salad. What's this, what what is this that one's mine you're going easy on yourself? No, i'm i'm eating like deconstructed, oh wow, a deconstructed sandwich and who? Oh this, is your mom's potato salad boom? What are you putting on there? Oh texas who's eating the wheat sauce.

Oh my daughter, oh my gosh. This is so good poor josh. He isn't going to be worth some beans after he eats this lunch. What does he care he's stuck in spain? That's true! That's true: let's see what the finished product looks like.

I don't miss it all, but it looks so yummy they are so yummy. Okay, i'm gon na go prepare myself for some food coma. You got all your work done. Almost we got one left, i'm gon na.

Go loosen up my because you have no buckle, you don't get pain. If you don't do it. That's true, thanks for being so good to us that way. Thanks babe love, you hey! We love you too.

All of us 407 on that clock. I don't know why. We need to know that, but we do uh. The lunch is over, i'm worthless, i'm gon na take it for a shakedown.

We're gon na leave the pcm out here and see if it acts up at all, and i'm just gon na keep some data up there. A pretty tough video to record we're just running the same route so far, so good. Now we're just about to the area where it goofed up before it was shortly passed past the construction zone - here, maybe another mile or so, and then it started acting silly uh. But so far so good, i know you guys probably can't see anything there, but everything appears just fine idle's good high tps everything else.

It's fancy so we'll see here in just a minute or so so i'm at the same spot, where we pulled over before everything seems to be functioning as it should uh. The only difference is we have the pcm laid out on the floor. Looking at the data everything's working good o2 switching tps is staying steady. The map sensor is not dropping out to the zero volts or the coolant sensor, the tps everything that was going kind of stupid before um.

I'll be honest. We have worked on enough of these old ones. You know way back in the day when i was just a young buck. This was a pretty common symptom that you would see not you know so much on the s10s, but just gm's in general, when the pcms would fail and the data would just go haywire.

You know i was like none of this is making sense. I'm feeling pretty confident, saying hey, you know you should probably put a uh. You know put a pcm in this thing, they're pretty inexpensive too, so that would probably be the cheapest uh. You know best educated assessment that i can offer him uh, based on the data that we've collected and and what we've seen so far uh.

Nothing else really makes sense. Obviously, i'm gon na go power. Some grounds make sure that's all good, but other than that. I think that's where we're heading with this thing, i don't think we're gon na make it back boys, not this time, baby awesome, but i don't like it stuck in the intersection.

So let's uh pull over here now that it's a busy intersection but yeah. So now it's really yeah. It's really goofed up right now you can see the map sensors, cutting in and out low battery. Yes, we've got every all the i'm just gon na scroll through my list here, real quick, but we've got all the telltale signs here.

You know the battery's obviously not low, because we've already checked that our coolant sensor, screwed up high act position is not for real tps is sitting at zero. I don't know if our o2 reading is good or not. You know the integrator and the black learner, both at 128, but it does say, open loop. I guess we might be able to make it back but yeah.

The map sensor will, you know, keeps going to zero volts, pretty continually looking like a pewter boys. Well, we're making it pretty pretty. It got her down in the number four and i'm just letting it idle, because we can't give it any throttle or it's gon na die on us, we're almost there yeah even keon engine off, it's still going kind of wonky there. As you can tell so that tells us, it has nothing to do with charging voltage has nothing to do with.

You know ac input from the alternator. Our throttle position sensor is still sitting at zero and i guess what we can do being that it's broke key on engine office. Do some tests right at the pcm, so let me grab some wiring diagrams and we can verify you know. What's the map doing? What's the throttle position doing um, you know where's the coolant sensor sitting.

You know all that stuff can be measured. You know right at the pcm shows our battery voltage is zero, which is weird you know. So we can do. Oh now, the batteries back to 12.9.

So maybe that's also doing the zero thing: um yeah it is okay, gotcha, so yeah. So this is all stuff that we can check, but uh definitely leaning on that bad pcm. So i've left the key on. I left our battery voltage up here and the map voltage.

I did get us a diagram, she's kind of old school. We got no color on it and we're gon na need a magnifying glass to see it. So we've got that uh. I think what i'll do? First thing first is we'll find the map sensor i'll see if i can find where that goes on here, we'll back for a bit and also find the voltage supplies and stuff and if both of those are steady, but the scan data is still screwed up and The car is still screwed up, then i'm not going to bother testing everything else.

That's not functioning, so let me figure this out i'll find out where everything is and then we'll uh do some simple checks. There we go map sensor in reference voltage. I get the right pins here, so this should be our power, so i'm just going to probe into that d1s over here there we go nice and bright light there pulling pulling a couple amps off that, so we're we're satisfied with that scan data is still goofed Up still toggling, you know between zero and i'll, wait for it to pop up here, 12.7 volts. So there's our one battery voltage and then there's another ground on d6, which is supposed to be tan, which is if this is the one.

Two three and that's d: nice, three, four, five six! So this is another ground right here, so i'm gon na probe into that one, and you can see we got a nice bright light there. If i can find the hole baby there, she is so we've got good ground there. Also. I think that is the only powers and grounds on that connector.

Let me just double check, so that's ground one ground two battery and that's it there and we've got another ground on the small connector black with red on b3. So that's this ground right here. We probe it nice and bright light. So that's good! Let's find if there's anything else, i don't see any other grounds there.

So those are the three grounds and then we do have another battery which is orange on b1, which is going to be this little fella right here and then we'll go back to that ground. That we just checked, we know it's good. If i can find it and there it is, and we have a nice bright light. So we have uh.

It appears that we have all of our powers and grounds, and then we have a memory power which i don't think we're super concerned with uh and there's another ground red black red white: a12, black with white 812. So that's going to be this pin right here. This very last one, so we will check that very last ground by going like this and then we'll probe the known good power that we have we'll probe it with our high amperage side. Here, there's that and nice spray there there.

So that should be all the powers and grounds. Let me find the map signal here, standby folks get to talk to mrs over there for a second okay. Let's find the map and uh, let's see, map in c11 light green, it's gon na be on the big connector we got. Some is this number 11, so we got 16 15, which is empty.

14. 13. 12. 11..

I think it's this one here, just double check, that is that number 11.. That should be number 11.. So now, now that we know our grounds are good, we can use one of the grounds right yeah. Actually i think there may even be a signal.

There may be a sensor ground here. Let me just check this here folks, i thought i saw ground reference voltage. Dpsn, okay, so we're going to use one of our grounds uh this black with white here was a ground, so we will ground into it. I just want to make sure on skin.

Did everything still screwed up and it is so we're going to ground into that? And then we're going to check the 5 volt supply, which should be this gray wire. That's 5 volts. So i know you guys can't see it here, but we have a steady 5 volts now this 5 volts feeds the tps and it feeds the map. So that tells me like: hey fella, we're good, i'm gon na probe number 11 here, which was light green and we have 4.63 volts on scan data.

Now i got ta remind myself what light green was. I know we were going for it, which was uh pin c11, which is map sensor in on our scan data. You can see our map sensor is going crazy, still up down up down, but on an irl. You can see we're at 4.63 as far as actually making it to the computer, and we have a steady 5 volts there, which is good and then, let's just check one other thing here.

So there's really not not much sense of checking anything else. Um and our purple wire - let's just see where that goes center return, is in the other connector a11 and it's purple a11. That's right! Next to the ground that we're plugged into we're going to plug into the actual center ground and make sure that it's nice and steady typically, if you would have lost the sensor ground or a center return as they called on this, your voltage would go high. It wouldn't go low, so right now we're plugged into the map sensor, uh, ground wire and the signal wire and kion engine off we're at 4.63, which would be barometric pressure, which is good, although on scan data, it's going stupid uh.

Therefore, that tells us that the pcm is junk. There is one other thing i think i wanted to check here. We did the grounds we did the battery the reference voltage, the other ground. We did that battery yeah.

The only one we didn't check is the memory memory power uh, which is a6 and um - that's pink with black a6, which is pink with black right here uh. We can do that real, quick, like a bunny. It's not really gon na be a make or break a deal here and we'll probe into the ground. That's black with white ground, and we can see our our cam power.

Keep live. Power is good. So there's really nothing more to see here. Folks, um, oh wow! It's saying oops, you just missed it.

It was just saying that our battery voltage was 25 volts just moment moments ago. There it is 25.5 volts is what the battery voltage is so something's. Definitely wonky inside of here. Maybe we'll give her some of these hey, give it give it a sniff.

But honestly all it smells like in here is mouse piss and cinnamon, but uh yeah. The voltage is all screwed up now on here and all the other sensors keep switching to zero so and our rpms are 1 900, pretty good cool, it's still at 122.. We can make sure i don't know if by tweaking on the circuit board here, if it'll correct things or not, it doesn't really seem to be changing how the map is reading or the battery voltage for that matter. Even if i play with the connectors, it still seems pretty repetitious.

That's the only thing we can do is throw it back in the freezer, but at this point i'm gon na make the call it needs a pcm see if he wants to fix it. So the big dilemma here is uh. How do you know it's the pcm and not the prom in the pcm well and asked me that question okay, you just asked me a question. I don't know i'm not a genius.

I think the man brisket. I think the the best solution here would be is the whole hold of one stone, kill the two birds thing, and by that i mean, can we find a used pc, i'm getting a prom chip, for this is out of the question. The pcm, i believe, is mostly just the hardware, the prom chip, i believe, stores. You know the the data, the software for the hardware.

You know which one of them is going wonky. Well, we can handle a couple ways which may we you know we could get the pcm from uh napa uh, who doesn't sponsor us uh they could get it for us. Kansas is playing. I got some dust in the wind crank.

I don't want to get demonetized um, so we could get the pcm from them. We could put it in put the prompt chip in with the possibility of having the same problem you're. Second, guessing yourself, you don't know what to do or we could try to source a used, pcm and hopefully have the same prom prom in it, and either have a different problem or cure the whole problem that we have together. If that makes sense finding stuff for vehicles this hold around here is pretty tricky uh.

These things have long bent since been in the crusher. I mean this. Is these things have been gone for 20 years since we've seen cars like this. So let me do some looking i'll see what i'm gon na do.

You guys are gon na have to stick around because it could be some time before we get something uh. That's all i got ta say to you so we'll end it right here. This will be part one of the chevrolet s10. It says tahoe on the dash chevy s10 tahoe, i'm like a dog that gets distracted, easily uh, so that'll be it for the 1988 chevrolet, it's the s10.

The two eight you guys know what to do. Comment sections questions concerns instead. Facebook just remember viewers. If i can do it, you can do it.

Thanks for watching y'all, i ain't going to believe this wilfred you pulled a bath had a pcm out of a 1991 chevrolet. It was a blazer, but it was a 4-3 correct hardware, incorrect uh, prom chip. So i took the this: is our og pop the prom and maybe knock information off this one? I don't know what the other module is or before my times, folks swapped him over. The hardware, though, is different, so now we got ta, take it for a shakedown and see do we have the same problem, or at least maybe a different problem, or is the problem fixed? What are the freaking odds of that? Am i right my guy 1991 blazer down there stripped from one end to the next, but i had the pcm in it? Oh and i stole some stuff.

I stole two of the screws that hold the little plastic thing on underneath. So we can put this guy's plastic thing back where it belongs. Let's ride, i don't know if you can hear me, but while i'm driving along i'm just looking at the map center, so i just picked one of the sensors that starts going crazy. That way, i can just have a little look-see over.

There tried to pull over here in the shade, so you guys could see what i'm seeing but, like i say so far so good and we've certainly have never made it from this area of our test. Drive back to the shop, so i'm gon na stay here for about another minute and then peel out. Well, we made it back to the construction zone, no problems. I think we might have got it folks.

This is farther than we've ever gone before. I think we have success fellas. Oh you can't see crap anyways wait till we get back to the shop, but she ain't skipping the beat she's running steady, my guy all right, perfect uh. We went all the way we did our full route that we've done before and and this time we made it back alive and we didn't do any of the skipping and bucking and dying halfway back or where we turned around, and i pulled over again just let It kind of i don't just really heat soak nothing's changed much today as it's gotten progressively later in the day as it does each and every day, as you know, the world turns - and time goes on - it's gotten hotter, it's about 90 out today.

It's it's smoking. Hot, so everything under the hood that we haven't touched, there's no variables out there that we have to worry about. This is the only thing we've meddled uh with and it's what i first suspected right from the get-go after we had a working o2 sensor uh. So that's there's really nothing more to see.

We proved it out with uh just using our meter and looking at scan data, seeing what the computer is seeing. Uh there's, probably some kind of voltage regulator in there that's going. Wonky is my assumption. The way it was turning on and off a lot of you, electronics guys will probably know what's happening there, i'm not an electronics guy.

When it comes to that kind of stuff, i can tell you yeah: the box is bad, i'm not going to tell you what's in the box, that's bad um, but that's that so anyhow. So much for part. Two thanks to wilbert's, you pulled a bath for not sponsoring us and for having a 1991 blazer down there. What the heck! Why is that? Still there? I don't know, maybe we're just living right folks, so we'll catch you around! Hey.

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