Hey there viewers and welcome back to the south natal channel. That's the 2011 cadillac, it's the srx! It's got the big 3-0 uh. The guy tells me the money light is on. His wife tells him that it starts hard when it's cold out and runs poorly, so started up brought it in the shop.

Of course, the vehicle's already warmed up got just dropped it off. It runs. Okay started: okay had a little bit of a weird time, starting just a slight extended crank and then a little stumble and a flutter. And then it idles yeah, okay, no dead mist, but you could tell it's not idling quite correctly, so we're gon na hook.

The all tail to it uh pull codes out of it and see if that gives us some direction and see if everything all goes together, we just did a full system scan, so we're gon na go to the report, see if this makes sense. Fuel system, rich bank one and then a misfire, and then i got some abs codes in it all right. So now this stuff really matters except for the engine light uh. So it's interesting that it's running rich, not too often vehicles run rich.

I don't know if this is a flex fuel. You know if it's like an alcohol reset deal, don't work out a lot of caddies myself, but let's see here rich richard tricks for treats rich, everybody's rich and then a misfire. So let's look at our freeze frame data. You would think if it was running super rich.

It wouldn't start too bad when it was cold, but maybe it's like really rich and flooding. Let's see here yeah, so the fuel trim is only on one bank, so bank one it's taking away lots of fuel bank two uh total trims, not too awful bad, so that probably does away with our theory of of running rich because of alcohol. I don't know. I wonder if this engine is, if it's a gdi engine, i don't really know right off hand, but we possibly could have a you know bad fuel injector on that bank.

Perhaps so, let's go just for grins and giggles. Let's look at live data because i don't know right offhand if it is gdi, let's see if your alcohol content is at zero, it says: let's see if we have a high pressure, so we have fuel rail pressure. I wonder: let's uh, let me get a hose on this thing or not. I can't get a hose on because it's got big stupid.

Looking exhaust tips, however, it is direct injection according to this and, as you can feel, the engines form i just shut it off. A few minutes ago, so our theory, i'm bringing you along with me in case in case i'm wrong. So i can say it's ours. Our theory of potentially leaking injector is probably quite plausible, because if this fuel rail pressure pit right here is the high pressure pump, then it should still be in the thousand psi range right now we can see it's at zero.

Let me grab my let's tripod. If that makes sense to the um, you know, if you think about this, like a uh like our evap system, when we take our evap system, we close the canister vent valve. We close the purge valve where you take your gas, can that you know that has a half tank of fuel or half tank of gas and you got two and a half gallons in a five gallon container and you stick it out in the sun and it's Completely sealed up it blows up and swells up because it starts to build pressure. Well, a gdi system will do the same thing when you shut the car off it shuts off, there's still fuel contained in the high pressure system and as the engine heat soaks into it.

It'll go from a thousand pounds to you know two three thousand pounds of pressure until it hits its. You know relief. So that's, usually a quick and dirty way to tell is there a leak in my high pressure system is shut. The car off then go key on engine off and you should see a rise in fuel pressure as it heat, soaks um.

What i want to do or what my intention is here i might have to go, get mrs oak, because i can't smell to see if there's a bunch of gas in her oil, which i think that would affect two banks more than it would affect one bank. I'm just starting to get a little bit of my smeller back. Let's see if it's way over full and it's not so that's good we're below the uh we're below the full mark. So it's likely not.

You know a high pressure pump dumping a bunch of fuel uh in the engine. So let's probably what we should do is check the service voltage first and see if there's a bolting out from gm. But let's start it. Let's look at our fuel rail pressure.

Uh data pin see if it you know, goes up to the five six hundred pounds at an idle, perhaps and then see if it drops off immediately after we shut it off. That's what we're gon na do. Okay, let's see yeah, so you can see it had that kind of a funky start: okay, we're idling about 300 psi. Okay, i'm going to shut the key off and then i'll go key on, but i don't even have to yeah.

You can see it's starting to drop immediately, so that indicates to me that we do have a leak in the high pressure system, so i've got the key back on. So, let's see so that's the data we gather. We know it's running rich and we know we're losing high pressure fuel, so we likely have a bad injector. As my assumption, i don't know if, if we go into the tests fuel injector balance, what do we? How do we want to do this? I wonder if we're getting a misfire, perhaps on a single cylinder - hmm, let's see, what's going to be our next step, so i went into the cylinder power balance menu and immediately when i started it.

Cylinder 5 started having counters and that was on immediately on startup. So i'm wondering if that cylinder is flooded, so let's do this again. Let's let me shut this off. Let me back out of here we're going to let that fuel pressure drop so essentially it should be.

If it is in a cylinder, it should be flooding the cylinder. Currently, that's my thought here. Try to get this stinking push buttons, get these keys to turn back on gm. You have to push and hold there.

It goes it's back on, let's see here, so we're going to go back into the cylinder power balance. I just want to see if that's consistent, so it's going to show misses. It shows miss on one three and five, which are all on bank one, i'm assuming and one and three are likely misfiring because they're running so lean. My assumption is, or my hypothesis is, that cylinder five is the one with the bad fuel injector and that makes that entire bank run super rich.

So the computer cuts fuel from that entire bank in turn, making one and three run lean and misfire when cylinder. Five is actually uh the little guy at fault here, so i think we're gon na have probably enough data to go with this. So, let's take i'm gon na we're gon na fire it up now, i'm assuming that number five is flooded out right now and is what causes the you know causes the quick count on number five until it hits closed loop? That's my guess! That's something that makes sense to me and then looking at the history that makes sense to me also so uh. Now what i'm going to this fuel injector balance menu see.

So i went into this fuel injector balance menu. Now i haven't looked in service data to see what this is uh. Let's fire up, the engine hit continue uh, let's see, oh okay, so this is going to do our injector balance like it used to with the using a manual gauge under the hood. So let's do cylinder one 58 psi drop cylinder.

Two cylinder three cylinder, four, our suspect bad one. 61.. 64.. So i don't see any we'd have to look in service data to see what the theory is and how it how it tests these, because that's kind of peculiar we know we have a pressure loss because we saw it in live data.

I think we might be up to creek folks, because i think that you need to pull the intake perhaps on these to pull plugs from me, man, god. I love my chevrolet there we go yeah. You know that baby's getting checked take off the old oil cat, easy peasy mm-hmm. I don't think we can do anything.

Let's stick this down before we drop jump in the hole, doesn't really fit well, we'll just leave it on there to plug, though, because we're going to force that back in there don't oh yeah, no, you know what we might actually be able to get to number Five cool so we're gon na pull this rear coil out. What i hope to see is, i hope, to see a completely washed out cylinder. I think we got pretty lucky being this one. Well, we could have been real lucky.

It could have been one of the front cylinders, but this should be bank one back here. This should be the number five cylinder, i'm thinking so unplug the coil and then we'll take the coil out we'll take the spark plug out, and this thing leaks fuel faster though i'm thinking that we can um perhaps just turn the fuel pump on, because i think It even leaked out all the low pressure, the 50, whatever pounds from the low pressure pump. So maybe we can see it just uh right in the cylinder. That's what i'm hoping for here or we could be completely wrong and have to come up with a different hypothesis, but i think we're on the right track.

Anyways, let's try this longer one. Here there we go 10 incher. Everything on this car is pretty dang tight, including the oil cap. I don't know why the gm's here when you got to pull the plastic junk off the engine, you got to take the oil cap off and they set it down inside of a recess.

So it's always full of seeds and dirt. It's kind of a ridiculous design, in my opinion. Well, this spark plug and number five things darker in a pocket, so that sucker is black. I think i can smell gas, oh, but that that spark plug is definitely super.

Black i'd be curious to know. Well, i don't know, but now this other one's under the intake. I think i think it's under the edge there uh. Of course you can't see down in here um.

I wonder if i get our little bore scope back there. If that'll be helpful to us. If we can see in there and uh. Let me try that.

Let me get that thing: fired up, takes a minute or two again about time to get a new uh little scope here folks, so this one's getting pretty cruddy, they get pretty abused in the shop. I just buy these cheapies off the amazon. So, let's see, i can't get it down in the spark plug hole here, move my mouse out of the way. So this is the spark plug hole we're coming down into.

Let's see which way is up here, aimer right down to there. It's not a very high definition, camera that looks like gas on top of a piston to me. We don't have to go very far so that looks like a puddle of gas, i'm going to turn the fuel pump on, so the fuel pump is on right now and the price let me shut this off here pressure is holding steady, wish. We could crank up the high pressure, but i don't think we really need to go any further.

That is obviously gas sitting on top of the piston like no, i mean there's no there's no doubt about that in my mind, because let's see, let's wiggle the car so see how we're wiggling the car, so it's definitely a liquid. On top of the piston uh number, five is our cylinder that has the black followed spark plug. It's also the one that is misfiring on startup, it's running rich on this bank. I don't think we need to go or do anything else at this point.

That's that i think i think the show's over folks, it's all over, so that's that folks definitely needs an injector on the number five cylinder and then you know go from there that should resolve all this problems based on what we see and we're able to kind Of figure that out relatively quickly just looking at scan data coming up with a hypothesis and then you know executing it to see. If that's you know what it was and that's exactly what we thought we might see. So we have to go from there. Unfortunately, to put injectors in these, it's uh a fair amount of a job.

You know it's just a couple hour job, but you need some specialty tools. Uh to do it. You know the pliers to put the retaining ring back on the injector rail. They can be a huge pain in the neck if you try to do it without the pliers and they're a couple hundred dollars for this pair of pliers that installs a clip and the the seal tools that go on the bottom.

I have some of them for gm's i've done some of these in the past, not on these particular engines but uh, some of the three sixes i think we've done and some of the chevy pickups so anyway, whatever you guys had in that comment section the questions, The comments, the instinct, the facebook, you know what to do just my reviewers. If i can do it, you can do it thanks for watching you.