Chevy Cruze P0171 Rough Idle. Step By Step. Fixed!

alarm_on02-May-2022

Hello everyone today I would like to, uh, make a video about Chevy crude, um, the car had a rough idle kind of misfiring and rough idling when you come to the traffic stop, what it was in lean condition, which means there was like air fuel mixture, wasn't, right, um. And it had a code for p. 0 1 7. One, I believe if I'm not mistaken system, two lean and bank one system, two lanes since it's, a four-cylinder engine bank. One means the same thing it doesn't have a bank. Two, uh bank. Two is on v6 cars.

Anyway, uh, long. Story short, if you have the same situation and first thing you want to check on these cars is the valve cover gasket. In my case, it was already been replaced how you check it there's, a positive crankcase. I believe, uh diaphragm in here, when you start the car, uh, you put your finger up here, you're going to hear whistling noise from this spot.

And when you put your finger down here, your engine, going to act differently, and you're going to feel like it's sucking air from there in normal condition. No air is. Supposed to go through that hole. And if you see that is normal that's, not the case it has two more PCV valves on this engine. One is down here where this hose goes into the intake and follow the same hose comes down here. That is the second PCB valve.

So this is the hose goes all the way up there and goes in there. So one piece of valve on the intake, one piece of down here. So this is the holes I can show it to you. The adhesive valve is in here as you see it's supposed to let the air go in one. Direction so, um, first, we check this one. If this one is good, you take this hose off while doing that be really careful.

So you don't break this fragile hose air hose. Once you take it out look down from this, uh into the intake, it's built into the intake. So if you see like orange like let's call it nipple, uh, use your flashlight.

Just look down there. If you see orange nipple in there, or maybe it's just dirty, and it looks black, but it's going to be like kind of little thing comes out. So if you see that in. There it's pointing this way, if you put your flashlight, it's going to be you're going to see the point of it in the intake, if that is you see in there, that means your intake is good. If you don't see anything in there, that means it broke off, and you're going to need new intake.

But if that one is good check this hose remove it. And after you remove this, uh, clean. This part, a little with the um with the paper towel, or something then put your mouth in there and blow it, and you're going to see it's. Gonna stop the air it's, not going to let it go it's going to come out this way, it's, not going to go back in there. So if you blow it, and it stops the air going, it stops the air from going into the intake it lets it out, but doesn't, let it go back in.

If is you see you can blow it, you blow the air through this hose. That means this hose is bad. You got to replace it.

Let me show you the uh part number for the for this stuff. And I've already replaced mine. This is the price for it with the tax 8544 from the. Dealer, and this is the part number and anyway. Another thing if you, uh, don't know how to check this one is the same way it's, not gonna supposed to let the air come out like go in. You know, if you blow this intake through this hole, you're, going to try to blow it you're going to see the air is not supposed to go in there, it's supposed to come out from the intake if it goes easily in there into the intake that means that PCB valve is bad in the intake. So you have to replace the intake.

So after I replaced mine, this everything was good, but the rpm was going up and down up and down. So the car, um, kinda learned air lick into the ECM. You know, it kinda made the car running in that way after it replaced it. The car was trying to learn it. You know, so I had to use my scan tool to uh relearn, the idle position after that.

Everything was good. I let the car idle for a little while and everything was good. It didn't shatter. It didn't misfire anything nothing.

So another thing you want to check. If everything is good, you want to check for smoke test and see if there's any air lick let's say from one of these holes, I originally had some air lick from this hose over here. I had to tighten this screw and now there's.

No air, licks air. Leaks can be from here from here, or from your valve cover itself. You know, maybe your gasket is leaking lots of oil.

If you see lots of grease and oil coming down from your valve cover gasket, there's, a possibility that your valve cover gasket is leaking. And and there's the air like into the system so check for those, and hopefully you get to fix your car as I said, I already replaced this hose. I actually, I didn't know about this, and I had to google it and figure it out. Because first, I had a leak from there, and I replaced, I fixed that issue. It fixed some of my problems, but it was still shattering, it wasn't idling properly, and I had to dig and search more, and finally figure out what was the problem. And I also changed the Evan valve that was.

Bad as well. So what I did on this car, I fixed that air leg, I replaced the Evan. I replaced this hose.

This was already replaced and what else I did. Uh, yeah, that was basically I did run smoke tests. It had the air like just in there that was it. And I did re-learn the idling position after that. Everything was fine.

And these are possible causes, uh that you might have with your car possible issues that uh leads you to lean condition and misfiring. Good luck. Thank you.

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