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2011 chevy cruze 6 speed eco

4345 Views 24 Replies 3 Participants Last post by  rnnhoover
U0140, P2227, P2228, P0420, P0299. Ive replaced many parts to include the turbo all the lines coming in and out, rerouted the check valve on the intake manifold, MAF sensor, baro sensor, map sensor, turbo boost sensor and probably more just cant think of any more at the time. I know the P0420 is an exhaust leak/gutted catalytic converter i created when replacing the O2 sensor after the catalytic converter. I gutted the catalytic converter because i thought maybe it was bad then changed the rear O2 sensor and ended up having to cut the exhaust and pull it off to remove the O2 sensor because it wouldnt come out. I pulled the brake booster hose out as well and blew smoke with my vapor cig in there with no visable leaks, dont know if that would replicate a smoke test to the extent it needs to but afterwords pulled the intake hose off and there was smoke in there (so i think it worked) Any questions and ill do what i can to answer them. I will appreciate all the help i can get.
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I wouldn't think the wastegate spring to be bad straight from the factory, though I've seen it before...

I've had the underboost problem before but it went away, and I still have the P0420 and it makes my car run horrible at higher RPMs...

In your case, I would definitely lean towards the bcm or ECU since you changed the baro sensor already and there are two codes for it.

That being said, I feel you have two different issues going on, but it could all be stemming from a bad ECU. Not the gutted cat part, but the underboost and bad barometer readings.

Just my two cents.
 

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I wouldn't think the wastegate spring to be bad straight from the factory, though I've seen it before...

I've had the underboost problem before but it went away, and I still have the P0420 and it makes my car run horrible at higher RPMs...

In your case, I would definitely lean towards the bcm or ECU since you changed the baro sensor already and there are two codes for it.

That being said, I feel you have two different issues going on, but it could all be stemming from a bad ECU. Not the gutted cat part, but the underboost and bad barometer readings.

Just my two cents.
I appreciate the help. Is there anyway to check that spring? Something else i didnt mention is oil in the throttle body, intake manifold etc...
With you having oil going through the system, that can really hurt the cat and cause it to clog and break down, if you don't have it hollowed it... So that might be contributing to P0420.
 

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Oh, and for the wastegate spring, if the car is operating the same since before the turbo swap, I'm fairly confident that those components all work okay. But since you have the old one, you could in theory take that one apart and try to figure it out, then compare if it isn't too invasive?
 

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I will say, I believe the wastegate is spring closed and pneumatically opened. That being said, you can check it with air or by removing it and checking it with a spring scale. Both ways require removal, but that's an easy way. The hard they are to actuate, the more boost. So if there isn't any force to actuating it, it's probably a weak or defective spring.
 

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Hi! I apologize for the super delayed response. no, my lights didn't flicker. So I first tried the O2 sensors with no luck... but then, this morning, I took after the spark plugs, and found one failed. It actually had a large leak so under boost the air/fuel mixture would get all out of whack and run horribly. I also randomly got a #4 cylinder misfire code, which is why I went after it. ugh!!!

Have you had any luck on your end with diagnosing your car?
 
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