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Discussion Starter · #1 ·
Hey all. I'm new to the forum and wondering if anyone has had a similar problem and any possible solutions. I'm stumped. I have a 2011 cruze L4 1.4L turbo ECO manual. Have been having a drivabillity issue lately and it seems my turbo is in mechanical mode. It's been falling on it's face, gutless compared to what it normally is. As I diagnosed it I changed the valve cover and gasket, MAP sensor and MAF sensor as these seemed to be the problem. After the check engine light came back on it shows codes P0171 for fuel trim system lean, P1101 intake air flow system performance and P0106 MAP sensor performance. I'm at a loss and don't want to throw more unnecessary parts at it. Any pointers would be greatly appreciated. Thanks.
Rich
 

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Those codes are usually thrown in conjunction when there is a big vacuum leak, such as the valve cover.

Listen for an obvious hissing from the engine compartment while it's running. Check all of your turbo intercooler hoses - one may have blown off its clamps (this happens at the intercooler itself sometimes).

Your MAP and MAF and O2 sensors are likely fine.
 

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Discussion Starter · #4 ·
I went out and took a look. Didn't see any missing or broken clamps and I couldn't hear air sucking anywhere other than the air intake and the valve.
 

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My guess is your PCV valve has failed. This seems to be the single most common source of the P0171 code in the Cruze.
 

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There's the check valve in the port in the intake manifold that the corrugated hose goes to, and there's the burst disc in the valve cover, which I believe you said you already replaced. The check valve can be a cause of the valve cover PCV disc failing; the valve cover is the one that throws the 3 codes.

An oil cap or loose oil dipstick will do the same thing - basically throwing codes for a vacuum leak. If the valve cover isn't hissing again, hunting it down becomes more tricky.
 

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Discussion Starter · #8 ·
Just replaced the oil cap a week or two ago so it shouldn't be that. I'll have to do some more digging to figure it out. At least now I have a few new leads to follow up on. Thanks all
 

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Discussion Starter · #11 ·
I'll check as soon as the rain let's up. If the ball is not there what so I need to replace? The entire manifold?
 
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