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help with p0171

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i have a 2012 chevy cruze eco, 70K miles. i have replaced the O2 sensors, the MAP sensor, and now the car is still throwing the p0171 code. It all started with the O2 sensors codes then the map sensor was throwing a code. everything i have read points to the pcv valve in the valve cover and replacement of the valve cover. Im about at wits end here throwing parts at this car, has anyone else had this similar issue here? I can also tell you the diaphragm on the valve cover hisses/sucks air a lot, dunno if that is normal never paid any attention to it?

any help please!!!
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so i have replaced the O2 sensors, the MAP sensor, and now the car is still throwing the p0171 code. It all started with the O2 sensors codes then the map sensor was throwing a code. everything i have read points to the pcv valve in the valve cover and replacement of the valve cover. Im about at wits end here throwing parts at this car, has anyone else had this similar issue here? I can also tell you the diaphragm on the valve cover hisses/sucks air a lot, dunno if that is normal never paid any attention to it?

any help please!!!
Easy test - see if it's doing that:


Now that you know about us, don't throw parts at it next time :D
 

· Administrator, Resident Tater Salad
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Powertrain warranty is 5 years/100k from original date of purchase and doesn't matter where YOU bought the car from. Check my.chevrolet.com if you suspect it's still active.

Yep, don't see the check valve there.
 

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It just gets stuck and then sucked in down one of the runners and melted or something. Doesn't seem to cause damage.

Yes, I saw the installation personally on XR's car and know of several others that have been running it for a while now. It's actually mostly hidden from view from the top - very clean.
 

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Do the valve cover as soon as you can.

Do the intake manifold work when you get a chance.

Won't hurt anything, but oil gets sucked through all the turbo plumbing.
 

· Administrator, Resident Tater Salad
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so this may be a dumb question but wont putting the new valve cover on (which should be here tonight) just blow the pcv valve again since i dont have the non return valve repaired?
Not right away. Should be good for a few thousand miles. But left untouched, the valve cover can make the car unpredictable and almost undrivable at its worst.
 
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