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Old 05-03-2008, 05:03 AM   #4
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froggy81500 is on a distinguished road
Join Date: Apr 2006
Location: Upstate, NY
Posts: 1,435

2006 ION-2 Sedan
Default Re: UN-Modded :) 2006 Ion-2 throwing P0171

Make sure your oil cap is on tight and your dipstick is seated fully. I know it sounds strange, but the ecotec does not use a pcv valve, it purges crankcase pressure internally. If you open the oil cap while the engine is running you will notice the idle fluctuate and you will also hear a sucking sound from the open fill hole. I know this because I just did that the other day and stored the same P0171 code, which is a lean code. Opening the oil cap on a system like this is the same as having a vacuum leak, which would lean out the mix. It could be a bad seal on the cap or stick leaking air also.

And yes the cylinder head would be the equivalent to a bank of cylinders. Obviously on an inline engine there is only one cylinder bank, a V engine would have two banks.
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