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Old 12-03-2012, 11:48 AM   #2
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Join Date: Aug 2006
Location: NJ
Posts: 23,226
My Ride: '99 328i 300K miles
I'm sorry, I'm not clear. Right now you have the codes coming with using Chevron gas?

It could be the MAF should smooth out if you unplug maf. I'd try that first and see what result you get.

If that smooths out the idle, I'd still say it could be a vacuum leak...0-ring/gasket issue...or if you haven't changed fuel filter in forever, that's another reason for lean codes.

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