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Politically Incorrect
Join Date: Aug 2005
Location: Hoover, Alabama
Posts: 1,497
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To cause a lean reading AND unburnt fuel smell symptom, I would suspect an ignition problem. If a cylinder does not fire the unburnt fuel and un-consumed oxygen go out the exhaust resulting in a high hydrocarbon reading AND a lean O2 reading. Also something to consider is a stuck open or not fully closing exhaust valve (maybe a broken valve spring).
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Edek
'87 924S
'91 535i
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