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      12-23-2012, 06:22 AM   #44
orionredwing
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Drives: 335i Sedan, 135i Coupe
Join Date: Dec 2006
Location: San Jose

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2007 335i  [5.00]
My 335i had same symptoms on cold start. If I drove off immediately, no problems, and car smoothens out after it warms up. However, I also was blowing black smoke out of tail pipes on WOT.

Did walnut shell blasting, and replaced all 6 spark plugs. Found plugs 1 to 3 were fouled (black w/ fuel smell). Afterwards, black smoke on WOT is now gone, but cold start issue is still there.

Pretty sure it's my bank 1 injectors. I had those injectors replaced under warranty, but bank 2 is still the original. Go figure.
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