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Old 08-22-2017, 10:35 PM   #18
Terry Kennedy
There and back again
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Join Date: Oct 2003
Carmudgeonly Ride: 2003 BMW 325xiT; looking for a new fun car
Location: New York
Posts: 2,566
Originally Posted by equ View Post
On the 535i a CEL that keeps coming back (and this time here to stay) seems to be due to a weakening coil (car still gets 27mpg) highway. Perhaps this coil is the reason for a shaky idle. I'm not sure.
If using BMW replacement parts, make sure it is the "coil of the month" - BMW can't make up their mind which manufacturer they dislike least. Currently they are using Delphi coils. Here's the complete supersession history:

Note: The part number carries a precaution that it contains hexahydro-4-methylphthalic anhydride which is apparently Not Good For You. This is a BMW AG warning, not a California Prop. 65 one, so possibly for real. Do not eat.
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