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Re: Jekyll and Hyde driveabilty - or am I nuts? (archive)
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Posted by Neil Deshpande on November 03, 2001 at 23:17:39:

In Reply to: Jekyll and Hyde driveabilty - or am I nuts? posted by Todd Kenyon on November 03, 2001 at 20:30:18:

Todd:

Have you checked the ignition coil? A friend of mine reported stumbling acceleration on his 91 E34 M5 and it turned out to be the ignition coil. All tests checked out, but it was bad somehow.

Not sure why it all becomes OK when the car is warm. Perhaps the coolant temp sensor leans out the mixture as the engine warms and the leaner mixture is easier to ignite? I have little experience with this sort of problem so that is the best guess I can come up with.

One way to do this would be to measure the resistance of the coolant sensor when it is hot and putting an equivalent resistance into the circuit, removing the coolant temp sensor, and then running the car from cold.

Neil Deshpande
http://www.neilwerke.com

***


I've had a cold driveabilty issue for a while, (88 M5 w/ 82k) drives like crap (hesitates, lurches, occasional backfire) when stone cold, then runs fine when O2 sensor kicks in.



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