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Cold start valve or thermal temp. switch or ? (archive)
[ Follow Ups ] [ 5-series (E28) Message Board ] [ Msg. Board FAQ ]
Posted by Terry Donlin on January 07, 2001 at 17:27:07:

My '86 535i starts a little hard when cold - meaning I have to pump the accelerator to keep it running for about the first 15 seconds. (Temps around 40 degrees F.)
Secondly once I have driven the car somewhere and let it sit for 30 minutes to 90 minutes it will not start if I don't get it to start on the first attempt.
I suspect the cold start valve or thermal temp. switch.
I see that BMP sells a replacement thermal switch with a longer activation time. Could this solve the problem.
Any hints or diagnostic checks would be appreciated.

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