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OOps...88 model uses the coolant temp sensor.... (archive)

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Posted by funfer on January 12, 2001 at 07:12:35:

In Reply to: Check out the thermal time switch..... posted by funfer on January 11, 2001 at 20:54:10:

...not a thermal time switch. It does not have a cold start valve but rather uses the upgraded ECU (Motronic 1.1)to keep the injectors open longer during cold start conditions. If the ECU does not recieve the'cold' signal, it will run too lean for the temperature, which leads to stumbling. If the ICV was the problem the idle would constantly go up and down...whether in drive or not. The 88 model does not have an adjustable ICV. On the 88 the ECU regulates the idle/ICV. Weird that it happends in drive and not in neutral...but it runs fine after it is warm.

Secondary to that would to be to test for vacuum leaks....injector seal leaks etc....but do check out the thermal time switch first. Good luck.

1988 528e. Usually starts up well when it is cold, but when I am sitting in traffic in drive, the idle goes up and down. So, I'll put it in Neutral and it appears to idle fine. When it warms up it also idles pretty good. For some reason, it always seems to run rough right after I start it and start to drive. Any ideas?


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