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Old 11-25-2010, 09:25 PM
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Blue Bowtie Blue Bowtie is offline
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Re: 96 gmc jimmy 4dr 4x4 cold start throttle down

Test the CTS resistance at a known temperature. I know the CTS was replaced, but it sounds like the PCM may think it is considerably colder than it actually is. This will cause a very rich mixture as you describe.

A leaking line set, FPR, or poppet wouldn't care if it was above 60ºF, but the CTS would. Even if the CTS is new, the wiring isn't. Since you stated
Quote:
The weird part is it also is showing running at anywhere between -19 degs to -35 degs. runs fine but I think that is wrong or part of the issue
that should be a clue that the PCM doesn't know the temperature and is defaulting to full rich for injector PW.
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