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'90 DeVille '97 DeVille
83 Posts
Discussion Starter · #1 ·
I have a 1990 SDV with a 4.5. When I back off the gas, the engine will not drop to curb idle until 5 mph. I am told this is normal, but it drives me nuts. It's hard on the brakes, and unsafe on ice. So, two questions:
1) What input tells the ECM vehicle speed?
2) Has anyone re-programmed or installed a different chip in their 4.5 ECM that would correct this??
Except for this glich, the car runs like a "raped ape".
Thanks for any help. This is a great site!
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