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05-09-2017
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#17 |
 
Join Date: Dec 2003
Location: Arcadia,OK
Posts: 3,395
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Re: High idle after driving
The problem may be in the ECM PROM. There are 3 different versions for the 1990 ZR-1, the original & 2 upgrade versions by GM to resolve issues, one of which was high idle.
Here are the 3 different calibration versions in the order of release. The number is on the PROM. 1990 ; 16129717, 16148554 & 16163905
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Jerry Downey JERRYS LT5 GASKETS & PARTS http://www.jerrysgaskets.com 1994 ZR-1, Black/Black, Lingenfelter Aerobody, 416cu in, 3.91 gears, coil-over susp, Brembo brakes, etc. 2016 Black-Red, 3LT-Z51 Auto 8-speed. |
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