Question about 1992 Chevrolet K1500
If the vehicle has a automatic transmission, check the Neutral Safety Switch. If defective from wear it could be sending incorrect signals to the Electronic Control Module which in turn sends signals to the Idle Air Control. It will make the computer think the transmission is in gear and lower the RPMs and then when the transmission is actually in gear the physical load will lower the RPMs even more. To check, set the parking brake and move the gear selector to Neutral and check the RPMs to see if the engine maintains a constant 650 +/-. Next, shift to Drive and check if RPMs drop to and maintain 500 +/-. If it does then you have diagnosed the problem. The original equipment Idle Air Control motors rarely wear out.
Posted on Apr 22, 2014
There is no adjusting you can change the throttle position sensor this tells the ecm what the idle is also check for vacumm leaks and the pcv
Posted on Jan 01, 2011
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Posted on Jan 02, 2017
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