1500 96 4.8 eng idles fast

Asked by Mar 01, 2014 at 11:01 PM about the 1999 Chevrolet Silverado 1500 STD Standard Cab LB

Question type: Maintenance & Repair

i have replaced idle air c, manifold af, ect, cool temp senor, vss, egr, throtles position s,
does not show a code  idle speed 1300  to 1800 rpm! need help?

3 Answers

113,325

Possible vacuum leak. Have you checked your pcv? If it's stuck open could possibly cause this issue.

98,575

I agree with dandy about the vacuum leak. After you have checked for a vacuum leak you might try to reset the ECM and then drive it as normal so it can relearn.

60

Check the gasket at the base of the throttle body and try some spray intake cleaner on the butter fly in behind the air intake.

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