tony Posted January 12, 2012 Posted January 12, 2012 Whan starting my '90 MJ 4.0, it immediately over-revs for 2-3 seconds and then drops back to a normal idle speed. Any thoughts?
Squeegy410 Posted January 12, 2012 Posted January 12, 2012 You mean as soon as it starts it jumps up to around 2k rpm's, then after a couple seconds idles down to normal? simple answer is: its a renix, so its going to do that.
87Warrior Posted January 12, 2012 Posted January 12, 2012 Your idle air control (IAC) could be sticking a little. Pull off the throttle body and give it a good scrub.
cruiser54 Posted January 12, 2012 Posted January 12, 2012 Your idle air control (IAC) could be sticking a little. Pull off the throttle body and give it a good scrub. Good idea. Replace the mounting gasket when you do it or you could get a vacuum leak.
1987Comanche Posted January 13, 2012 Posted January 13, 2012 Bad TPS. It's happened to my '90 4.0 twice so far.
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