97 Grand Cherokee HIGH IDLE!

jameslarsonsdsu · 08-30-2010, 10:51 PM

I have a 1997 JGC with 180,000 miles. It has a high idle, 1000 RPM after start-up and 1700-2000 RPM after warmed up. Recently I have changed the TPS, IAC motor, Air Filter, Oil, Plugs, Wires, Cap, and Rotor. I have also cleaned the throttle body. Nothing helped. At stoplights, I put it in neutral so I don't have to firmly hold the brakes. Does anybody have any ideas? Thanks

Unk · 08-30-2010, 11:07 PM

This might be totally unrelated but I had a Dodge truck do that and the speed sensor was the culprit.
It was in the rear differential.
If your speedometer doesn't work that might be a clue.
On this one it calibrates the idle air control after receiving the speed signal.

danielsatur · 08-30-2010, 11:29 PM

Because of age + mileage suspect bad gaskets, rubber, or plastic.

Do a Google ''Youtube smoke vacuum test''

mastertech1964 · 09-03-2010, 02:02 PM

i would definetly be hunting down vacuum leaks

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