Question about 1999 Jeep Grand Cherokee

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The revolutios x min. go ups and down for no reason

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Thats to vague a description but look at the basics first if idle is erratic then it could be plugs,vaccum leak,plugged fuel filter,plugged air filter.

Posted on Sep 27, 2009

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1990 ford f-150 5.0 auto idles at 2000-2200 when warm, it goes up and down when heat or cooling is used.Changed IAC valve and checked pcv valve.What do I look for next?


first thing to do is to disconnect the battery for about 15 min. this lets the computer clear out its old idle strategy. reconnect the battery, turn of a/c and any other electrical loads and let it just idle for 10 -15 min. then turn on a/c and let idle another 10 min. this lets the computer relearn the idle strategy. if it still idles fast, check that the throttle plates are in fact all the way closed, and not hung open for some reason. if that's ok, check for a vaccuum leak. ok, on second thought, maybe check for a vacuum leak first, it would be fairly big if its idling that high

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No heat


sounds like heater core change it probably your reason.

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