Question about 1990 Jeep Cherokee Limited

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Jeep Revving Itself to 3000rpm on start-up

My 1990 Jeep revs up to 3000rpm sometimes when I start it, took it to Jiffy Lube for reg. new car maintenance and they didn't know what it was. Any ideas??!

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  • Richard Scordino May 11, 2010

    Take it to a real shop...JL is the last place you should be seeking any mechanical advise!!

  • mechanic144 May 11, 2010

    some jeeps and chrysler products of that particular year, it common for a sudden engine flare for a few seconds...however, if this was never a concern before, then i need to ask if you had your cooling system worked on there? flushed? etc...if so, it sounds like there might a be a faulty engine coolant temperature sensor...as long as you keep the old coolant in the engine, it develeops a scaly build up on the engine radiator core etc and coolant temp sensor..if you flushed it, it cleaned off the temp sensor allowing it to read as if its cold all the time and allowing to tell the PCM to dump the fuel to the engine until it warms up...try replacing that...

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  • Master
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Check for vacuum hose off or vacuum leak

Posted on Nov 25, 2009

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