Question about 1993 GMC Jimmy

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93 jimmy My Jimmy starts, then after it warms up the idle speed goes up then down, then when I turn it off it will not start until it cools down (or so it seems)

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Could be either fuel pump or fuel injection system (spiders).. especially if neither have been replaced yet.. also, suggest you have computer checked for possible malfuction. Good luck

Posted on Aug 25, 2008

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I have replaced my fuel pump, filter, throttle position sensor, and relay on my 1992 jimmy. it runs but everytime it hits idle speed it cuts off. what could that be


It should have an idle air control valve which lets air into the intake to control the idle speed. The valve could be faulty, or dirty, or the throttle body could be dirty. The computer opens and closes the valve to regulate idle speed.

Jul 16, 2012 | 1992 GMC Jimmy

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1999 JIMMY OIL PRESSURE drops with RPMs after warm


Normal is 10w30.
If the oil pressure gauge is correct, my guess would be worn engine bearings and / or oil pump.

Jul 14, 2012 | GMC Jimmy Cars & Trucks

1 Answer

1999 JImmy after vehicle sits over 3 hours I start (not a problem to start) it will idle at 500 RMPs and start to putter and putter. If I hit the gas it will go to 3000 RPMS with no problem then once I...


Try cleaning the throttle body (throttle body cleanner ONLY). Uncover the TB (engine off) & inspect the butterfly by moving the throttle by hand, if the underside & down inside the TB has a bunch of carbon (black soot) that could hamper with the idle! Also, check the fuel pressure @ the rail, under 60 psi could cause bad idle. Air filter clean? Did you make SURE that the terminals under the spider injector wiring harness has NO pins bent over during connection?! Also could check the throttle possition sensor & the mass air flow sensor if need be.

Aug 25, 2010 | 1999 GMC Jimmy

1 Answer

1997 jimmy car shut off while driving. replaced


SCAN IT SOUND LIKE IDLE SPEED CONTROL PROBLEM.BUT I AM LOOKING AT VACUUM LEAK AT THE INTAKE MANIFOLD BROKE VACUUM HOSE. OR FUEL INJECTORS SEALS LEAKING.

May 12, 2010 | 1997 GMC Jimmy

1 Answer

Will not start after driving 1997 gmc jimmy


Sounds like you want to check for a vacuum leak at the intake manifold gaskets. This can easily be done with a can of WD-40. Spray the oil around the gasket areas, and, on all vacuum lines.P.S. do this with the engine running. I'm sure you'll hear a stumble or slowing of the engine, if you do concentrate the spray until you're able to pinpoint the leak. Thanks, Dana

Sep 22, 2009 | 1999 GMC Jimmy

1 Answer

1994 GMC Jimmy hard to start and runs rough when first started


i think if you checked the sparking plugs and map sensors then check your distributer its maybe not delivering the current nedded to perform the spark to some of the cylinders

May 30, 2009 | 1994 GMC Jimmy

1 Answer

1994 GMC Jimmy hard to start and runs rough when first started


did you do a fuel pressure test? if you havent do it its cheep an at least you can elimanate that. if thats not an issue, then there is only two other things crank sensor, and if there is one cam sensor.

Feb 02, 2009 | 1994 GMC Jimmy

1 Answer

91 jimmy starts cold, runs rough hot, dies when put in drive


Try to unplug the mass airflow sensor and start it. It will idle higher but should run fine. If it works then you need a MAF sensor. Be sure you have an OBDII code puller to clear the computer when done

Jan 25, 2009 | 1995 GMC Jimmy

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