Question about 1990 Jeep Cherokee Limited

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90 Cherokee Laredo 4.0 Replaced the throttle body, and fuel pump. When it starts it revs up to 2100 RPM's then dies.

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  • Richard Scordino May 11, 2010

    sounds like a large vacuum leak manifold, hoses etc all need to be checked carefully.



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Fuel system should be ok. check for air leaks around throttle body, make sure TBI gasket or o-ring are not sucking air which will cause high RPM's, also check for vaccum leaks.

Posted on Nov 16, 2009


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I replaced the fuel pump, the EGR, MAP,IAC,sensors and now the engine revs too high at start around 3200 rpm, the revs go down when put in drive to 1500rpm 1991 Chevy Camaro V6 3.1 Everyone here said to...

My experience has been with later model vehicles, but a bad throttle position sensor most definetly causes this type of situation. Two torx screws, opposite side if the throttle body, should have a three wire plug.

Aug 17, 2011 | 1991 Chevrolet Camaro

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Rough idle and stumble through acceleration. The fuel filter, Pressure regulator, Throttle body and tps have all been replaced as well as a full tune up. The fuel pump runs 90% of the time and other times...

You need to check the fuel pressure to the throttle body. If the fuel pump is nearly worn out, it will display similar symptoms. Did you read out any codes on the computer before starting this repair? Good luck!

Jul 17, 2010 | 1988 Jeep Cherokee

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When starting, engine will rev up to 3000 rpm then will die. but you can keep it running if you keep it revved up above 3000 rpm

Things to look for: Could be your intake manifold gasket, throttle position sensor, vacuum hoses, throttle body gasket, idle screw, fuel pump, fuel filter, fuel pressure regulator, or maybe you have a split in your gas tank or fuel line(s) that is messing with your fuel pressure. See if you smell gas back near the driver's side rear wheel.

Good luck, those are things I would search for, I can't promise anything, could be a number of things. You should have a check engine light on.

May 23, 2010 | 1993 Honda Accord

1 Answer

I replaced the plugs, wires and distributor but now it winds down to 800 rpm and almost dies then revs itself back up and continues to do this

if no codes -check fuel pressure possible fuel filter clogging-if fuel pressure good check the throttle body fuel regulator may need servicing-

Apr 11, 2010 | 1997 GMC Sierra

1 Answer

91 jeep cherokee laredo ecm fuse blows less than 10 sec after i put it in drive..replaced the fuse starts and runs normal. it idles fine can rev it up to 4k rpm with no problem just happens when shifting...

sounds like wiring harness rubing on the body some were . i would ck the harness that runs down to the transmission and make sure no wiring is laying on the exshausth

Oct 27, 2009 | 1991 Jeep Cherokee Briarwood

1 Answer

Abrupt stall

Take air intake duct off at throttle body and spray WD-40 into throttle body with plate open, then try to start, if it fires up for a second, then dies, it's a fuel delivery problem.

Jul 10, 2009 | 1995 Jeep Grand Cherokee

1 Answer

Starts then dies !

Like I said, odds are air fuel mixture. So if it's worse, you're probally right on not enough fuel. So either fuel filter or pump.

Oct 22, 2008 | 2001 Jeep Grand Cherokee

2 Answers

My car died a couple of days ago when I was driving. The codes P0505 and P0123 appeared. I replaced the sensors and the car still won't start and P0505 was still showing up

the idle air control valve is on the throttle body below the throttle positioning sensor. To test first, use a test light on the connection coming to it with the vehicle running. Rev the motor and each terminal should make the light flash. In this case it is most likely the sensor. If they do not flash it is in the wiring or pcm

Oct 04, 2008 | 2000 Jeep Grand Cherokee

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