Question about 2000 Jeep Grand Cherokee

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  • Jeep Master
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I have seen jeep TPS - throttle position sensors cause a surge like you describe , but not with injector circuit code's . The PCM - engine computer controls the injectors by supplying a PWM - pulse width modulation ground . Checking the electrical circuits for those injector's would be the thing to do . Do you know how to test electrical circuit's ? Plus checking the drivers (transistors ) inside the PCM should be done . Could be a wiring or computer problem or even those injectors could be failing .
How to Check Fuel Injector Resistance with Multimeter
How to test fuel injector circuit with basic tools open control wire

Posted on Jan 01, 2018


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6ya staff

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Posted on Jan 02, 2017


Richard Scordino

  • 6982 Answers

SOURCE: 2002 jeep cheroke misfires on cylinder #4

Check intake gasket and vecuum hoses near intake runner #4. To do this spray carb cleaner at parting line between manifold and block while engine is running. If leaking rpm will dramatically change. A leak will lean out that cyl and cause misfire

Posted on Feb 26, 2009

Timothy Sorenson

  • 41 Answers

SOURCE: jeep will just die going down doad or will not start, had a code that read camchaft sensor replaced that still the same, now i have a code that reads injector circuit malfunction i mhave changed fuel

That sounds like a bad grounding wire, or possible PCM malfunction. Check all engine wiring harness locations for any corrosion or damage. let me know what engine type you have, and I could look up the wiring schematics

Posted on Apr 25, 2009


  • 102 Answers


first is check fuses, if none bad it's a bad pcm

Posted on May 18, 2009

Bruce Hathcock

  • 3600 Answers

SOURCE: i have a jeep cherokee 01 and the check engine

tinyp78 has it right if it has the check engine light on then don't run it as it will damage the catalytic converter, as well if the injector fails and exlodes the parts can go into engine and damage a valve or cylinder.

Posted on Jul 05, 2009



  • 1124 Answers

SOURCE: 2000 jeep cherokee laredo - Check engine light

Could be a vacuum issue or the modulator..

The modulator tells it when to shift and is controlled by vacuum presure..
Check all vacuum lines that rum from the tranie for cracks, spits etc..

it could also be a sensor..

Hope this helps !!
Please rate me good ;o)

Posted on Jul 11, 2009

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My 2002 GC 4wd automatic trans 4.0 engine shuts down only when the outside air temp is above 80 degrees. When approaching a red light / stop sign, I let off the gas pedal and at times it will shut down...

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Now your involved with a dealer leave it there, until
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What I can tell you is that if the engine turns when you turn the key, the starter is good. Only exception there is if it turns much slower than normal and battery is fully charged.(verified again by testing). The starters only job is to turn the engine. Your ignition and fuel system is what makes it start and run. A thermostat has nothing to do with starting. If the engine temp is normal when running and you have not overheated it is fine.
Shops use a scanner attached to the vehicles computer system in order to begin diagnosis. The vehicle computer stores fault codes. Most larger parts stores will do a basic scan for free. have that done and see if there are any faults stored...that will give you some idea what may actually be going on. One item that won't show up on a scan is your fuel pump. If the vehicle stalls and you cannot hear the pump when you turn the key back on, that should be looked at.
Often when a pump begins to fail, it gets hot and binds. Once cooled down it will resume operation 'till it heats up again.
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