Question about 2000 Jeep Grand Cherokee

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MY 2000 JEEP WITH 4.7 ENGINE,IT WILL RUN GOOD WITH ZERO CODES.THEN ALL AF A SUDDEN ,IT BEGINS TO SURGE,GOING UP TO 2000RPM AND DOWN THEN UP AGAIN.WHEN I CHECK THE CODES AGAIN,THERE WILL BE CODES READING LIKE 202,207,208 WHICH READS -INJECTOR CIRCUIT OPEN,IT HAPPENS EVERY TIME,WHATY IS HAPPENING,PLEASE REPLY

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  • Jeep Master
  • 15,575 Answers

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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6ya6ya
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Posted on Jan 02, 2017

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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

  • 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

SOURCE: pcm

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

Posted on May 18, 2009

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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

carlsbiz
  • 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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95 jeep Cherokee loss of power going up hill or even pushing on gas at 50mph then pops and sputters....at an idel getting a serge jumps from 1000rpm to 2000 rpm and back down WTF....I need help


I would replace the spark plug wires and spark plugs first and verify correct fuel pressure. Also do an OBD1 fault code test. You can do this test by turning the ignition key to run and then off and then to ruin and off then to run and wait for check engine light to blink out codes, codes will be a number of flashes and a pause and then more, for instance 4 blinks and then pause and 3 blinks, that is fault code 43

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Heater core


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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...


If a dealer can not fix it, we can't guess at the unknown

Now your involved with a dealer leave it there, until
they solve it. Somebody has to stay with it, to a successfull
conclusion.

You could ask around about repair shops that are good at
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1995 jeep cherokee drove across country to vail colorado and the engine is turning over but wouldn't start. Took it to a jeep dealer and they said they couldnt replicate the problem , it started every time...


Without running any tests, it is pretty much impossible to tell you why it would not start.
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.
As i said though...Without testing I'm only giving you test options and a good guess.

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1 Answer

How to air my radiator to a Jeep Grand Cherokee 2001 3.1 engine ?


Try removing the radiator cap when the engine is cool and top off the coolant level. Start the engine with the cap of and let it run to operating temperature which is when the thermostat opens. If you lightly grab the upper radiator hose. If it is cool or warm, the thermostat has not opened. If it is hot, the thermostat has opened. At that time have someone assist you by sitting in the car to rev the engine up (1800 to 2000rpm) and hold it there while you once again top off the radiator and tighten the cap. DO NOT BRING THE RPM DOWN TO IDLE WITHOUT HAVING THE CAP ON TIGHT! THE HOT COOLANT WILL OVERFLOW FROM THE RADIATOR! Then let the engine run to see if the air has escaped. You may have to do this procedure more than once. If at any time you feel that the engine is getting too hot, tighten the radiator cap and then shut the engine off. Then let it sit and repeat the steps above. Constantly monitor your temperature gauge at all times.

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none of the above
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1 Answer

99 Jeep oil pressure problems


Sounds like a bad pressure sending unit, or a partially plugged passage going to it. First though, check that the wire connection is good on the unit. Sometimes just adding a good additive such as marvel oil will free it up sufficiently to restore function. With no noises etc, that's the most likely source of your problem. If not, driving as you have been the engine would be junk by now!!!
Good luck

Jan 15, 2009 | 1999 Jeep Grand Cherokee

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