Stalling and rough idle problem.

340

Asked by Nov 09, 2011 at 08:50 PM about the 2002 Jeep Grand Cherokee Laredo 4WD

Question type: Maintenance & Repair

My 2002 Grand Cherokee 4.0l recently started  having rough idle problems. I did a tune up..changed the plugs.....replaced the coil rail.....air filter.....gas filter. The idle is still rough and now it stalls suddenly. It has stalled while I was highway driving.....sitting at a light...ect. It doesn't seem to be the fuel pump as I can hear it come on when I turn the key. Anyone have any ideas what it could be?

Thanks!

Dolfan

11 Answers

3,095

If you can HEAR the fuel pump, then that might be the issue. Normally fuel pumps get really noisy when they are beginning to fail. Due to clogged fuel filters the pump fails soon after. Replace both or get the fuel pressure checked at the fuel rails on the engine. Other possible issues could be crank sensor or intake MAF sensor. Wouldn't hurt to take some MAF sensor cleaner to it and also clean out your throttle bottle. I think there is a idle control sensor in the throttle body near the butterfly valve. Check that too.

4 of 4 people found this helpful.
340

Thanks Matt. I changed out my cranksaft postion sensor. I got the error code off the odometer and AutoZone said it was the sensor. I just swapped it out so we'll see if it stalls again. If not I'll look into the fuel pump. Thanks again. I'll let you know how it goes.

4 of 4 people found this helpful.
340

I have had no more stalling or rough idling so I guess it was the crankshaft sensor. Thanks again for the response Matt.

2 of 2 people found this helpful.
3,095

You're welcome.

1 of 1 people found this helpful.
90

I had a similar problem with my 2000; finally solved with new fuel filter. the fuel filter is also the fuel pressure regulator.

9 of 9 people found this helpful.
50

Just so I understand, on a 2002 jeep Cherokee the fuel pressure regulator is inside the fuel filter ???

5 of 5 people found this helpful.
80

My 2004 grand jeep stalls out when I stop at a light what could it be

8 of 8 people found this helpful.
50

Ive the same problem .. just changed the crank sensor .. Still stalls and no break and steering also freezes .. Its very dangerous .. Sbody pls help . Can it be the mass sensor ??

5 of 5 people found this helpful.
40

I have a 1988 jeep cherokee n it has a rough idle n a miss. It starts up fine n sometimes the rpms well stay at 3000 rpms. I sometimes have to turn the engine off n back on for the rpms to drop down to abt 1000. Then it wants to lug down while im driving on the highway then it picks back up again

4 of 4 people found this helpful.
10

My jeepnhas done this a few times. It ended uo being the relay sensor or the throttle positioning sensor. Both are under 40 bucks and very easy to change.

1 of 1 people found this helpful.

Previously I changed the O2 sensors and throttle positioning sensor on my 2004 to fix idle issues. 2 years later having idle issues again the vehicle wants to idle at 1500 - 2000 RPM. Should I replace fuel filter and fuel pump?

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