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1998 JEEP GRAND CHEROKEE wont idle runs really rough

Wont idle runs really rough it will drive as long as i keep my foot on pedal as soon as I let up it dies. so far I have put a new distributer, new plugs and wires CRANK SENSOR, idle air sensor,. I even went to jeep and bought the crank shaft sensor from jeep?

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  • ladonna Feb 16, 2014

    i forgot i also bought a new power control module, brand new battery

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  • 166 Answers

The others have suggested the likely suspects, I would add be sure to check the EGR valve for proper operation. If it is stuck open it can cause these kinds of problems.

Posted on Jan 16, 2015

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  • Expert
  • 85 Answers

Look for a vacuum leak at the intake manifold. Spray (flammable) brake clean around the area while the engine is running and look for the idle to change. Also check for a vac leak at the brake booster by pinching the Vac supply line and see if the idle changes.

Posted on Feb 17, 2014

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Posted on Jan 02, 2017

Mikey108
  • 475 Answers

SOURCE: 1988 jeep cherokee idles rough, and will die while driving

Sounds like it could be a bad map sensor.
Black smoke?

Posted on Oct 14, 2008

  • 80 Answers

SOURCE: I have a '97 Jeep Grand Cherokee Laredo 4.0 liter that won't idle

Check your throtle postition sensor. It monitors what postion the throtle is at and sends that info to the ecm. It will go bad and cause that problem.

Posted on Feb 10, 2010

dhorsefield
  • 286 Answers

SOURCE: 1998 Grand Cherokee Jeep...4.0..idles rough and

Check any rubber hose pieces between the PVC valve and the motor (intake). Normally a leaking hose will have a soft squishy area in the hose where the rubber is melting and the hose will create a vacuum leak at that point. You can tape over the squishy area with electrical tape (get it tight) and if it runs better you should replace the hose pieces. This leak will cause the motor to run very rough at idle, can cause the motor to race when starting it, can cause the vehicle to shift hard (when motor surges) and can throw scan codes indicating Lean Bank 1 AND Lean Bank 2 (presence of both codes is good indicator that vacuum leak is the cause).

Posted on Aug 06, 2010

  • 27 Answers

SOURCE: 1997 Jeep Grand Cherokee dies while driving

If the ignition turns on and dies while driving, you might have a clogged idle air control valve. The valve is located in the throtle body, just below the air intake hose. Locate the idle air control valve, un plug the connector, unscrew it (you will need star screw driver) and next clean it using an electronic contact cleaner spray, I use 3M for that. Next, make sure all cleaning liquid inside is gone (it evaporates quickly) and re assemble it. This should solve your problem once for all.

Posted on Aug 11, 2010

  • 3 Answers

SOURCE: 1998 jeep grand cherokee keeps

similar problem with mine. disconnect battery for 45 min and better=
reconnect battery 1 hr later better/causes car computer to reset

Posted on Sep 13, 2010

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1 Answer

Grand Cherokee Idles rough then will not start.


thats a lean code have fuel pressure tested

Jun 06, 2013 | 1998 Jeep Grand Cherokee

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2002 jeep grand Cherokee change batt. Now it starts but won't run?


Because you disconnected the battery you lost the long trim value,you will now have to relearn the idle,start the vehicle idle it to 1500 RPM,hold for a minute,idle should stabilize,turn on A/C let it idle,for a minute,now your done,

Aug 19, 2012 | 2002 Jeep Grand Cherokee

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Jeep 2002 grand cherokee dies unless i keep foot on the gas...


The idle relearn needs reset. Keep your foot on the gas at about 900 rpm. Make it idle for about 5-6 minutes. Slowly ease up on the gas until it will idle on it's own, it might take a while. After you get it to idle, it might be idling real low, but on its own, Let it sit and idle until for 20 minutes. After that it should be back to normal. You will have to do this every time you have the battery unhooked for a while.

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1 Answer

I have a '97 Jeep Grand Cherokee Laredo 4.0 liter that won't idle


Check your throtle postition sensor. It monitors what postion the throtle is at and sends that info to the ecm. It will go bad and cause that problem.

Feb 09, 2010 | 1997 Jeep Grand Cherokee

1 Answer

Runs rough on acceleration and surges when removing foot from accelerator. Also, has poor gas mileage. The vehicle is a 1998 Grand Cherokee with 5.2, automatic with four wheel drive.


This sounds like one of two things. Depending heavily on your vehicles milage, you could need a new EGR valve or a new timing chain/belt. Thank you, Dana

Jan 29, 2010 | 1998 Jeep Cherokee

1 Answer

1998 Jeep Grand Cherokee has a rough idle at first


You do have a filter and it's mounted right on top of the pump on outside of tank...it is also the pressure regulator. You really should put a pressure gauge on the fuel system and check it out though. you may find there is a problem elsewhere. Good and proper testing is the only way to get answers about problems especially now that systems are all electronically controlled.

Jul 10, 2009 | 1998 Jeep Grand Cherokee

2 Answers

2003 Jeep Grand Cherokee Runs Rough


It sounds like a few different things or a combination of more than one.

  1. The EGR valve
  2. The catalytic converter
  3. The mass airflow sensor

May 09, 2009 | 1998 Jeep Cherokee

2 Answers

Wont hold idle will start with foot depressing gas pedal will run with foot on gas but stalls when foot removed


Check and clean Idle air control valve. Make sure its responding to signal as well. Also make sure ther are no vacuum hoses disconnected. This may not be a "cure" but it's a good place to start.

Apr 14, 2009 | 2001 Jeep Grand Cherokee

2 Answers

Wont stay runing


try pulling the plug out on the idle air control valve then start it if thats not it try the map then the idle control

Dec 13, 2008 | 1998 Jeep Grand Cherokee

1 Answer

1988 jeep cherokee idles rough, and will die while driving


Sounds like it could be a bad map sensor.
Black smoke?

Sep 16, 2008 | 1988 Jeep Cherokee

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