Question about 2008 Jeep Grand Cherokee

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My 1990 Jeep Cherokee Limited idle speed fluctuates up and down..when I am driving at cruising speed the car begins to shake. When I am driving on the freeway above 55mph the car shakes constantly. I recently replaced the alternator, had a tune-up, replaced the radiator, replaced the water pump, and had a new computer installed. Any ideas on what could be wrong?

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Shaking at speed indicates a wheel alignment or worn front end and suspension problems

Posted on Sep 18, 2017

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Posted on Jan 02, 2017

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artismo

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SOURCE: My 1990 Jeep Cherokee Limited idle speed

hey there, artismo here! I have a similar problem with the idle fluctuating, and the trans down shifting itself at light throttle, which is the lock-up in the converter getting the wrong signal ? from the ECM.

Posted on Dec 31, 2010

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1 Answer

I have a 2001 Grand Cherokee. After driving on the highway for 125 plus mile with the cruise on the tach will start to move a few hundred RPMs. It will start with 200 then a little more and then 500 and...


The most likely cause is a bad throttle position sensor (TPS). It's located on the throttle body. With the engine idling, grab the connector on it and move it up and down. If the idle fluctuates it is for sure bad. Otherwise you will need a scanner to properly diagnose your problem.

Apr 18, 2011 | 2001 Jeep Grand Cherokee

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Runs good most of time,but sometimes it feels like it loses power but if you let off gas or give it more gas it straightens out and runs good until it gets to cruising speed and then does it again.


Sounds like a fuel filter. Question - When was last healthy tune up? Plugs, wires, All filters especially fuel filter? I'd start there and then run a good fuel system cleaner through it. Ut'll give you a good "ground zero" point if problem continues.

Feb 25, 2011 | 1995 Jeep Grand Cherokee

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I have a 1989 Jeep Cherokee Pioneer with 242k miles on it. In line 6, 5 speed manual, 4 wheel drive. I am having trouble with it starting the first time. When it does start it will idle high for about ten...


mine also will quit going down the road, and idles high at times, or idles low, like having a mine of it's own. possibly idle air speed solenoid (which i replaced on mine) and still does this. another tech said only factory solenoid will "talk" to ecm properly?

Sep 01, 2010 | 1990 Jeep Cherokee Limited

1 Answer

My 1990 Jeep Cherokee Limited idle speed fluctuates up and down..when I am driving at cruising speed the car begins to shake. When I am driving on the freeway above 55mph the car shakes constantly. I...


hey there, artismo here! I have a similar problem with the idle fluctuating, and the trans down shifting itself at light throttle, which is the lock-up in the converter getting the wrong signal ? from the ECM.

Aug 12, 2010 | 1990 Jeep Cherokee Limited

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I have a 1990 Jeep Cherokee Starts then shuts off


Sounds like insufficient fuel delivery. Likely problem is the fuel filter is plugged.

Jul 14, 2009 | 1990 Jeep Cherokee Limited

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How do you replace the oil pump in a 1990 jeep cherokee limited ?


DROP DOWN YOUR OIL PAN BY UNBOLTING IT THEN TWO MACHINE BOLTS HOLD THE PUMP UP TO THE MOTOR.THIS IS A EASY FIX YOU CAN DO IT.

Jan 17, 2009 | 1990 Jeep Cherokee Limited

1 Answer

2002 Grand Cherokee engine revs


Since you have a Laredo this should be where it is going in and out of overdrive. The reason is because 60mph is right at the end of the power range before going into overdrive. The other reason on your idle fluctuation is due to the cooling fan kicking on and off. Higher RPM's occur as the engine is trying to cool back down after reaching optimal temp. I due have a partial solution if you want better performance out of your jeep and will help MPG. You can replace the spark plugs and air filter for both mpg and performance. Local auto store should be able to recommend platnium or iridium plugs for your jeep. But K and N is the best air filter to replace it with. It will cost around 50 dollars but it has a lifetime warranty and is cleanable. If you decide on new plugs make sure to spend a few extra bucks and get some with a 3 to 5 year warranty. Just replace them before the warranty is up. Stephen

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1990 jeep cherokee won't idle


check the ...PVC valve and the MAF sensor.

Aug 24, 2008 | 1990 Jeep Cherokee Limited

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