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Old 08-30-2010, 08:23 PM   #1
Join Date: Aug 2010
Posts: 9
Unhappy Help!!! Jeep shakes when idling.....

After flushing the cooling system and changing out the water pump now when I start the Jeep it shakes slightly. You can feel the vibration in the steering wheel, gearshift, and the foot pedal. I am totally baffled and am getting no answers. Can't figure out if I need a new serpentine belt, if the belt is loose, if I need a new water pump pulley, etc. This all happened after I changed out the water pump. I did have to replace the long bolt on the top of the water pump with a longer bolt and washers since I broke the flange bolt. The bolt is kinda under the water pump pulley but it is not hitting it. I could sure use some suggestions since I'm not sure if I did something or if it just all started coincidintely when I changed the pump out.....

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Old 08-30-2010, 08:29 PM   #2
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Take a look at the fan, pulleys, and belt from the side while idling. See if everything is turning in a perfect line. Other than that..... maybe a motor mount? Let us know what you find out.

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Old 08-30-2010, 08:38 PM   #3
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It all looks like it is in line. One thing I was wondering....When I put the water pump pulley back on I couldn't figure out how to keep it still to tighten the bolts so I had a big screwdriver wedged between the pulley and the pump to keep it still. Probably a stupid thing to do but is it possible that I slightly warped the pully and it is not turning true now? Just a thought since I am pulling my hair out and am going to Colorado in 3 weeks....
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Old 08-30-2010, 08:46 PM   #4
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That sounds like a definate possibility. If you determine that is the problem don't run the engine until it is replaced because you will damage the new water pump.
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Old 08-30-2010, 09:49 PM   #5
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Hi there, I am new here but have some input to your problem. I am an auto technician by trade and the worst thing is when a new problem arises after a repair.... but this is always somewhat easy to diagnose. Did you remove anything else on the car during the job? Something like a vacuum hose, ignition component, etc? Aside from that, if you did warp the pulley it'd probably be visible from the side. To narrow it down, remove the belt and start the car (this will be fine for a few seconds) and see if it still shakes. Then you'll know if it's belt or pulley related. Don't let it run long like this though, no water pump or alternator. If you post your results I'll get back to you on other ideas.
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Old 08-30-2010, 09:54 PM   #6

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Although you did not do anything with the electrical system it is a common problem to have an engine shake when one of the cylinders is not firing. This of course is more common in the 4 bangers. What year is your Jeep and what engine does it have?
2000 Sahara, 3.5" Rubicon Express Lift, 1" spring spacer & 1" Body Lift, 33" or 35" BFG Mud tires, Front & Rear ARB, Rancho 9000 shocks, UCF Ultra High Belly Up

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Old 08-30-2010, 11:08 PM   #7
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06TJ....That is a good idea to try. I never thought to do that so I'll give it a shot tomorrow. I really can't see any problems with the pulley but am grasping for straws here....

doclouie....I did take the spark plugs out, cleaned them and re-gaped them. It is starting better but that did not fix the original problem. What else could possibly cause a firing problem? I have a 2000 w/ 4.0L 6 cyl.....

I appreciate ALL of you trying to help....Just getting frustrated but I still LOVE my Jeep....

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