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Go Back JeepForum.com > Models > Jeep Grand Cherokee & Commander Forums > ZJ Grand Cherokee Forum > Timing and vibration problems!

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Unread 05-28-2002, 12:51 PM   #1
sccoupe30
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Join Date: May 2002
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Timing and vibration problems!

How is the timing changed on the 4.0? I have to run plus all of the time and high test when pulling a trailer. It pings like it needs the timing backed off. If this cannot be done, what is another solution? This thing should be able to run 87 octane. Next question. I have a vibration in the front end. You really feel it above 50 mph. Ive put new tires all the way around and changed all 5 of the U-joints up front. What else is a common problem on these?

Thanks all!

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Unread 05-29-2002, 09:29 AM   #2
Big Dumb White Guy
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Join Date: Dec 2001
Posts: 254
did you get an alignment? maybe try rotating the tires. i know they are new but ya never know......
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Unread 05-30-2002, 06:37 AM   #3
head27
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well i try what he said...also maybe a bent rim or try so tighten everything on the suspension..that was my problem
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