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Unread 03-08-2013, 09:09 PM   #1
andersoneric04
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Join Date: Mar 2013
Location: madison, wi
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small shake during idle?

Hi guys I just bought a 2004 Jeep grand cherokee today. It has a straight six and sounded great a week ago when I test drove it. After driving it home today I noticed an intermitent slight shake during idle(appx every 30-120sec). I just changed the oil to Mobil one and replaced the A T fluid. The engine has 147000 miles. Would new plugs and wires be in order, or is this nothing to worry about?

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Unread 03-08-2013, 10:05 PM   #2
tj_nite
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Quote:
Originally Posted by andersoneric04 View Post
Hi guys I just bought a 2004 Jeep grand cherokee today. It has a straight six and sounded great a week ago when I test drove it. After driving it home today I noticed an intermitent slight shake during idle(appx every 30-120sec). I just changed the oil to Mobil one and replaced the A T fluid. The engine has 147000 miles. Would new plugs and wires be in order, or is this nothing to worry about?
mine does it all the time every 15-20 seconds 122000 miles inline 6 2001 never worried about it
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Unread 03-08-2013, 11:29 PM   #3
MuddyWJ
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Quote:
Originally Posted by tj_nite View Post

mine does it all the time every 15-20 seconds 122000 miles inline 6 2001 never worried about it
Mine too. L6 just are not as smooth as a V
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Unread 03-09-2013, 12:20 AM   #4
pinky2252s
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Quote:
Originally Posted by MuddyWJ View Post
Mine too. L6 just are not as smooth as a V
The V8's dont have a very smooth idle either haha.



The I6 just does that.
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Unread 03-09-2013, 05:50 AM   #5
soulsurvives
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i would not worry about changing the wires since you dont have any lol.....with that many miles i woulod do the plugs if you dont know when the last time they were changed.....i put a new coil pack on mine when i did the plugs but i dont think i needed it.....just did it so i wouldnt have to anytime soon......was about 120 for it tho....
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Unread 03-09-2013, 06:16 AM   #6
cjcyr8
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Congrats your purchase of a WJ 4.0. Mine just hit 147k...yep....It's not the smoothest engine, but it's damn near bullet proof.

Here is a tip about a common issue that causes misfires, hesitation, bucking electrical shorts etc...Check it out during your next tune-up to save future headaches:

Carefully check the fuel injector wiring harness; follow it from the front of the valve cover to the rear of the engine....There is a cylinder head stud/bolt head at the very back of the engine (drivers side behind valve cover) this stud/bolt head rubs through the harness, short circuits the wires and causes rough idle, bucking, misfires, hesitation and random codes. The symptoms sometimes begin after the engine is hot or has been running on the highway for awhile, and often come and go...It will take more than just a quick visual inspection....If the harness is resting upon this stud (or near it for that matter), if you don't allready have this problem eventually you will. I repaired the wire, wrapped the entire in harness in nylon loom, and put piece of vacuum hose over that stud...problems solved...

Click the link and scroll down for a picture taken by another member:
http://www.jeepforum.com/forum/f310/...issue-1488591/
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Unread 03-09-2013, 08:21 AM   #7
andersoneric04
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Thanks guys!
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