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Unread 03-06-2009, 10:22 PM   #1
ZJeepMI
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'95 ZJ Front End Pop

I drove my ZJ for the second time since I bought it a few months ago (working on repairing a broken door latch) and I noticed a pretty serious noise.

Under heavy acceleration off the line a loud pop comes from the right front. It only does this off the line 1/2 throttle or more and the pop only occurs once.

Any ideas on what I should check?

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2001 TJ Wrangler, 2.5l, 5 speed, Stock.
Previous Jeeps:
'98 XJ, 3.5" lift, 31" BFG A/T, Aussie Locked D30 with Alloy Shafts, 8.25 rear, SYE, Skids, JCR Front bumper, Roof Rack
1995 Jeep Grand Cherokee, 2" lift, 31's, V8, NP242...
1993 Jeep Grand Cherokee, Stock, 230K miles.
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Unread 03-06-2009, 10:56 PM   #2
Virmagicus
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Check the front suspension first. Have someone turn the wheels back and forth and visually inspect for movement in the upper/lower TB. Also shake the front end from side to side....any popping? Make sure to also check the TRE's & SB bushings. Will this pop reoccur if you turn the wheel back and forth while idling ? If there were multiple pops it could be another issue.
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Unread 03-07-2009, 01:45 AM   #3
newfieZJ
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CV joint , little doubt from the descrption , heard it a zillion times on FWD cars
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Unread 03-07-2009, 12:03 PM   #4
ZJeepMI
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Quote:
Originally Posted by newfieZJ View Post
CV joint , little doubt from the descrption , heard it a zillion times on FWD cars
If a CV joint is bad isn't the boot ripped, or is that just sometimes?


Thanks for your help guys, I will check the suspension and the CV tomorrow, it is cold and rainy today
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2001 TJ Wrangler, 2.5l, 5 speed, Stock.
Previous Jeeps:
'98 XJ, 3.5" lift, 31" BFG A/T, Aussie Locked D30 with Alloy Shafts, 8.25 rear, SYE, Skids, JCR Front bumper, Roof Rack
1995 Jeep Grand Cherokee, 2" lift, 31's, V8, NP242...
1993 Jeep Grand Cherokee, Stock, 230K miles.
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Unread 08-06-2009, 08:50 PM   #5
ZJeepMI
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Alright guys, i'm resurrecting a thread I forgot about. I still need some help on this, it is pretty much the only problem my Jeep has right now.

Anyway, the popping has gotten much worse. I made a trip to the sand dunes(5 hour drive one way) a while back and on the way there it got so bad that is was popping under even the slightest throttle. But, then later after the Jeep cooled down, I got in to go to the dunes and it was back to only popping under heavy acceleration. Does this make any sense?

So, that got me thinking, maybe it is the transfer case? It has leaked a lot of fluid in the last two week(I have not been driving it), it binds pretty bad especially after long drives... Has anybody heard of a NP249 doing this?

The suspension seems tight, control arms are not visually bad or loose at all. I changed the front right CV joint and it almost seemed like the noise went to the other side but I can't really tell, it is too loud. I also replaced the track bar with a good one.

Annnddd, the drive shaft feels tight, but I suppose the CV could be bad in the driveshaft.

I don't know guys, i'm stumped... Any ideas?
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2001 TJ Wrangler, 2.5l, 5 speed, Stock.
Previous Jeeps:
'98 XJ, 3.5" lift, 31" BFG A/T, Aussie Locked D30 with Alloy Shafts, 8.25 rear, SYE, Skids, JCR Front bumper, Roof Rack
1995 Jeep Grand Cherokee, 2" lift, 31's, V8, NP242...
1993 Jeep Grand Cherokee, Stock, 230K miles.
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Unread 08-07-2009, 01:45 AM   #6
Virmagicus
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It now seems that there is slack in the chain inside the TC.
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Unread 08-07-2009, 02:48 AM   #7
newfieZJ
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Your t-case is a 249 , very common are worn VC's . When worn , this sealed clutch pack binds when warmed up . Because your issue seems effected by temp . I got to say that's your issue . Mechanical gears , joints etc etc when bad , don't change symptoms .

You have a late production 95 if you have a CV frt drive shaft , it wouldn't surprise me if the popping is from that from what you say . It's symptoms are effected by the power transfer via your worn VC .
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Unread 08-07-2009, 09:37 AM   #8
ZJeepMI
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Thanks guys, i'm out of town right now without the Jeep but when I get home I will pull the front driveshaft. If the noise is still there then I know what it is.
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2001 TJ Wrangler, 2.5l, 5 speed, Stock.
Previous Jeeps:
'98 XJ, 3.5" lift, 31" BFG A/T, Aussie Locked D30 with Alloy Shafts, 8.25 rear, SYE, Skids, JCR Front bumper, Roof Rack
1995 Jeep Grand Cherokee, 2" lift, 31's, V8, NP242...
1993 Jeep Grand Cherokee, Stock, 230K miles.
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