single POP in the front while taking off from a stop - JeepForum.com

 
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post #1 of 10 Old 06-16-2013, 03:14 PM Thread Starter
avbcon12
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single POP in the front while taking off from a stop

So I've been having this happen the past 2 months with my 99 5spd xj. When I take off from a stop I get one solid pop sound (and feel) in the front end. Feels/sounds like the passenger side. No rattle over bumps either, other than this noise it feels really solid/tight.

Things that have been replaced:
Sway bar end links and mount 2 weeks ago
U-Joints and wheel bearings a year ago
Brake pads/ rotors a year ago

I have tried to come to a stop without using the brakes then taking off to rule out a caliper binding/freezing. Still pops so I don't think its brake related.

Any thoughts?


99 XJ 5spd 4.0l
00 XJ auto 4.0l
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post #2 of 10 Old 06-16-2013, 05:32 PM
aircruiser
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How loud is the pop? I am assuming if you can feel it it is significant. Have you checked the front driveshaft u-joint and the splines in that? Control arm bushings?

1996 XJ on 36" TSLs, 4", locked F/R, stretched
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post #3 of 10 Old 06-16-2013, 07:34 PM Thread Starter
avbcon12
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Yeah, pretty loud. As if someone took a ball peen hammer and smacked an anvil. I haven't checked or replaced the control arms but I'd imagine that is.hear them over bumps/ loose feeling/sounding when the suspension articulates. I get none of that.

99 XJ 5spd 4.0l
00 XJ auto 4.0l
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post #4 of 10 Old 06-16-2013, 09:30 PM
aircruiser
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True I wouldnt rule it out however, my old ZJ had a problem like that and the bushings had eaten themselves backwards if that makes sense. So up and down there was no clunk but front to back it could move. I would also check motor mounts as well

1996 XJ on 36" TSLs, 4", locked F/R, stretched
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post #5 of 10 Old 06-17-2013, 05:34 AM Thread Starter
avbcon12
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Good point.

I forgot to mention that the engine and trans mounts were replaced a year ago.

Thanks, keep them coming!

99 XJ 5spd 4.0l
00 XJ auto 4.0l
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post #6 of 10 Old 06-17-2013, 07:45 AM
miceanic
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1990 XJ Cherokee 
 
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Control arms, mine does it now. The upper bushing in the drivers side of the axle mount has worked itself out (1/4 to the drivers side) I dont want to change it now but will have to soon. Good luck changing them, they suck!
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post #7 of 10 Old 06-17-2013, 09:15 AM
biffgnar
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Check the track bar axle side (passenger side where you are hearing it).

#feelthejohnson
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post #8 of 10 Old 06-19-2013, 05:37 AM Thread Starter
avbcon12
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The track bar seems fine, bushing isn't cracked and bolt is tight. The control arm mounts are all tight but the rubber is a bit cracked. No excessive movement in any of them.

99 XJ 5spd 4.0l
00 XJ auto 4.0l
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post #9 of 10 Old 06-19-2013, 06:44 AM
RLE
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Do you have any vibrations at highway speed? What happens if you hit a
small bump going 55mph?

Does it make the noise when you back up, too?

The motor mounts were changed a year ago but are all the bolts tight?

Was the front end jacked up and the suspension hanging free when you
checked for play in the control arm bushings? If the upper bushings haven't
been changed for awhile, I would suspect them. Mine had no play when I would
grab them with the Jeep on the ground but the uppers were in fact bad.

If it happens whenever you take off from a stop, have a buddy lie on the
ground next to the right front and listen/look for something moving. Maybe
you can more positively identify the area it is coming from.
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post #10 of 10 Old 06-23-2013, 03:13 PM
dkeller
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1998 XJ Cherokee 
 
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I had the same symptoms.Park on a hill and have a buddy watch the front end.Roll back a foot or so and hit the brakes.Do it rolling backwards and forwards.This was the only way I could see my bad control arm bushings. You could actually see the axel shifting when I did this.
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