Weird popping noise

falcon556 · Apr 17, 2008

I get a popping noise from my drivetrain as I slowly go to a stop.
I only happens once every so often and I don't see any pattern.
Jacked it up, looked around, Ujoints good, tires rotate freely,
Ran it on jacks no noise.
Any ideas?

Wiser · Apr 17, 2008

falcon556 said:
I get a popping noise from my drivetrain as I slowly go to a stop.
I only happens once every so often and I don't see any pattern.
Jacked it up, looked around, Ujoints good, tires rotate freely,
Ran it on jacks no noise.
Any ideas?

your driveshafts, you need an sye...wut lift r u running?

Mudderoy · Apr 17, 2008

I started hearing this about a year ago. Only happened when in 4x4, and only after about 15 minutes of driving. Changed all the u-joints on the drive shafts (3), no change.

Recently found out the fluid level was low in the NP242 t-case, 4x4 won't engage anymore. I think it was the NP242 making the poping noise, maybe the chain after the transfer case got hot.

falcon556 · Apr 17, 2008

Anthony's_98_XJ said:
your driveshafts, you need an sye...wut lift r u running?

No lift, driveshafts good.

falcon556 · Apr 17, 2008

muckleroy said:
I started hearing this about a year ago. Only happened when in 4x4, and only after about 15 minutes of driving. Changed all the u-joints on the drive shafts (3), no change.

Recently found out the fluid level was low in the NP242 t-case, 4x4 won't engage anymore. I think it was the NP242 making the poping noise, maybe the chain after the transfer case got hot.

It only does it as I slowly come to a stop, OK at every speed 2x2 or 4x4.
My TC is a 242, oil good, smooth getting in and out of 4x4, I'd be very surprised if there was something wrong with it.

Timber · Apr 17, 2008

Loose control arm bolts or bad control-arm bushings?
EDIT: Nevermind; I reread that you said drivetrain noise.

Muad'Dib · Apr 17, 2008

I have this same problem... i have been told its either the trackbar bolts are loose, (which i know arent cause i checked them), or the UCA/LCA bushings are shot... which in my case i think is whats going on because if you look at them they are cracked.

XJ Stryker · Apr 17, 2008

Motor mounts, tranny mount. Mine are shot and i get vibration at a low idle.

jeep pox · Apr 17, 2008

idk what you wheel but my cherokee used to do that sometimes still does but it lessened alot when i pulled out the pitch shims from under the leafs and retightened all my suspension. also try greasing up everything.

Dmanti · Apr 17, 2008

Lube up the slip-yoke on the rear drive-shaft?

tsill · Apr 17, 2008

is it an actual pop sound or weight shifting? my experience is ujoints for a pop and trans/motor mounts for weight shifting. how many miles you have?

frank36 · Apr 17, 2008

Dmanti said:
Lube up the slip-yoke on the rear drive-shaft?

x2

falcon556 · Apr 17, 2008

Dmanti said:
Lube up the slip-yoke on the rear drive-shaft?

I can feel a little binding on the slip yoke and plan to lube it soon but, I don't think it gives my the popping noise.

falcon556 · Apr 17, 2008

tsill said:
is it an actual pop sound or weight shifting? my experience is ujoints for a pop and trans/motor mounts for weight shifting. how many miles you have?

As I slow down it may pop once or a few times, when I get multiple pops they feel like they are synchronized to the turning of the drivetrain/wheels. I thought it it might be the brakes, checked, nothing unusual.

falcon556 · Apr 17, 2008

tsill said:
is it an actual pop sound or weight shifting? my experience is ujoints for a pop and trans/motor mounts for weight shifting. how many miles you have?

167K
This weekend I'll do a lot more checking including items you gentlemen mentioned, honestly, I don't think we have found the problem yet.

88 Wagonman · Apr 17, 2008

Mine did the same thing and it turned out to be the motor mount. Apply the parking brake, put it in gear, apply the service brakes and hit the gas, if it is a mount, you will hear it. If you do hear it, have someone watch under the hood as you do it to help narrow it down.

falcon556 · Apr 17, 2008

88 Wagonman said:
Mine did the same thing and it turned out to be the motor mount. Apply the parking brake, put it in gear, apply the service brakes and hit the gas, if it is a mount, you will hear it. If you do hear it, have someone watch under the hood as you do it to help narrow it down.

I checked the mounts under the hood recently, I'll check them again along with the third mount.

88 Wagonman · Apr 17, 2008

I checked the mounts under the hood recently, I'll check them again along with the third mount.

Mine looked like brand new, but the rubber had seperated and I could not tell until I put the motor under a load. Third mount can be checked the same way, and very possibly the source of your trouble. Happy hunting:eeks1:

falcon556 · Apr 17, 2008

88 Wagonman said:
Mine looked like brand new, but the rubber had seperated and I could not tell until I put the motor under a load. Third mount can be checked the same way, and very possibly the source of your trouble. Happy hunting:eeks1:

Thanks.

bassfishinXJ · Apr 17, 2008

have you checked the fluid or changed it in your diffs?

Weird popping noise

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