Loud Continues Pop Under Acceleration; Read what I've Done, still need help - JeepForum.com

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post #1 of 22 Old 08-03-2013, 04:25 PM Thread Starter
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Loud Continues Pop Under Acceleration; Read what I've Done, still need help

Some back story: Last month I went wheeling with a friend, got my jeep stuck in a mud pit for around 30 minutes, got it pulled out and went on being happy. On the drive home my Jeep was feeling sluggish, as if it had a loss of power. When I got it home I changed front and rear differential fluids, and also changed the Trans fluid and filter, as all of these were under water. I didn't find any considerable amount of metal shavings in either axle or in the transmission. Also after this the transfer case began to leak at the rear main output for the drive shaft. I continued to drive the Jeep for the next few weeks. I went out of town for awhile leaving the Jeep parked in the garage.

When I came back and drove it I began to experience a loud continues popping sound, that seamed to be coming from the front end. I wasn't sure what was making the sound. I figured it was either;

1. Drive shaft
2. Transfer Case (I have the infamous NP249)
3. Differential

I pulled both drive shafts and inspected them. Replaced the front drive shaft u-joint:


I also replaced the rear seal on the transfer case while I was at it. Just finished this today, put it all back together and test drove it, still same popping sound.

One thing I did notice on the rear drive shaft was that the rear slip yoke had one chipped spline. I can't seam to find any way to replace that part except a junkyard.

So basically I'm just looking for any ideas of what else to check, I'm out of work atm and can't afford many new parts. I'm thinking I'm going to try changing the t-case fluid and re-filling, see if maybe it's messed up. I might also try and find a new rear drive shaft slip yoke. Any ideas of something I haven't thought of?

EDIT: Something I forgot to mention, the cv axle shafts in the front are both visually okay, no tears in the boots. Drivers side one was replaced around 5,000 miles ago, not sure about the passenger side.


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post #2 of 22 Old 08-04-2013, 12:21 PM Thread Starter
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Bump for help!

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post #3 of 22 Old 08-04-2013, 04:47 PM
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Double bump for ya bro!

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post #4 of 22 Old 08-13-2013, 12:47 PM Thread Starter
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Made a video

Here's a video of the sound, still no-one?


Man it's times like these I really wish Ratmonkey was here, he'd know what do do...

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post #5 of 22 Old 08-13-2013, 04:13 PM
JasonStebbins
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The sound quality in that video is kind of deceiving. Sounds more like under hood noise rather then suspension. Fan hitting the shroud? Exhaust flowing freely? Ignition parts in good shape? You said it felt sluggish under acceleration so maybe the TPS? Mine sputtered/misfired when I goosed it from a stop when my TPS went out.

If everything else has checked out I would vote CV axle on the passenger side.

Poop
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post #6 of 22 Old 08-13-2013, 05:34 PM
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Mine makes a noise similar to that if I give it over 2/3 throttle from a dead stop. Initially I thought it was the fan hitting the shroud but now I'm not so sure. It doesn't sound as loud as yours though.
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post #7 of 22 Old 08-13-2013, 06:10 PM
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Popping sounds from the middle of the Jeep, while accelerating, is most commonly a stretched transfer case chain. In 4low, while climbing a steep hill or obstacle, you or a helper will see the T-Case jump at the same time it makes the noises.

.

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post #8 of 22 Old 08-15-2013, 03:01 PM Thread Starter
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Quote:
Originally Posted by JasonStebbins View Post
The sound quality in that video is kind of deceiving. Sounds more like under hood noise rather then suspension. Fan hitting the shroud? Exhaust flowing freely? Ignition parts in good shape? You said it felt sluggish under acceleration so maybe the TPS? Mine sputtered/misfired when I goosed it from a stop when my TPS went out.

If everything else has checked out I would vote CV axle on the passenger side.
I don't think it's the fan, but I will for sure check to make sure.

I know I need to do a tune up on the plugs and wires and pretty much everything, so maybe I will do that now to see if it helps.

I'll check the Tps the best I can. I don't think it does it in neutral, which is why I was thinking it was some sorta of suspension part and not the engine, thought when I get home I will rev it up in neutral and see if it is the engine.



Quote:
Originally Posted by CJ7-Tim View Post
Popping sounds from the middle of the Jeep, while accelerating, is most commonly a stretched transfer case chain. In 4low, while climbing a steep hill or obstacle, you or a helper will see the T-Case jump at the same time it makes the noises.
This is kinda what I've been thinking, I'll have a friend drive it in my yard, we've got a few things I can have him climb in low, I'll check and see if the case moves with the popping.


Thanks for the input guys! I'm on vacation right now and didn't bring the Jeep, I'll check out all of these things and come back with the results and we'll see how much money I have to spend!

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post #9 of 22 Old 08-15-2013, 03:25 PM
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Spending money.... Its a jeep thing xD hahaha

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post #10 of 22 Old 08-19-2013, 09:54 PM Thread Starter
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More diagnosing, starting to look like gears or spline? (video)

Alright guys I'm back, I took CJ7-Tim's advice and had my friend drive it around in low over a small bump to replicate the sound. I tried recording it but didn't get much on the recording, I cut it down to all that was usable and it's three seconds long.


As I watched the t-case it didn't seam to 'jump' as I expected it too, to me it looked more as if the splines (or gears, not exactly sure how these 249s are put together) were messed up on the front driveshaft output.

I know for sure the sound is coming from the transfer-case area, I'm thinking I may just need to drop the case out and disassemble it to find the root of the problem. Any ideas of another way to diagnose the problem before I disable my daily?

Also, on a side note, I've realized that this problem is my fault, as when the case started leaking, I didn't do anything about it. I let it leak for almost a month as I didn't have a 30mm socket to check the fluid level. So today I finally got the 30mm socket (I had to order it), I went and finally changed the fluid in the case. When i drained the old fluid, I was upset with myself to find was almost bone dry! Damn how stupid am I?? So basically I just screwed myself because I was too lazy to buy a socket!

:

Oh well, live and learn right?

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post #11 of 22 Old 08-20-2013, 07:45 AM
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Quote:
Originally Posted by Myusername1674 View Post
Oh well, live and learn right?
Hopefully. I've met a lot of people that repeat the same mistakes.
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post #12 of 22 Old 08-20-2013, 08:52 AM
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On my 96 4.0 I had bought the 6-pt 30mm impact socket (not that I'd use an impact) some years for checking the fluid in my 242. I even ground the inside beveled nose off the socket so it would fit tight up against the case in removing the thin bolt-head plugs.

Only had a very slight leak in the TC and I was good about checking the fluid level once in a while. Then the rubber plug blew out of the top of the case and slung all the fluid out of it before I even knew it. Was disheartened to see the fluid slung all over the bottom of the unibody and in checking/draining the fluid there was just a little bit in it full of metal shavings. With no lubrication the chain had stretched and ate up the inside of the case. Cost me $275 for a jy shelf unit 242 with a 60-90 day warranty. Hope this isn't your problem and just thought I'd pass it along.
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post #13 of 22 Old 08-20-2013, 03:34 PM Thread Starter
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Alright got out today and taped my phone to the underneath of my Jeep. My plan is to tear into the Jeep next week, maybe this weekend.

At 0:48 you can see the driveshaft kinda 'jiggle' as the truck pops a few times.


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post #14 of 22 Old 08-20-2013, 07:21 PM
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That's a great idea taping your phone under there and great video w/sound! Whatever that juttering is it doesn't look very good.
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post #15 of 22 Old 08-21-2013, 11:18 AM
CJ7-Tim
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At about 1:47 you can hear two snaps, and see the t-case move in a different direction. I suggest checking the chain.

.

A recent Gallup public opinion poll shows the NRA, at 58% approval, has a higher approval rating than either Hillary Clinton or Barack Obama.

Progressive Liberalism: Bringing you new Healthcare ideas so wonderful, they have to include mandatory participation ...

Originally Posted by Ronald W. Reagan: Government is not the solution to our problems; Government is the problem.
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