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Old 09-10-2016, 09:19 AM   #1
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Clunk and shutter when accelerating

My '02 GT has a clunk coming from the rear. It usually happens when accelerating from a stop or from a slow speed. It will happen occasionally when driving slowly, under 20 mph. It happens when coasting over bumps also.

The only rear changes I've made are replacing the LCAs and axle bearings/fluid. I believe the u-joints are good. I suspect the shocks, but when I press down on the trunk, I can't replicate the clunk and the car returns to 'still' immediately. The shocks are not leaking or damaged, either.

Any ideas? Thanks.


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Old 09-10-2016, 10:07 AM   #2
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Check the torque on the LCAs.
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Old 09-10-2016, 10:24 AM   #3
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The LCAs have poly bushings. If that helps.


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Old 09-10-2016, 11:19 AM   #4
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The LCAs have poly bushings. If that helps.


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Old 09-10-2016, 01:58 PM   #5
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My car makes some clunking noises as well. I have determined that it is likely caused by the slop in the 100k+ miles drivetrain.
I'm not going to worry about it unless it gets worse, or something breaks.
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Old 09-10-2016, 02:14 PM   #6
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Have you actually confirmed the u-joints are ok? The symptoms you describe are classic for that. You can check by forcefully rotating it by hand with the trans in gear (if a manual) or park if an auto and the e-brake on. Try up and down movement on the shaft especially on the pinion end. Easy enough to take the joints apart and confirm and probably one of the least expensive parts to replace if you are able to do it yourself. If you can get it on a lift you can also get a hoist jack under the engine and lift a bit to see if you have a broken motor mount.
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Old 09-10-2016, 02:32 PM   #7
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I'd say I can confirm the u-joints are good. However, that was not with a tough 'test.' The car (M5) has 131k and it's time to change those anyway. However, the clunks seam to be coming from the sides (I should have said that in the first comment). The car makes the clunk even when coasting. So, I would think this is not a u-joint issue.


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Old 09-10-2016, 04:14 PM   #8
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That is indeed a mystery and does not sound like a u-joint if it is apparent at coast. I would be curious to know what you figure out.
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Old 09-11-2016, 07:37 PM   #9
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the little brackets for the e brake cables. did you secure them to the sway bar bolt? or leave them loosey goosey with a couple zip ties like i did?
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Old 09-12-2016, 12:37 AM   #10
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Have you actually confirmed the u-joints are ok? The symptoms you describe are classic for that. You can check by forcefully rotating it by hand with the trans in gear (if a manual) or park if an auto and the e-brake on. Try up and down movement on the shaft especially on the pinion end. Easy enough to take the joints apart and confirm and probably one of the least expensive parts to replace if you are able to do it yourself. If you can get it on a lift you can also get a hoist jack under the engine and lift a bit to see if you have a broken motor mount.
^^^^ This...
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Old 09-12-2016, 12:21 PM   #11
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yea
Let me guess... You are trying to get enough posts to either post in the classifieds, or get the forum AM discount.
Yea?
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Old 09-12-2016, 12:24 PM   #12
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Let me guess... You are trying to get enough posts to either post in the classifieds, or get the forum AM discount.
Yea?
I'm thinking troll or bot. Regardless, it's irritating. I want to block him, but I'm not a mod. Hmmm



Yea
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Old 09-12-2016, 12:35 PM   #13
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I'm thinking troll or bot. Regardless, it's irritating. I want to block him, but I'm not a mod. Hmmm



Yea

Yeah. Know the feeling.

Hope he's not trying to hit his 50 posts lol


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Old 09-14-2016, 08:47 PM   #14
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Yea

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Old 09-26-2016, 01:02 PM   #15
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Felix, yes, I can verify that the e-brake cables are attached correctly. I've ordered a pair of shocks. Since, I can't determine the cause, I'm left with replacing parts until I solve the problem. I'll let you know what happens.


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Old 10-04-2016, 01:02 PM   #16
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Just changed the shocks. Same clunk and shutter still happening. Argh!


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Old 10-06-2016, 08:16 PM   #17
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So, I removed the quad shocks. No more clunk or shutter! Yippee!


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Old 10-07-2016, 12:29 AM   #18
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Interesting. We're they the old factory ones?

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Old 10-07-2016, 12:48 AM   #19
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Interesting. We're they the old factory ones?

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Ditto^^^. How does the the car feel/launch without them?
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Old 10-07-2016, 01:05 AM   #20
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With his replaced lower arms, it should launch just fine without them. Sometimes they recommend removing them just because they become pointless. Didn't think they would cause an issue like this.

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Old 10-07-2016, 09:02 AM   #21
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These were the old factory quads. One had dried grease all over it. The other did not extend fully when I pulled on it.

The car is very smooth, now, without the quads, when launching. Big surprise what an affect the old quads had. I'm thinking that it might be good to put new ones on now that I know the poor effect the old ones did. I'll drive it a few days, then, decide.

After changing the 'regular' shocks a few days ago, I've been surprised at how quiet the car has been, too.

I've had trouble since I bought the car 3 1/2 years ago with wearing out rear tires. I've been getting around 8,000 miles out of each set. I wonder how much of that excessive wear has been, simply, from these four bad shocks. I drive the car easy, too. No burn outs, spins, hard cornering or launches.


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Old 10-07-2016, 09:06 AM   #22
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These were the old factory quads. One had dried grease all over it. The other did not extend fully when I pulled on it.

The car is very smooth, now, without the quads, when launching. Big surprise what an affect the old quads had. I'm thinking that it might be good to put new ones on now that I know the poor effect the old ones did. I'll drive it a few days, then, decide.

After changing the 'regular' shocks a few days ago, I've been surprised at how quiet the car has been, too.

I've had trouble since I bought the car 3 1/2 years ago with wearing out rear tires. I've been getting around 8,000 miles out of each set. I wonder how much of that excessive wear has been, simply, from these four bad shocks. I drive the car easy, too. No burn outs, spins, hard cornering or launches.


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I don't think the shocks had anything to do with wear... Maybe that heavy foot on launches did ;D lol... Does the car get wobbly without the quads???
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Old 10-07-2016, 09:09 AM   #23
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It hasn't felt wobbly or maybe, I just haven't recognized a wobble. I have wondered if I would feel a wobble since some people have commented that they did.

I'll drive a few days and give a better 'wobble' report.


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Old 10-07-2016, 09:12 AM   #24
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It hasn't felt wobbly or maybe, I just haven't recognized a wobble. I have wondered if I would feel a wobble since some people have commented that they did.

I'll drive a few days and give a better 'wobble' report.


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Thanks lol, I know my car is probably a lot lower than you (barely any travel haha) I might take mine off this weekend..
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Old 10-07-2016, 09:15 AM   #25
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Mine is mostly stock. I do have tubular LCAs, but the car is not lowered.


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Old 10-07-2016, 09:19 AM   #26
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Mine is mostly stock. I do have tubular LCAs, but the car is not lowered.


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Oh ok, no I have KW coil overs. with front tubular control arms.. I'm no longer into speeding around after a blown engine lol.. low and slow makes my day go by
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Old 10-07-2016, 09:25 AM   #27
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Ha! 'Low and slow' very funny.

I've tracked fuel mileage since I bought it... 22.8 mpg combined city/hwy..... Yes, it is a GT.


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Old 10-07-2016, 09:30 AM   #28
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Ha! 'Low and slow' very funny.

I've tracked fuel mileage since I bought it... 22.8 mpg combined city/hwy..... Yes, it is a GT.


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On prem? I avg about 19mpg or so. CAI, 75mm throttle body, 60lb injectors, x pipe, and some other crap
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Old 10-07-2016, 09:38 AM   #29
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I'm stock... No CAI, either. Regular gas.



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Old 10-07-2016, 09:42 AM   #30
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I'm stock... No CAI, either. Regular gas.



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Hmm, I can't run regular gas for some reason car runs crappy lol. very boggy
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Old 10-07-2016, 09:47 AM   #31
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I do have Flowmaster 40's. Forgot that one. Love the sound, too.

I have some of the typical replacements such as COPs, brake calipers, bullet wheels (staggered), etc.



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Old 10-07-2016, 09:50 AM   #32
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I do have Flowmaster 40's. Forgot that one. Love the sound, too.

I have some of the typical replacements such as COPs, brake calipers, bullet wheels (staggered), etc.



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Same here, Hmm I gotta get to work on my car this weekend lol.. brake lights stop working intermittently when pressing brakes.. The smell of gas smell also intermittent D:
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Old 10-07-2016, 03:31 PM   #33
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Good luck with both projects! Both of those problems can have dangerous outcomes.


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Old 10-07-2016, 03:37 PM   #34
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Good luck with both projects! Both of those problems can have dangerous outcomes.


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Brake lights i'm just assuming its a loose connection lol.. and the fuel smell I believe its the breather valve under the passenger wheel well
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Old 10-08-2016, 08:53 AM   #35
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Ha! 'Low and slow' very funny.

I've tracked fuel mileage since I bought it... 22.8 mpg combined city/hwy..... Yes, it is a GT.


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I've seen as low as 12, heavy foot. Also seen as high as 29, coming back from Mustang Week. Cruise set at 70. Mostly stock. Tune, and catless exhaust. 93
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