2 car issues after wreck
Thread Starter
Burning Brakes
Joined: Jul 2005
Posts: 982
Likes: 57
From: Charleston, SC South Carolina
2 car issues after wreck
1) The RPM's are floating. When driving on the interstate, car in cruise going 65 MPH. The RPM guage floats from 1400-1700 RPM's constantly. It almost feels like the car is going up/down a gear. It's never done this before. It happens when in "D", when i drop the car down into "M" which puts the car into 8th gear it stays pretty steady at 1500 RPM. So its only noticable in "D" when in cruise. I haven't really noticed it that much while driving not in cruise.
2) When i turn the wheel left or right in "D" or "R" there is a poping/knocking noise coming from the rear wheels. You don't have to turn the wheel all the way left or right to get it to do this. When it first happened i thought the front wheels were hitting the wheel well or scrubbing something but this is not the case. My unlce is a mechanic and says it could be that the grease in the rear end needs to be replaced. He also said it could be the positrack messing up. He said its like the back wheels are locking up and causing the poping noise. Its never done this before, ever.
The car is still under warranty so i'm going to make an appointment to take it in to get checked out this coming week. Just wondering if anyone on the site has had any issues similar. Thanks for the help.
2) When i turn the wheel left or right in "D" or "R" there is a poping/knocking noise coming from the rear wheels. You don't have to turn the wheel all the way left or right to get it to do this. When it first happened i thought the front wheels were hitting the wheel well or scrubbing something but this is not the case. My unlce is a mechanic and says it could be that the grease in the rear end needs to be replaced. He also said it could be the positrack messing up. He said its like the back wheels are locking up and causing the poping noise. Its never done this before, ever.
The car is still under warranty so i'm going to make an appointment to take it in to get checked out this coming week. Just wondering if anyone on the site has had any issues similar. Thanks for the help.
Melting Slicks
Joined: May 2012
Posts: 2,904
Likes: 315
From: Cedar Falls Iowa
Engine RPM sounds like classic A8 torque converter fail. As for the clicking sound, is it at low speed or do you hear it at any speed? Perhaps the diff needs a friction modifier tweak. Too much friction modifier, and Ive read an LSD will one wheel wonder. Not enough modifier and the diff makes clickety clack sounds during low speed sharp turns... Kinda like the sounds you hear from a worn out CV joint on a FWD car.
Pro
Joined: Jan 2009
Posts: 722
Likes: 19
From: Sebring Florida
1) The RPM's are floating. When driving on the interstate, car in cruise going 65 MPH. The RPM guage floats from 1400-1700 RPM's constantly. It almost feels like the car is going up/down a gear. It's never done this before. It happens when in "D", when i drop the car down into "M" which puts the car into 8th gear it stays pretty steady at 1500 RPM. So its only noticable in "D" when in cruise. I haven't really noticed it that much while driving not in cruise.
2) When i turn the wheel left or right in "D" or "R" there is a poping/knocking noise coming from the rear wheels. You don't have to turn the wheel all the way left or right to get it to do this. When it first happened i thought the front wheels were hitting the wheel well or scrubbing something but this is not the case. My unlce is a mechanic and says it could be that the grease in the rear end needs to be replaced. He also said it could be the positrack messing up. He said its like the back wheels are locking up and causing the poping noise. Its never done this before, ever.
The car is still under warranty so i'm going to make an appointment to take it in to get checked out this coming week. Just wondering if anyone on the site has had any issues similar. Thanks for the help.
2) When i turn the wheel left or right in "D" or "R" there is a poping/knocking noise coming from the rear wheels. You don't have to turn the wheel all the way left or right to get it to do this. When it first happened i thought the front wheels were hitting the wheel well or scrubbing something but this is not the case. My unlce is a mechanic and says it could be that the grease in the rear end needs to be replaced. He also said it could be the positrack messing up. He said its like the back wheels are locking up and causing the poping noise. Its never done this before, ever.
The car is still under warranty so i'm going to make an appointment to take it in to get checked out this coming week. Just wondering if anyone on the site has had any issues similar. Thanks for the help.
Safety Car
Joined: Sep 2001
Posts: 4,495
Likes: 1,263
From: Jacksonville FL
(1) Your torque converter is bad, need to take your car to a dealer whose changed TC's before. They are able to properly diagnose the problem. Do a search on the forum for "A8's and Torque Converter Failure" This Thread will give you other symptoms of a bad torque converter which you could have and not be aware of it. Your wreck has nothing to do with this problem.
(2) Was your car damaged in the rear end, you must have a damaged part in the rear. Have the dealer check it out or a mechanic you trust.
(2) Was your car damaged in the rear end, you must have a damaged part in the rear. Have the dealer check it out or a mechanic you trust.
Last edited by Red C8 of Jax; Dec 17, 2016 at 09:23 AM.
Pro
Joined: Sep 2014
Posts: 701
Likes: 179
From: Muskoka ontario
...........needs a new TC and with the rear end of the car torn out to replace the TC they can fix the other issue at the same time.
............a good dealer who has done these previously can do that job without doing any damage to the car at all, at least that has been my experience on two tranny tear outs. Good luck and hope you get it fixed soon and back on the road.
Seasons Greetings.
............a good dealer who has done these previously can do that job without doing any damage to the car at all, at least that has been my experience on two tranny tear outs. Good luck and hope you get it fixed soon and back on the road.
Seasons Greetings.
Tech Contributor
Joined: Oct 1999
Posts: 41,055
Likes: 9,817
From: Charlotte, NC (formerly Endicott, NY)
Also do you have a base car or one with the eLSD. The eLSD works differently than a standard LSD and maybe there was some damage to the unit due to the wreck.
Bill
Bill
Burning Brakes
Joined: Oct 2004
Posts: 752
Likes: 113
From: Charlotte NC
Lance,
Lance if I remember correctly your car is a Z51, which has the ELSD.
My guess on the differential is a cable that was damaged or not re-installed correctly during repairs.
I think that is a pretty minor repair. Can't comment on the A8, no knowledge of them at all.
George
Lance if I remember correctly your car is a Z51, which has the ELSD.
My guess on the differential is a cable that was damaged or not re-installed correctly during repairs.
I think that is a pretty minor repair. Can't comment on the A8, no knowledge of them at all.
George
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Verdad Gallardo
Le Mans Master
Joined: Dec 2003
Posts: 5,561
Likes: 448
From: Atlanta metro Ga.
Lance,
Lance if I remember correctly your car is a Z51, which has the ELSD.
My guess on the differential is a cable that was damaged or not re-installed correctly during repairs.
I think that is a pretty minor repair. Can't comment on the A8, no knowledge of them at all.
George
Lance if I remember correctly your car is a Z51, which has the ELSD.
My guess on the differential is a cable that was damaged or not re-installed correctly during repairs.
I think that is a pretty minor repair. Can't comment on the A8, no knowledge of them at all.
George
With the nighrmaee the OP has suffered, I hope he can get this resolved quickly and get into his new car ASAP.
Last edited by Dan_the_C5_Man; Jan 16, 2017 at 12:27 AM.
Melting Slicks
Joined: Aug 2014
Posts: 2,746
Likes: 916
According to the TSBs that I've seen regarding the torque converter, some RPM fluctuation is normal. If it is bucking/shuddering then you have a torque converter failure. If you don't feel the fluctuations, I suspect that they won't touch your torque converter...
Last edited by lakemg; Jan 16, 2017 at 12:05 PM.
