Strange Noise/Vibration Identification
Thread Starter
Instructor
Joined: Feb 2011
Posts: 142
Likes: 24
From: Houston Texas
Strange Noise/Vibration Identification
Hi Guys,
I need some input on a strange noise/vibration I am getting in my '01 coupe (A4) with 94,000 miles.
When I come to a stop (ie: redlight) I am hearing a strange vibration coming from what feels like the driveline and towards the rear of the car. I can also feel a slight thump which is in sync with the vibration being transmitted through the brake pedal. If I let off the brakes and let the car creep forward the vibration/noise almost goes away. It happens mostly when the car is hot.
Does anyone have any ideas on what this is?
I need some input on a strange noise/vibration I am getting in my '01 coupe (A4) with 94,000 miles.
When I come to a stop (ie: redlight) I am hearing a strange vibration coming from what feels like the driveline and towards the rear of the car. I can also feel a slight thump which is in sync with the vibration being transmitted through the brake pedal. If I let off the brakes and let the car creep forward the vibration/noise almost goes away. It happens mostly when the car is hot.
Does anyone have any ideas on what this is?
Racer
Joined: Nov 2008
Posts: 253
Likes: 13
From: Clearwater Florida
From what the OP stated, I believe it is when he is stopped. I have a similar sound/vibration also. Almost like the exhaust may be loose. I haven't had a chance to check it recently. I did read on here about some sort of spring near the exhaust that may be vibrating. I will have to search for the thread. 
edit**found it
edit**found it
Finally had a few minutes to look at what the heck was rattling under the car today. The rattle was the typical decelerating rattle coming from the exhaust. I put it up on the lift and put this fix in....
1) pic of the offending rattle. The springs here rattle against their hangers. You can tell just by shaking the exhaust here and it will sound like a storm door on farm house.
2) Got these springs at lowes for 2 bucks. They are very tight and will be used to hold the two H pipe springs together.
3) You have to unbolt the springs to put the holder spring on.
4) Put the sping on the lowest coil, and hand thread the bolts.
5) Tighten them down to 37lbs, and you will be rattle free.
I ran this car for a few miles and have noticed NONE of the rattles that were there before.
Hope that helps....
1) pic of the offending rattle. The springs here rattle against their hangers. You can tell just by shaking the exhaust here and it will sound like a storm door on farm house.
2) Got these springs at lowes for 2 bucks. They are very tight and will be used to hold the two H pipe springs together.
3) You have to unbolt the springs to put the holder spring on.
4) Put the sping on the lowest coil, and hand thread the bolts.
5) Tighten them down to 37lbs, and you will be rattle free.
I ran this car for a few miles and have noticed NONE of the rattles that were there before.
Hope that helps....
Last edited by GoBallsDeep!; May 20, 2011 at 11:12 AM. Reason: found it
Thread Starter
Instructor
Joined: Feb 2011
Posts: 142
Likes: 24
From: Houston Texas
Brakes are brand new and working perfectly. I actually had the problem before I changed the brakes. The vibration/thumping feeling is only when I am at a complete stop. It is a constant "rythemic" knocking feeling.
It almost feels like something is caught on the driveshaft and knocking against the body of the car (which I know is not the case). Can I shake the exhaust to test the little retainer springs to see if they are shot?
It is very weird I only get this problem when I am stopped but when I left off the brake pedal and let the car creep it subsides.
It almost feels like something is caught on the driveshaft and knocking against the body of the car (which I know is not the case). Can I shake the exhaust to test the little retainer springs to see if they are shot?
It is very weird I only get this problem when I am stopped but when I left off the brake pedal and let the car creep it subsides.
Thread Starter
Instructor
Joined: Feb 2011
Posts: 142
Likes: 24
From: Houston Texas
Unfortunatley thats what I think the problem is. I am hoping it holds together until the fall when I hope to have the drivetrain down for a TC and 3:73 gears.
My theory is that the coupler is getting weak and when its hot the rubber is deforming and brushing against something causing the vibration/thumping noise.
Has anyone purchased the polyurethane couplers from any of the forum vendors? Any feedback on them would be appreciated. I have read plenty about the BMW, LG aluminum, and stock rubber couplers already but haven't heard much on the poly ones.
My theory is that the coupler is getting weak and when its hot the rubber is deforming and brushing against something causing the vibration/thumping noise.
Has anyone purchased the polyurethane couplers from any of the forum vendors? Any feedback on them would be appreciated. I have read plenty about the BMW, LG aluminum, and stock rubber couplers already but haven't heard much on the poly ones.
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