Martin in Bellevue
02-25-2004, 11:36 AM
About a week ago, a (tire?) noise got loud. Jeff borrowed the car & called it tire noise; I mentioned nothing about noise to him beforehand. It is directly proportional to car speed, being loudest at about 40 mph. After 40, it seems to quiet down. The noise seems to be coming from the front half of the car.
What I've done:
I took the turbine fan covers off the m5 wheels looking for debris.
I replaced the 3 month old Yoko es100's with Db 2's last Monday. The Db's are a little quieter, but the hum is still there. Discount Tire was very cool about this, giving full credit on the es100's towards the new tires. I had a guy go along around the block & he agreed the noise was tires.
I took plastic covers from behind headlights away & the duct to alternator apart last night looking for any cause.
I also cleaned up the caliper carrier bolts & saw no relief.
The front accessory fan spins freely. With the front end on jackstands, the wheels seemed to spin freely.
The backing plates aren't touching the brake rotors.
I replaced the front wheel bearings last year. The noise sounds alot more like loud tires than anything else I can think of.
I checked the heat shields under the car. This includes the shields over the control arms, catalytic, & the big heat shield over the center of driveshaft.
The guibo & center driveshaft mount looked good.
What I can do without better diagnostic skills:
Swap in the new 3.64lsd.
Swap in the driveshaft from that parts car. The rear cv joint in the original driveshaft could fail causing such a noise? I thought they clicked to death.
Swap in the front strut assemblies & the different wheel bearings from the parts car.
Could a bearing have gone in the 5 speed manual gearbox causing this?
What I've done:
I took the turbine fan covers off the m5 wheels looking for debris.
I replaced the 3 month old Yoko es100's with Db 2's last Monday. The Db's are a little quieter, but the hum is still there. Discount Tire was very cool about this, giving full credit on the es100's towards the new tires. I had a guy go along around the block & he agreed the noise was tires.
I took plastic covers from behind headlights away & the duct to alternator apart last night looking for any cause.
I also cleaned up the caliper carrier bolts & saw no relief.
The front accessory fan spins freely. With the front end on jackstands, the wheels seemed to spin freely.
The backing plates aren't touching the brake rotors.
I replaced the front wheel bearings last year. The noise sounds alot more like loud tires than anything else I can think of.
I checked the heat shields under the car. This includes the shields over the control arms, catalytic, & the big heat shield over the center of driveshaft.
The guibo & center driveshaft mount looked good.
What I can do without better diagnostic skills:
Swap in the new 3.64lsd.
Swap in the driveshaft from that parts car. The rear cv joint in the original driveshaft could fail causing such a noise? I thought they clicked to death.
Swap in the front strut assemblies & the different wheel bearings from the parts car.
Could a bearing have gone in the 5 speed manual gearbox causing this?