Vibration when in gear

[machster]

During deceleration while in gear, my 2001 boxster has a strange vibration at about 3k rpms. Higher or lower it is not evident. It doesn't matter what gear i'm in, it always happens when i slow to around 3k. I am not using the brakes when this occurs. Any ideas?

[rsfeller]

During deceleration while in gear, my 2001 boxster has a strange vibration at about 3k rpms. Higher or lower it is not evident. It doesn't matter what gear i'm in, it always happens when i slow to around 3k. I am not using the brakes when this occurs. Any ideas?

I'll be curious to see some comments. I get the samein the low 2000 range, then gone.

I know I have some light suspension issues (bushing, strut bearings) and posibly a common rear motor mount issue. Maybe the later will be the solution as I seem to notice the vibration about the same time some other rear motor mount issues arrised.

[Chris_in_NH]

During deceleration while in gear, my 2001 boxster has a strange vibration at about 3k rpms. Higher or lower it is not evident. It doesn't matter what gear i'm in, it always happens when i slow to around 3k. I am not using the brakes when this occurs. Any ideas?

is it only during deceleration and not also with acceleration? if it's both, i would check tire pressures and get the wheels balanced.

[deliriousga]

During deceleration while in gear, my 2001 boxster has a strange vibration at about 3k rpms. Higher or lower it is not evident. It doesn't matter what gear i'm in, it always happens when i slow to around 3k. I am not using the brakes when this occurs. Any ideas?

is it only during deceleration and not also with acceleration? if it's both, i would check tire pressures and get the wheels balanced.

Flywheel or pilot bearing. I'm about to change my clutch in the next few weeks and find out which it is. I'm not replacing the flywheel so if the vibration is still there when I'm finishied, it's the flywheel. Either the bearing wears or the flywheel wears off center and causes the problem.

The reason it does not vibrate when accelerating is the engine is putting the pressure on the spin. Since the flywheel/pilot bearing are straight off the crankshaft, the spin is more balanced. On deceleration, the wheels are putting the pressure on the spin so the balance is centered on the tranny end of the drive shaft. If the pilot bearing/flywheel are the problem, then they are at the end with less pressure and can spin out of balance more easily.

The other factor that will tell you it's in the drive train is if it happens in more than one gear at the same rpm. If so, then it's at different speeds. Different speeds mean it's not in the wheels or suspension. Wheel/suspension problems depend on speed of the vehicle so they would happen at speed ranges no matter what the rpm.

Since the problem in mine started I've had the car aligned and balanced just because it was time to do it and there is no difference in the vibration so don't waste your money with balancing/alignment unless it's just time to do it.

Edited November 13, 2006 by deliriousga