124- vibration under throttle
 

Hello. My son just bought an '86 300E. What I notice is a vibration starting at about 45 MPH under throttle and getting worse as the speed increases. The moment that the throttle is released the vibration disappears, regardless of speed.

Any ideas where to start looking? Is there a center (carrier) bearing? Flex plate possible? Axle? U joint? Once again, it goes away immediately upon taking my foot off the accelerator. I can feel the vibration throughout the car.

What sort of shop would be best equipped to diagnose? The dealer?


Thanks for all helpful comments!

rr





300E
80k miles
2 owners, not much maintenance
CARFAX shows minor rear end accident

Almost certainly front flex disk. I have the same problem, just haven't got around to fixing it yet.

Do you have any "clunks" as it downshifts at slower speeds?

I agree with ps2cho, if the vibration gets worse as speed increases then it is most likely the front flex disc and not tire/wheel related. Flex discs have a lifespan of 50-70k miles.

The front flex disc connects the engine to the drive shaft.

If you can get under the car and wiggle the driveshaft you can tell if it is bad.

Great! That makes sense! As soon as I can get to the car I'll check that out.

I'm guessing not to hard to replace. Am I wrong?



Thanks!


rr