wierd bumpiness

[bmw325csi]

Well after one and a half hours of searching various forums, I could'nt find shit on my problem.

Well when I let off the throttle in 2nd or 3rd gear the car gets bouncy after it drops under 3000rpm. Feels like a stalling car. I dont even know where to start looking as none of my e30's have ever done this. Im grateful for any help you guys can give me. Thanks for reading.


Allright guys im starting to think its a clutch issue as it goes away when i press the clutch.

[kenika65]

It doen't mean it is the clutch it means it is in your drive line. So check your drive shaft guiebo, center support, and diff fluid level. worth a look if you dont know their condition.

If it was the clutch it wouldn't grab when accelerating not decelerating.

[bmw325csi]

Thanks for the input. I recently changed my csb and my guibo. But I think i should inspect them nonetheless. Is there any way i could of installed the flexdisc wrong?

[xLibelle]

gearlash in your tranny or diff.
you'll have to get under the car and disconnect the drive shaft at one place and test the tranny output and diff input.

[bmw325csi]

^ now when you say test, do you mean rotate and make sure it spins freely or........?

[Aptyp]

wonder if you put the drive shaft together wrong. They are balanced together at the factory. and +1 on other suggestions so far.

[bmw325csi]

^ im fairly sure I put it on right. I marked it before i took the halves apart.

[dark89e30]

I vote for driveshaft. sounds like a bad u joint to me. But I could be wrong of course...

[xLibelle]

broken drivers side engine mount

[bmw325csi]

^ yeah? but would that go away every time i engage the clutch?

[E30_fiend]

throw out bearing.

[xLibelle]

if you are at 10-25 mph and in 1st-3rd gear and not on throttle and the car goes into a lurching motion, then yes, likely an engine mount.

the engine and cars momentum are fighting eachother. if you get on the clutch, the cars momentum is not there to torque the engine off the mount. While applying throttle, the engine is leaning on the broken mount and pulling on the good one, while carrying the car's mass.

just a suggestion.

[bmw325csi]

^thanks! going under car........Now.