M20 Engine Vibrations at 1250 RPM

[redrobinwgn]

Hello everybody,

I have a M20B27 that developed some weird engine vibrations yesterday. It happens when in gear or in neutral. At idle the car feels normal. At 1250 RPM when inside the cabin you can feel the whole vehicle shaking with the engine. The vibrations go away at RPMS above this though.
Any thoughts? I removed the accessory belts and that did not help.

[bmwman91]

Dead engine mount? Other than the vibration, are there any unusual noises coming from the engine to indicate a mechanical problem?

[tomstin]

Pull the spark plugs and see what they tell you. A bad cylinder tends to show up a lower RPMs.

[ADEN]

I had this issue for a while changed engine mounts with no success then after alot or searching it was the flywheel bolts mine the stupid mech torque only 4 bolts out of 8.