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Persistent Rumble/Vibration At Idle 700

Hi,
My daughter's '88 740 b230f has a rumble in the transmission housing area on kicking over and then vibrates, if in gear, while at idle. Placed in neutral the vibration stops.

This started to happen after new FCP Groton hydraulic engine mounts were installed. I'm not sure the mounts are the cause as it did not start straight after replacement.

I have since done the following -replaced trans mount and harmonic balancer which were desperately needing replacement,
-replaced leaking cat converter and missing engine pipe bracket.

Any suggestions appreciated. Thankyou in advance.

John H from Downunder






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