Citroen C4 - Vibration at startup / engine off. DMF?

Honest John Back Room » Technical matters
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Wed 19 Dec 2012 11:26
Citroen C4 - Vibration at startup / engine off. DMF? - cascas

I have a citroen, that make a vibration at startup, and engine off. Everything else, driving, gearchange, etc is fine.

Could this be a sign of DMF failure. i.e when engine is up to idle speed all is ok, but there is a vibration as the engine is below idle (i.e startup / switch off). Does the DMF rotate all the time when the engine is running, or only when the clutch is engaged?

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Wed 19 Dec 2012 11:31
Citroen C4 - Vibration at startup / engine off. DMF? - skidpan

The DMF is a "dual mass flywheel" which is bolted to the end of the crank like a normal flywheel. It always rotates at engine speed regardless of clutch position.

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Wed 19 Dec 2012 12:22
Citroen C4 - Vibration at startup / engine off. DMF? - Peter.N.

Could be an engine mounting causing the problem. To check the DMF for wear drive at about 50-60 mph and gently lift off the throttle until you are neither driving or on overun, in that 'slack' position you may feel a vibration if the DMF is worn, try slightly accelerating and decelerarating see if you can feel anything, if not chances are that the DMF is OK..

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