Date registered: Sep 2008
Location: Eastern USA
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Harsh engine vibration, E320 V6 '2004
'2004, E320 V6 gasoline, 70k miles, airmatic, RWD, W211 065 model.
My car has had harsh engine vibration since 65k miles. I replaced engine mounts and the car idles and runs much smoother. But I still get rough vibration from 1200rpm~5000rpm, especially more at +-1200rpm, +-2100rpm, +-4000rpm. It vibrates in drive, neutral, even in park, cold, and hot(a little less). It's not a resonance but a whole engine body vibration.
It feels like V5 engine but no error codes found.
I also replaced the idler pulley, water pump. Tensioner, power steering pump, alternator, a/c compressor seems ok. I cleaned the MAF sensor. I'm going to change spark plug & valve cover gasket next week.
In my searches, it might be;
- spark plugs?
- ignition coils?
- PCV valve?
- harmonic balancer?
- broken crankshaft main bearing?
- transmission torque converter?
Any information with previous experience of similar symptoms will be much appreciated!