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Engine? Vibration - Help!
Thread Starter
Joined: Nov 2003
Posts: 6,216
Likes: 236
From: Wichita KS / Rancho San Diego
Engine? Vibration - Help! A friend had his 01 Formula in my buddy's shop today. Car is M6, lid and catback only, 91k. His engine idles roughly, and develops a pronounced vibration @ 1200-1300 rpm in neutral that gradually smooths out as the rpms increase. It's enough to shake the steering wheel and other interior pieces in the affected rpm range.
A tech checked the injectors and scanned for misfires. Injectors were all in spec and there were zero misfires in that rpm range. No misfire codes, either. Plugs and wires are new. No unusual noises or anything.
The car seems to pulll out and drive normally with no loss of power, although the engine seems a little rough.
The tech feels it is an imbalance in the rotating assembly somewhere between the harmonic balancer and the flywheel. He doubts that it's the flywheel and says that if it was, the vibration would continue up the rpm band. LUK clutch is fairly new.
Any tips or help from your experience would be appreciated. He's pretty frustrated.
A tech checked the injectors and scanned for misfires. Injectors were all in spec and there were zero misfires in that rpm range. No misfire codes, either. Plugs and wires are new. No unusual noises or anything.
The car seems to pulll out and drive normally with no loss of power, although the engine seems a little rough.
The tech feels it is an imbalance in the rotating assembly somewhere between the harmonic balancer and the flywheel. He doubts that it's the flywheel and says that if it was, the vibration would continue up the rpm band. LUK clutch is fairly new.
Any tips or help from your experience would be appreciated. He's pretty frustrated.
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What plugs he is using by the way?
I don't have a miss. The car still runs strong, idles smooth and there is no CEL. Maybe I'll start looking at the flywheel/ pressure plate or the accessories. I believe the vibration has been there for quite some time, but the prothane mounts made it more pronounced.
