Vibration on acceleration
04-25-2005, 01:16 PM
#1
Three Wheelin'
Thread Starter
Vibration on acceleration
Rennlisters.
Some advice sought. For some little while now - mostly noticed since I had my 24,000 service done at JZ Machtech, I've noticed the occasional strong vibration through the gear lever when accelerating - maybe around 4,500 to 5000 revs.
It's not always there and it comes and goes but I'm at a bit of a loss to identify what's causing it.
Speaking to a few of the guys at the SE meet yesterday there was a lot of opinion that it may be failing engine mounts. Speaking to Chris at JZ today he suggested that the common cause is the DMF - but I blew that one out since my car is a '89 with a single mass flywheel. Engine mounts was Chris's second guess.
Any other offers???? The 24K service also included all belts being changed, valve clearances etc. Belt tension "look" OK and I can't think of anything obvious which would cause the problem. I did recently change the gear **** itself but the new one is held on with a grub screw (rather than just a push fit).
Regards
Dave
Some advice sought. For some little while now - mostly noticed since I had my 24,000 service done at JZ Machtech, I've noticed the occasional strong vibration through the gear lever when accelerating - maybe around 4,500 to 5000 revs.
It's not always there and it comes and goes but I'm at a bit of a loss to identify what's causing it.
Speaking to a few of the guys at the SE meet yesterday there was a lot of opinion that it may be failing engine mounts. Speaking to Chris at JZ today he suggested that the common cause is the DMF - but I blew that one out since my car is a '89 with a single mass flywheel. Engine mounts was Chris's second guess.
Any other offers???? The 24K service also included all belts being changed, valve clearances etc. Belt tension "look" OK and I can't think of anything obvious which would cause the problem. I did recently change the gear **** itself but the new one is held on with a grub screw (rather than just a push fit).
Regards
Dave
04-26-2005, 12:45 AM
#2
Burning Brakes
Join Date: May 2003
Location: N. OC, CA
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Originally Posted by Computamedic
...there was a lot of opinion that it may be failing engine mounts.
A test to see if your engine mounts has failed is to jack up your car from the case and if the engine rises more than 1 inches before the chassis does then there's a good chance the mounts need replacing. I replaced mine last year at 52,000 miles.
04-26-2005, 12:49 AM
#3
Jarhead
Rennlist Member
Rennlist Member
I've had similar issues with annoying shakes and shudders at times. Checked the engine mounts, they're fine. I'm beginning to think it might just be a function of the lighter weight flywheel being a bit touchy. Perhaps that's why they switched to the dual mass. However, if yours doesn't have anything to do with shifting, I think you can probably rule that out too. If it's straight acceleration that you're talking about, with the vibes coming on around 4500, then hmmm....
Brian
Brian
