1979-1993 & 94 Conv [Subscribe to Daily Digest] |
![]() | [Main C900 Bulletin Board | BBFAQ |
Prev by Date | Next by Date | Post Followup ]
Member Login / Signup - Members see fewer ads. - Latest Member Gallery Photos
Re: weird vibrations Posted by JimBlake [Email] ![]() ![]() ![]() In Reply to: Re: wierd vibrations, Howell, Mon, 4 Nov 2002 16:39:57 Members do not see ads below this line. - Help Keep This Site Online - Signup |
It sure sounded like the alternator wobbling because its mounting bushings were shot. Not the same as a bad belt. Some large motion like that would have a low natural frequency, so it would smooth out at higher rpms.
The flywheel can become unbalanced like anything else, it just has to be missing a bolt or something. But I imagine it would not go away at higher rpms.
A bad front engine mount would act up when you are accelerating, putting load on the mount. Just revving the engine while sitting still, if the engine were smooth, wouldn't do it. But it can't hurt to inspect all 3 engine mounts.
How about one cylinder losing power under certain conditions? Have somebody hold the rpms where the vibration is strongest. Then you unplug one spark plug at a time, while your friend does not adjust the gas pedal to compensate. Look for one which has a much smaller influence than the others. Then maybe a fouled spark plug, bad plug wire, clogged injector, etc...
posted by 131.184.14...
No Site Registration is Required to Post - Site Membership is optional (Member Features List), but helps to keep the site online
for all Saabers. If the site helps you, please consider helping the site by becoming a member.
![]() |
![]() |
![]() |
![]() |
![]() |