SilverCoupe
Registered User
I just got done changing out my Harmonic Balancer, crank pulley, and the associated bolts today on my 89 SC 5-speed with the help of some friends. The reason being was because the car has had a terrible vibration since I bought it about 2 weeks ago. The cars acts exactly the same; I might as well have left the original HB on there seeing as it had no play or visible wobble.
The vibration is relative to RPM, not speed. It exists at idle with the tranmission disengaged, during regular driving, and is really felt when the car is taken above 3000rpm. At idle, the vibration is slower and shakes the whole car. If the hood is popped, you can watch the engine shudder in the engine bay. As you drive the car, the vibration becomes less noticeable between 1000 and 2500rpm, but is still felt vaguely in the shifter. As you take the car above 2500, the vibration gets quicker and more intense, to the point of shaking the chassis and shifter at anywhere over 4500 rpm.
Now, I would think the fact the car runs properly with no misses, etc. rules out any injector/spark issues. This would leave me with no other culprit than possibly engine/tranny mounts, right? Does it sound like that may be the problem here? I would point a finger at something in the driveline, but that wouldn't explain the fact the vibration still exists when the clutch is pressed.
Any help or insight would be much appreciated.
The vibration is relative to RPM, not speed. It exists at idle with the tranmission disengaged, during regular driving, and is really felt when the car is taken above 3000rpm. At idle, the vibration is slower and shakes the whole car. If the hood is popped, you can watch the engine shudder in the engine bay. As you drive the car, the vibration becomes less noticeable between 1000 and 2500rpm, but is still felt vaguely in the shifter. As you take the car above 2500, the vibration gets quicker and more intense, to the point of shaking the chassis and shifter at anywhere over 4500 rpm.
Now, I would think the fact the car runs properly with no misses, etc. rules out any injector/spark issues. This would leave me with no other culprit than possibly engine/tranny mounts, right? Does it sound like that may be the problem here? I would point a finger at something in the driveline, but that wouldn't explain the fact the vibration still exists when the clutch is pressed.
Any help or insight would be much appreciated.