Vibration at 3500 rpm
10-01-2003, 02:11 PM
#1
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Join Date: May 2000
Location: Mesquite , Texas
Posts: 15
Vibration at 3500 rpm
91 Z-28 5.7 .....vibration at 3500 in my driveway in park. Checked the balancer appears to be ok...any ideals ? Can the torque convertor cause this ? Also vibration comes in @ about eighty miles per hour on the highway at about 2700 rpms..driveshaft ahs been balanced as has the wheels..Still searching ?
10-01-2003, 03:49 PM
#2
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Join Date: Sep 1998
Location: US 1 Mile Marker 52 in the Florida Keys
Posts: 8,321
bad motor mounts and that is just the engine speed that creates the right frequency to make it noticable?
since it's in park it can't be anything behind the tranny right.
flex plate broken?
since it's in park it can't be anything behind the tranny right.
flex plate broken?
10-01-2003, 09:29 PM
#4
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Join Date: Mar 2001
Posts: 3,249
This is simple to check. I would raise the car, remove the flexplate shield and shine a flashlight. Rotate the engine and you can see the entire flexplate. Turn it via the crankshaft bolt. If that is fine, have you checked the harmonic balancer? You would need to set it to TDC for #1 and see if it is at 0. Your balancer could have come off the rubber and rotated out of place.
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