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Discussion Starter #1
I am getting some vibration that I am almost postitive is coming from the engine (it vibrates while sitting still). I believe it is coming from either a bad motor mount or from a worn harmonic balancer. Is there a way to pinpoint the problem. I had the car in the garage last night with the hood up and when revving the motor, the drivers side of the motor would lift maybe one inch. Is this normal for a healthy motor mount?
 

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The motor does lift some when reving the engine. The best way to tell if a mount is bad to put the car in gear, press the brake down and tap the gas. If its bad it will show then for sure. Pop the hood so you can see. Hope that helps some.
 

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yes, he is right, a bad motor mount will cause the motor to twist one way when revved up. As for the one inch, no, that really is'nt normal. It may be slightly worn now but it's only getting worse every day
 

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I agree, 1 inch of movement is too much. You must have old non-interlocking mounts because if an interlocking mount fails, the engine still wouldn't move that much.
 

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I had a bad torgue convertor once did the same thing

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69 convertible
LT1 4L60E
 

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Discussion Starter #6
Thanks for the replies. I will try revving it in gear to see what happens. The car is a 4-speed so luckily, I can rule out the torque converter. These vibration things make you crazy!
 

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well, look at it this way, motor mounts and harmonic balancers are really not that expensive to replace, so if you change the motor mounts and it still vibrates, put a new balancer in. should'nt go nowhere then
 
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