C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Engine Shake

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Old Jan 20, 2012 | 07:24 PM
  #1  
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Default Engine Shake

At idle or standing still, my engine & whole car kinda shakes or lobes as if it had a big cam. I've checked & adjusted the timing, a full tune-up has been done including replacing the disributor, ignition coil, plugs, & wires. The engine seems to run fine except for the shaking. Any ideas of what I can check or change.
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Old Jan 20, 2012 | 08:30 PM
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Do a compression check.

How does the coolant look?

Check valve clearances.

Had a strange and similar problem 25 years ago were the lobes on the cam had worn down. Probably not your problem though.
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Old Jan 20, 2012 | 08:46 PM
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Originally Posted by pcolt94
Do a compression check.

How does the coolant look?

Check valve clearances.
The coolant looks ok, it was recently put in after the head gaskets were replaced. How do you check the valve clearances?
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Old Jan 20, 2012 | 09:43 PM
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Are you sure all cylinders are firing? How did the old plugs look when you removed them?
How do the engine mounts look?
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Old Jan 20, 2012 | 09:53 PM
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Originally Posted by 1986coupe
Are you sure all cylinders are firing? How did the old plugs look when you removed them?
How do the engine mounts look?
I checked the new plugs after running them a while and they all looked as though they had been firing, none were wet. I am going to have to check the engine mounts tomorrow. Strange thing though, even if I remove the plug wire from any of the cylinders, I really can't tell if it skips.
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Old Jan 21, 2012 | 12:09 AM
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harmonic balancer?
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Old Jan 21, 2012 | 08:18 AM
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Originally Posted by overdrawn
harmonic balancer?
How can I tell if the harmonic balancer is bad?
I did question if it could have gone bad due to me turning the engine with the mounting bolt when I was setting the valves.
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