Wierd Vibration coming back - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 10-17-2005, 01:19 AM   #1
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Default Wierd Vibration coming back

Ok this is very annoying now. Some people in the past suggested my PRJ wires might be the problem but I havn't gotten around to checking the resistance. Anyway when I'm under slight load, about half throttle just to get up to speed in the country, the car feels like it vibrates. I don't think its the engine because RPM'* and nothing looks out of place on autotap. I was thinking its one of 3 things:

1.) Poorly balanced tires -- I have 245/50/16'* which are oversized for my rim and I could never get them balanced right. I'm planning on replaceing them with a good set of Yoko'* in the spring anyway because my balance is way off and the car shakes at 60+mph.
2.) I tore something up in the front axle. Could be possible because the car has a lot more power than its supposed to have. However I have no clue what to look for. My knowledge is strictly engine based.
3.) Maybe those massive 10mm PRJ'* just suck. Todd runs Napa 7mm'* without a problem and all the high horsepower INTENSE cars run Jacobs.

Thoughts?
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Old 10-17-2005, 01:26 AM   #2
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maybe you could try running a diff set of plug wires? the NAPA ones arent terribly expensive, and even if they dont fix the problem you can stick them on the shelf till you do need new wires..
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Old 10-17-2005, 11:19 AM   #3
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Tough to try and guess at with all the other known items. Can you elaborate on the vibration/point of origin etc.

You could have bad suspension parts by putting on the larger unbalanced tires. Could be bad plugs, pcv, bad transmission, bad axle..
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Old 10-17-2005, 02:25 PM   #4
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Have you looked at your harmonic balancer?
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