L67toLS1

iTrader: (4)

Been having a strange vibration, the car sounds fine at idle but makes a deep vibration, almost like a knock under load. It still makes the same vibration when not in gear and revving it. The vibration gets louder/faster with rpms. Oil pressure is fine, idle is good, no SES lights. I've had one guy say main bearing/rod bearing issues and that it's not bad enough yet to really be able to tell....WTF? And another friend has said "don't worry about it." Unfortunately I don't have the luxury not to worry about it. Anyone have any ideas?

DaddySS

What mods have been done recently? Is there a miss? How long ago since the clutch? Does it change with clutch depressed?

97Rob

I had the same symptoms, it was a spun rod bearing. Check the oil plug for shavings.

L67toLS1

iTrader: (4)

I can still hear it with the clutch in, clutch is 400 miles old, but it made the sound before and after. All mods less than 2 weeks old in list. I'm afraid it is a rod bearing, I'm going to cut the oil filter tomorrow and unplug a coil at a time to get a closer diagnosis.

James

TXsilverado

iTrader: (18)

Haven't cut oil filter yet, but just changed oil, it looks good and no metal shavings, minimal material on the oil plug, again no shavings. Friend's saying it might be a coil/wire.

James

TXsilverado

iTrader: (18)

by the way, I'm posting on a friend's comp, this and last post is...L67toLS1

DaddySS

Thta sounds about right because if you are experiencing a shake, that is not characteristic of a rod.

L67toLS1

iTrader: (4)

Vibration is still there under load, it got better with plugs and wires, but still noticeable...is it possible that a coil is not dead, but "failing?" As in, not giving enough spark? I'm still hoping its not an internal issue....drives okay, oil pressure okay, just has a vibration and slight thumping noise.

James