[Amc-list] Engine vibration

[Don Johnson <donjohnson@xxxxxxxxxxxx>]

Izzy,
I think you can forget the motor mounts as the primary problem.
They may not control a vibrating engine very well but they aren't making the engine vibrate in the first place.
If the wires were recently replaced, that's the first place I would look.
It's not hard to cross up a couple of wires if you're not carefull.
If the wires are okay, run the engine up to where the problem is, not more than 1500 rpm and one at a time, disconnect a wire from a plug. Don't worry, after about 10 jolts it won't bother you any more. 
Seriously, they make plastic pliers to do this so you don't get the jolt.
If the problem is worse, reconnect that plug and go on to the next one. You should be able to spot the cylinders that are causing the problem, IF it is not a balance problem. The problem cylinders are the ones where the engine runs better when the plug is disconnected.
If it's a balance problem, you need to look at something big that rotates, like a torque converter. In my opinion, the balancer could cause a minor vibration at low RPM but nothing big like you're describing.
Good luck.
Don 


I know the fuel system just got revived yesterday (fuel filter).  The  
plugs were properly gapped and wires replaced fairly recently.  The  
engine has been on mounts for quite some time now (5+ yrs), so I dunno.

I. Herman
1973 Javelin
Atlanta, GA
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