Re: [AMC-list] 258 Vibration over 2000 RPM

[Ken Ames <ameskg@xxxxxxxxx>]

Check also for loose/worn belts, pumps, alternator, that hit a harmonic
vibration at about 2000rpm.

Ken


Quoting Jesse <j2sax@xxxxxxxxx>:

> OK, thanks for the input.  I do not know how the trans pump issue came into
> the 
> picture... there is no slippage whatsoever in the trans and I know about
> warming 
> up in neutral.  I have actually instructed my son in this regard.  
> 
> 
> Tonight I yanked all the plugs, regapped and they were all OK... BUMMER!  Was
> 
> hoping that would be the problem.  ONce again checked firing order and, as
> usual 
> the Bird fired right off, idled GREAT.. but still had the violent shake.  
> 
> 
> What happens, even when parked, as you ramp the RPM, at around 2000 RPM it
> goes 
> through a brief period of shaking, smooths out at a little higher RPM, it 
> smooths out, when you let off the gas it does the same violent shake on the
> way 
> back down past 2000 rpm.  Don't know RPM exactly, as don't have a Tach on
> it.  
> 
> 
> So, I pieced together some memories from when I first bought it.  The Starter
> 
> was hanging loose so I replaced it.  Later noticed that a bolt head from the
> Trq 
> cnvrtr was scraping on occasion against the inspection plate.  I pulled the 
> plate, check the bolts, dinged the plate a little and it only occasionally 
> happens when under a load in reverse.  
> 
> 
> Now, I am thinking the flexplate was cracked/broken due to the starter 
> misalignment... BLAHST!  I am going to pull of the inspection plate and have
> a 
> closer look... I am not looking forward to it!  
> 
> 
> I guess if not that, the harmonic blncr is next most likely.  
> 
> Fun never ends!  
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