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

[Ken Ames <ameskg@xxxxxxxxx>]

So it should vibrate even when sitting still then?

A couple  of mine have a periodic vibration at idle. Every 5-6 seconds a shudder
comes and goes - V8 and 6 cylinder.

Ken

39Master85w.partscar,67Marlin343,68AMX343,70Machine,73Matador2drht401,
73Hornet4dsd,73-74-75-76GremlinXs,75PacerX,76Hornet2dsd,76-77Matadorcpes,
2-77AMXs304,78AMX304,78Gremlin,78GremlinGT,78Concordsw,79Concordhb,79PacerDL304,
2-79AMXs304/401,2-80AMXs258/401,80SpiritDL304,80Eagle4dsdn,3-81SX4s, 
81SpiritGT,2-81Concord4dsd,82Eaglesw,2-85Eaglesw,2-80J20/360,85J10,2-88Eaglesw, 
89Sentra4dsd,94Sentra2dsd   (45)

AMCA = http://www.amcalberta.ca


Quoting Jesse <j2sax@xxxxxxxxx>:

> So my son's 88 Eagle has a very harsh engine vibration.  We haven't had it
> too 
> long, but I did the MtrCrft Large Cap, plugs, wires and Nutter bypass.  It 
> starts and idles excellently but when you goose the gas, it has a shudder
> that 
> goes through the whole car.  When I am driving down the highway, I can put it
> in 
> nuetral and goose it with similar results.  
> 
> 
> I am hoping it is not the flywheel or dampener.  I have triple checked the 
> firing order, adjusted the timing (after the bypass), locked out the carb
> pins 
> and made sure all the wires were plugged tight.  
> 
> 
> I remembered tonight a V8 swap I did for an old fellow (had a 258 J10 T176, I
> 
> dropped in a 360/727 from a Waggie had had sitting).  For a couple of months
> he 
> would call and say how it was running great and suddenly iy would start
> coughing 
> missing, shaking and the plug gaps would be gone on a plug or two.  I
> determined 
> he had carbon buildup that was dining around the cylinders in occasion and 
> flatting out the plugs.  Some Sea Foam, ATF through the carb (lot's of
> smoke!) 
> and a MotorVac seemed to clear it up.  
> 
> 
> I am going to pull the plugs tomorrow and see what I can find.  
> 
> In the interim, any other ideas?  I am dreading the potetnial of a bad Trq 
> cnvrtr, but am open to suggestions.  
> 
> 
> Thanks and have a great weekend, 
> 
> Jesse
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