Re: [Amc-list] Engine Vibration

["Armand Eshleman" <aje1@xxxxxxxxxxxxxxx>]

Izzy,

I'm just guessing here but for some reason I think it might be a misfire. If
the car still has the
original distributor in it, the bearings could be loose causing a misfire at
certain RPM which
would create vibration.
Or the cap may have a carbon track in it that shorts out one plug. Check
that all eight are firing properly. This will let it idle OK, but a bit
luggy, but will act up when throttle
settings are increased. If it strains to increase RPM rather than rev freely
it's a misfire.
Collapsed lifter? Causing misfire?
If the car is inside open the hood.  shut off all the garage lights, close
the garage doors, blind the windows, start it
up and watch under the hood for stray sparks around the plug wires, don't
let it run long (CO poison) listen for cracking
sound of spark jumping around crazy under hood. Open garage doors and
windows to ventilate garage.
I hope the flex plate hasn't dropped a balance weight. Could remove the
inspection cover and check.
Hope this helps along with Joe's ideas.
I can't think of anything else right now......
Armand


----- Original Message ----- 
From: "I. Herman" <73jav@xxxxxxxxxxxxxxx>
To: "AMC/Rambler owners, drivers and fans." <amc-list@xxxxxxxxxxxx>
Sent: Friday, April 13, 2007 12:07 PM
Subject: Re: [Amc-list] Engine Vibration


> Joe - thanks.  I'll forward this on as i'm not qualified either.
>
> 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
>
>
> On Apr 13, 2007, at 1:03 PM, JOE FULTON wrote:
>
> > Izzy,
> >
> > Engine vibrations can come from a number of causes.
> > It is difficult to diagnose the cause based on second
> > hand information....difficult for you, and difficult
> > for anyone on the list to do it by remote control.
> >
> > If the engine is newly transplanted, of course, have
> > the "crew" check the motor mounts for proper
> > installation and condition.
> >
> > A vibration upon acceleration can often come from a
> > misfire, so make sure the spark plugs are clean and
> > properly gapped and check the condition and
> > installation of the entire ignition system, especially
> > the plug wires and distributor gap.  Check the point
> > gap if the distributor still has points.  Check the
> > timing and how the centrifugal advance works.
> >
> > Check for vacuum leaks, since the engine could be
> > running lean on acceleration (although that will
> > ususally cause a backfire through the carb, which you
> > did not mention).
> >
> > The vibration also be fuel related.  Inadequate flow
> > from the accelerator pump on the carb could be cause
> > my an inadequate pump stroke or defective pump.
> >
> > If they really want your help, and you feel qualified,
> > you should go to the car or have it brought to you.
> >
> > My $0.02.
> >
> > Joe Fulton
> >
> >
> > --- "I. Herman" <73jav@xxxxxxxxxxxxxxx> wrote:
> >
> >> All -
> >> First off...hello again to all of you...been gone
> >> for a
> >> while....anyhoo..
> >>
> >> Scenario:
> >>
> >> 73 Javelin, Automatic Transmission
> >> Engine = 76 360 from grand wagoneer, bored .060 over
> >> Fuel - Edelbrock Performer Intake/Carb
> >>
> >> The car is at my ex-wife's house and her crew has
> >> been working on
> >> it.  The description I'm getting is:
> >>
> >> "If i idol and gently press gas, no problem, but as
> >> soon as I
> >> accelerate, it seems the engine vibrates a LOT"
> >>
> >> What could be causing this?  Loose motor mounts?
> >> Harmonic balancer
> >> issue?  Suggestions?  Thoughts?
> >>
> >> Thx in advance and it's good to be back..especially
> >> since my car is
> >> at least running finally (w00t).
> >>
> >> I. Herman
> >> 1973 Javelin
> >> Atlanta, GA
> >> _______________________________________________
> >> Amc-list mailing list
> >> Amc-list@xxxxxxxxxxxx
> >> http://www.amc-list.com/mailman/listinfo/amc-list
> >>
> >
> > _______________________________________________
> > Amc-list mailing list
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> >
>
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