RE: IML: 71 carb problem

["Brooks Harkey" <vm.dude@xxxxxxxxxxx>]

I would agree that either the timing chain is loose, or the bushings in the
distributor are worn.  Also, check the counterweights in the distributor for
wear on their pivots.

--Brooks in Dallas

-----Original Message-----
From: mailing-list-owner@xxxxxxxxxxxxxxxx
[mailto:mailing-list-owner@xxxxxxxxxxxxxxxx] On Behalf Of DR CHALLENGER
Sent: Thursday, September 08, 2005 11:56 AM
To: mailing-list@xxxxxxxxxxxxxxxx
Subject: RE: IML: 71 carb problem

sounds like a bad timing chain.


>From: Bruce Stubblefield <audiblefeast@xxxxxxxxx>
>\>Hello list,
>    The mighty 71 four-door (440) refuses to bend to
>repair attempts.  The shop and I have spent a lot of
>time on this, but no soap.  The mechanic I'm using is
>an older guy who is quite familiar with old
>carburetted cars.  Though clearly not a brilliant
>diagnostician, he's solved a number of other problems
>on the car.
>      The symptoms:  From a standing start or from
>coasting at 0 to about 5 mph, flooring the accelerator
>results in "backfire" popping out the top of the carb,
>stalling or almost stalling.  A slower, more gradual
>acceleration does not show this problem.  Also,  car
>surges or bucks intermittently on hard acceleration
>from a stop under a load, as in accelerating up a
>normal freeway onramp leading to an elevated road.
>    In the last month or so, new plugs, spark plug
>wires and electronic distributor (mopar performance)
>have all been fitted.  Scopes both in shop and onboard
>show normal electrical performance.   Timing is
>perhaps 5 or 8 degrees retarded.  Aside from this
>problem, runs fine on 87 octane regular.  I also
>frequently run 91 octane premium.
>     Carb (Carter, not a thermoquad)  was just rebuilt,
>with a new accelerator pump done twice, with no
>improvement.  The shop found a service bulletin in an
>old 69-72 Mitchells  book which described a similar
>problem and gave a solution of re-boring some holes in
>the carb and changing some of the metering needles.
>Carb shop did this per the service bulletin, to no
>effect.  Mufflers and resonators are new.
>      Has anyone solved a problem like this?   Do I
>have to buy a modern carb?
>




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