[6pack] Annoying Bucking/Stumble

[Bill Wellbaum]

Interesting you would ask this question.  A few years backI had a bucking 
problem at low rpm's under light load. I did all you did below and 
discovered that by installing new air filters the problem vanished.  Easy 
solution.  Fast forward a few years and the bucking and jerking increased 
until the car was literally undriveable.  In the past 4 weeks I have 
replaced: ignition wire, plugs, rotor, condenser, points, dizzy cap, dizzy 
ground wire, fuel pump, fuel filter--all to no avail.  I then dismanteled 
the Zenith carbs and checked the floats for proper settings, and checked 
every oriface for blockage.  Back on went the carbs to no avail.  I took the 
main ground strap off and cleaned it up--no change.   I then increased the 
points gap to .020" and the problem partially cleared up.  Well, as it turns 
out the bushings in the distributor were shot.  I am waiting for the return 
of my fettled dizzy and am hoping that the problem will have been solved.  I 
will advise all later this week of my findings.

Bill Wellbaum
Hopeful in Las Vegas.
----- Original Message ----- 
From: <brian at asmoothmove.biz>
To: <6pack at autox.team.net>
Sent: Monday, April 09, 2012 6:44 AM
Subject: [6pack] Annoying Bucking/Stumble


> Hi guys,
>
> Maybe some of you have a remedy for a problem that annoys me.
>
> When my engine is at operating temperature, the car will buck several 
> times
> when applying part throttle, under load, in 3rd, 4th or overdrive. It does
> not do this when cold, nor if I down-shift. The carbs were re-built by
> Paltech last year - air valves don't seem to be opening prematurely and I
> have the proper oil in the dashpots. The plugs (clean), cap and condenser
> are newer, wires OK, points clean, new rotor installed. Timing is dead on 
> at
> 12BTDC when the retard is plugged off. Stock cam/exhaust and 10.1
> compression - recent cylinder head rounding/polishing to eliminate pinging
> (which it did).
>
> Any ideas out there would be greatly appreciated.
>
> Brian J. Alwin
> 1972 TR-6
> CC79085
>
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