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@asmoothmove.biz>
To: <6pack@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
>
> ________________________________________
>
> 6pack@autox.team.net
>
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