Jerry,
Thanks for the reply. Good advice. I have an electric fuel pump. The mechanical
one needs to be rebuilt and is currently off the car. I hate the ticking noise
the electric one makes and have decided at some point to put a switch on it and
rebuild the AC mechanical pump. Of course, the exhaust is so loud I can't hear
the electric pump while driving. For now, I will test the electric one and see
if it is keeping up with demand. I hadn't considered it as a possibility.
Thanks,
Mark A. Evans
1966 TR4A IRS CTC63970 LO
markaevans@mindspring.com
-----Original Message-----
From: Jerry Oliver [mailto:slantws@Home.com]
Sent: Tuesday, August 15, 2000 10:25 AM
To: Evans, Mark
Subject: Re: TR4A Woes - long
Mark
One thing that comes to mind is from similar symptoms I had with a TR4A. The
fuel pump would do at idle and low speeds, but not when driving at speed.
Have you checked to see you are getting fuel when the car becomes stubborn?
Perhaps an obstruction in the tank? Do you have another pump you might
install to check? It's something that should be eliminated as a possible
problem.
Jerry Oliver
----- Original Message -----
From: "Evans, Mark" <Mark.Evans@Anheuser-Busch.com>
To: <triumphs@autox.team.net>
Sent: Tuesday, August 15, 2000 7:05 AM
Subject: TR4A Woes - long
>
> Oh great knowledge base...
>
> I'm having what I suspect are carburetor problems and wanted to bounce the
> symptoms off the list to see if my reasoning is correct and to hopefully
get
> some ideas about what I may be missing. Sorry for the length of this post.
>
> I've static timed, set the point gap, replaced plugs , distributor, rotor,
plug
> wires, low tension lead and added a Lucas Sport coil. Have disassembled
and
> cleaned the carbs (SU HS6) - pretty routine tune-up stuff.
>
> None of this resolved the problem. The car responds well to tuning while
at idle
> before and after the work described above. I drive down the road about 2
miles
> winding it through the gears and having fun. It runs absolutely fantastic
then
> starts missing/sputtering until I have no power and must turn around and
come
> home. Inspection of the spark plugs reveals cylinders 1 and 2 are fuel
fouled
> (dry black) while 3 and 4 are medium tan. I been through five iterations
of this
> - cleaning the plugs after each run and tuning again.
>
> I have adjusted the mixture many times and get the proper short rise in
idle
> speed and settling down on both carbs when lifting the piston. I suspect
the
> front carb float misbehaving but can't seem to verify this. I use the carb
> cleaner trick on the throttle shafts and can't conclusively determine if
there
> is a vacuum leak though by hand the shafts can be wiggled slightly. Both
front
> and rear carbs have a similar slight amount of play in the throttle
shafts.
>
> This all occurred after the car sat for 9 months of shipwrights disease.
There
> was only 1/2 gallon of gas in it and it was not treated/stabilized so I
> suspected I'd gummed the works. This gas should have been worked out by
now and
> it has fresh premium in it. All fuel lines have been cleaned or replaced
and a
> new fuel filter installed. When I cleaned the carbs they were quite
dirty -
> especially the front float bowl. It ran fine 9 months ago. It has Grose
jets for
> float valves.
>
> Any ideas?
>
> Thanks,
> Mark A. Evans
> 1966 TR4A IRS CTC63970 LO
> markaevans@mindspring.com
>
>
>
>
>
>
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