Sounds like your front carb is flooding. Take the air cleaner (s) off and
feel below the carb to see if it's wet and/or if it's wet where the air
enters the carb if so then it's definitely flooding. Usually it's the
needle valve for the float chamber that gets clogged...and it's usually the
front carb that gets the gunk first. I don't know what carbs you have but
with Strombergs you can remove the bottom of the float chamber and clean it
out. Gently work the needle valve up and down to clear it out and if you
have a bottle of air (e.g. for cleaning computers) you can blow some air on
it. Be careful of the float and the gasket when you put it all back
together. Clamp the gas line (the rubber portion) to keep gas from running
all over the engine bay. You may want to unclamp it so the gas helps to
clear the needle valve when you're working on it.
Oh and the reason it runs good when cold is that its using that extra gas as
if it's being choked...I'd bet you don't have to use the choke much when you
first start it. Once the engine is warm though it becomes a too rich
mixture situation (and hence the black plugs) and won't run for beans.
Bud Rolofson
71TR6 CC57365 (Good 6)
66TR4A CTC57806 (The Wreck-Almost Parts)
66TR4A CTC57529 (The Project)
----- Original Message -----
From: "Patrick Cantwell" <cantwell@gte.net>
To: <triumphs@autox.team.net>
Sent: Saturday, November 30, 2002 1:03 PM
Subject: TR3A Runs great til it gets warmed up!
> I just bought a 1958 TR3A and it ran fair until it got warmed up and then
had
> incredible power loss--in fact we couldn't get it to run for more that
30-60
> seconds and that was when really feathering the gas. I put in a new
ignition
> coil & fuel pump and changed the plugs. Now it runs even better, great in
> fact, until it reaches just under 185 degrees on the gauge and it has the
same
> power loss--ie. step on the gas in 2nd or 3rd & it's just like there's no
fuel
> or spark--at lower RPM's ( & in 1st) it runs rough but it runs. I checked
the
> compression when it was at the temperature of the problem & I'm getting
150 in
> each cylinder. I get 50 for oil pressure when it first starts & then it
falls
> off to a 40 at 2,000 rpm when it's warmed up. The plugs for the back two
> cylinders are great but the front two are carboned up---I assume because I
was
> still pushing the gas pedal and it wasn't firing cleanly. Again, when I
let
> it cool, it starts & runs great. Any ideas?
>
> Patrick in Dallas
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