Jeff Slaton tells a tale of woe:
> It will start up and run for about 10 minutes or so and when it gets up to
> temperature it cuts out and quits.
Bummer.
> I have done a number of different things that others have suggested
> but none of them have produced any different results.
A bad coil or ballast resistor whose performance is temperature-dependent
might be a place to look, but if the trouble is more or less the same as
before you did all that stuff, then they probably aren't "it".
> #1 Improper carb rebuild..
> #2 Manifold leak noticed only after the car gets warm.
Probably not it either.
> #3 Incorrectly working egr valve.
You can disable the egr valve as long as it isn't required by local laws.
But this probably isn't it either.
The time-dependence is an interesting clue. Assuming you've check for good
spark when this condition happens so you can rule out ignition problems,
here are some suggestions:
1. You may have a leaking head gasket that blows water into the cylinders
only after the cooling system has developed pressure. It is unlikely that
it is affecting them all together though. In any case, if this is so bad as
to be the problem you would probably see steam (whitish "smoke") coming out
the tailpipe. So this isn't very likely.
2. The carbs are probably getting starved for fuel. This could be caused
by a fuel filter that is clogged, or that gets clogged as you drive and then
clears up "mysteriously" when debris falls away from the filter element.
You can check this easily of course by inspecting the filter.
3. The carbs are getting starved for fuel because the fuel pump can't keep
up with the demand. Perhaps a weak pump?
4. The carbs are getting starved for fuel because your fuel tank is
developing a vacuum as the fuel pump draws fuel out. Perhaps your gas cap's
vent is plugged. Or perhaps you mis-rigged a vacuum line that is supposed
scavange vapors from the tank, so you are "vacuumizing" your tank too much.
If you loosen your gas cap does the problem still happen?
Jim Muller
jimmuller@pop.rcn.com
'80 Spitfire (Percy)
'70 GT6+ (Nigel)
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