Who Can Diagnose THIS Total Mystery? Win A Prize?

[Mitch//pa]

i just had one doing that, and the cause was the nurex/modern upper distributor plate that someone put in. they have a poor connection design that takes the place of the wire. we replaced it back with an original style plate.
We used a conventional spark tester to determine it was electrical and not fuel. When the problem occurred the spark got weak and erratic.
whats the prize?

[Tom Wesenberg]

Originally Posted by Mitch//pa

i just had one doing that, and the cause was the nurex/modern upper distributor plate that someone put in. they have a poor connection design that takes the place of the wire. we replaced it back with an original style plate.
whats the prize?

A modern Nu Rex upper distributor plate!

[ehb2talk]

I had a problem like this and it was the coil. When it got hot some of the copper wires inside seperated and it acted like it was dead. After it cooled down it would start up and run untill it got hot. I replaced it and solved the problem. I changed carb, dist., and any thig else I could think off. I was on a trip with the club and was glad to git it running again. eric

[JBohannon]

If indeed pulling the choke out helps some for a while it sure seems to me you may have a vapor lock. I still say check gasline getting too much heat from exhaust.

[Tom Wesenberg]

Originally Posted by JBohannon

If indeed pulling the choke out helps some for a while it sure seems to me you may have a vapor lock. I still say check gasline getting too much heat from exhaust.

This could be the problem, but my 28 had that problem when using 10% ethanol crap gas and setting at a red light. Then it would cough and sputter for a few blocks until the fuel cooled a bit. Pulling the choke about 2/3rds. did help a bit as I pulled away from the light. I never remember having a problem as long as the car was moving over 10 MPH.

[Gary WA]

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Originally Posted by JBohannon

If indeed pulling the choke out helps some for a while it sure seems to me you may have a vapor lock. I still say check gasline getting too much heat from exhaust.

Using the choke when it starts dying has NO effect on performance.

[Double Trouble]

Having experienced the same symptoms I would have bet it was a clogged gas cap vent, that's what it turned out to be in my case, BUT, I know a guy who had a similar problem and it turned out to be a mouse nest in his muffler, it would run until the muffler developed enough back pressure to kill the engine and after it sat a while it would start right up again and repeat the process , go figure.