1956 420

boler76 · Post by **boler76** » Thu Jun 12, 2014 6:34 pm

starts and runs properly when cold, after working(plowing and discing) for approx 1/2 hr, begins to misfire and eventually stops and wont start till cools down for overnight, has plenty of gas running out the carb drain when opened, has spark but very weak, what would you think might be the cause, thanks

Stan Disbrow · Post by **Stan Disbrow** » Thu Jun 12, 2014 8:47 pm

Hi,

Sounds like cracks in the insulator tips of the spark plugs. Modern ethanol laced gas can detonate and cause microcracks to form. Been there, done that.

Stan

whiteclipse16 · Post by **whiteclipse16** » Fri Jun 13, 2014 7:36 am

Could possibly be a bad ignition coil that's breaking down as it warms up.

dr1zsk1 · Post by **dr1zsk1** » Fri Jun 13, 2014 8:22 am

I had a similar situation.

I did the following - not exactly sure which one fixed it.

New Distributor Cap
New Points / Condenser
New Wires
New Rotor
New Coil
New Resistor

Fixed the problem completely - Based on what I was getting in feedback here I suspect the coil was the problem but It all needed to be changed anyway.

Mike

boler76 · Post by **boler76** » Sun Jun 15, 2014 6:30 pm

Thanks for the feedback, will order up some parts and will post back with what I come up with that fixes it

gregjo1948 · Post by **gregjo1948** » Thu Jun 19, 2014 5:20 am

Possable leak in the intake that expands with heat. gregjo1948

vtjoe · Post by **vtjoe** » Thu Jun 19, 2014 1:23 pm

or maybe just TOO lean

boler76 · Post by **boler76** » Sat Jun 28, 2014 7:11 pm

changed coil and condenser and it runs as it should again. thanks for all the input

original possum · Post by **original possum** » Sat Jun 28, 2014 7:43 pm

If you let it run at idle when the misfiring first begins does this extend the life?

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