Backfiring

[JohnI]

I have a 1934 Ford V8 with 100,000 original miles. It backfires intermittently. New wires, plugs, condenser with recently rebuilt coil. Any suggestions?
John Irving
Jirvingvt@gmail.com
802-556-1093

 

[petehoovie]

Did it do this prior to all of the new stuff?

 

[deuce_roadster]

Maybe a valve sticking open or burned.

 

[joe 1950]

add some marvel mystery oil put 10 oz to 5 gals it won’t harm anything and drive it

 

[47topless]

add some marvel mystery oil put 10 oz to 5 gals it won’t harm anything and drive it

Great advice. You can also slowly pour a little down the carb, while engine is running. Let'r smoke!

 

[terry]

You didn't mention the carb, but this was happening to me with an old VW. the mixture was too lean. terry

 

[vilanar]

X 2 lean mixture or leak in exhaust system.

 

[Doublepumper]

Backfiring can also be associated with an intermittent loss of voltage in the ignition system somewhere. May want to check wire connections and a possible wire rub through to the body. A while back I chased a backfire and found a coil on the ballast resistor had broken and was barely touching. Just last week I got the pleasure of troubleshooting another backfire and found the ignition switch contacts were toasted and causing the problem. Good luck!