The Ford Barn

JohnI · 08-15-2023, 10:17 AM

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
[email protected]
802-556-1093

petehoovie · 08-15-2023, 10:32 AM

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

deuce_roadster · 08-16-2023, 08:58 AM

Maybe a valve sticking open or burned.

joe 1950 · 08-16-2023, 09:06 AM

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

47topless · 08-16-2023, 12:05 PM

Quote:

Originally Posted by joe 1950

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 · 08-17-2023, 08:11 AM

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

vilanar · 08-17-2023, 09:33 AM

X 2 lean mixture or leak in exhaust system.

Doublepumper · 08-17-2023, 11:47 AM

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!

08-15-2023, 10:17 AM	#1
JohnI Junior Member Join Date: Jul 2014 Location: Vermont Posts: 21	Backfiring 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 [email protected] 802-556-1093

08-15-2023, 10:32 AM	#2
petehoovie Senior Member Join Date: May 2015 Posts: 8,151	Re: Backfiring Did it do this prior to all of the new stuff? __________________ The only thing nice about being imperfect is the joy it brings to others.... *"Silver rings, your butt! Them's washers!"* "We shot our way out of that town for a dollar's worth of steel holes!" - from 'The Wild Bunch' - 1969 https://www.youtube.com/watch?v=7NReUd2_0u0

08-16-2023, 08:58 AM	#3
deuce_roadster Senior Member Join Date: Oct 2011 Location: Shelton, WA Posts: 3,800	Re: Backfiring Maybe a valve sticking open or burned.

08-16-2023, 09:06 AM	#4
joe 1950 Senior Member Join Date: Mar 2013 Location: Green Bay Wi Posts: 400	Re: Backfiring add some marvel mystery oil put 10 oz to 5 gals it won’t harm anything and drive it

08-17-2023, 08:11 AM	#6
terry Senior Member Join Date: May 2010 Posts: 267	Re: Backfiring Sponsored Links (Register now to hide all advertisements) You didn't mention the carb, but this was happening to me with an old VW. the mixture was too lean. terry

08-17-2023, 09:33 AM	#7
vilanar Senior Member Join Date: Jan 2011 Posts: 162	Re: Backfiring X 2 lean mixture or leak in exhaust system.

08-17-2023, 11:47 AM	#8
Doublepumper Member Join Date: Aug 2017 Location: WA-OR, USA Posts: 68	Re: Backfiring 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! __________________ Ever stop to think and forget to start again?