The Ford Barn

tiger.1000 · 05-27-2019, 09:11 AM

Last year the car was running sweet as a nut. First time start this year. On a light throttle car runs well but as soon as throttle is depressed there is a backfire through the exhaust.

Idles sweetly; points,plugs and condenser appear OK.

Adjusting GAV valve has no effect on the problem. Fresh fuel in the tank.

Any clues ?

DavidG · 05-27-2019, 09:44 AM

Stuck centrifugal advance weights?

tiger.1000 · 05-27-2019, 12:15 PM

Thanks David but no. Sacrificed lunch and took the bull by the horns. Stripped the carburettor..... jets properly gummed up. Now runs like a model 18 or better !

petehoovie · 05-27-2019, 12:38 PM

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I had a similar problem (rough running) with my '37 and '53 after sitting dormant for a period of time. They ran fine prior to winter storage. I chanced that the fuel system could be the culprit. I poured a 12oz. bottle of Chevron Techron into the tanks of these two cars and the engines smoothed out in very a short period of time....

05-27-2019, 09:11 AM	#1
tiger.1000 Senior Member Join Date: Apr 2011 Location: Hertford (UK) Posts: 905	Model B backfire Last year the car was running sweet as a nut. First time start this year. On a light throttle car runs well but as soon as throttle is depressed there is a backfire through the exhaust. Idles sweetly; points,plugs and condenser appear OK. Adjusting GAV valve has no effect on the problem. Fresh fuel in the tank. Any clues ?

05-27-2019, 09:44 AM	#2
DavidG Senior Member Join Date: May 2010 Location: southeastern Michigan Posts: 10,101	Re: Model B backfire Stuck centrifugal advance weights?

05-27-2019, 12:15 PM	#3
tiger.1000 Senior Member Join Date: Apr 2011 Location: Hertford (UK) Posts: 905	Re: Model B backfire Thanks David but no. Sacrificed lunch and took the bull by the horns. Stripped the carburettor..... jets properly gummed up. Now runs like a model 18 or better !

05-27-2019, 12:38 PM	#4
petehoovie Senior Member Join Date: May 2015 Posts: 8,111	Re: Model B backfire Sponsored Links (Register now to hide all advertisements) I had a similar problem (rough running) with my '37 and '53 after sitting dormant for a period of time. They ran fine prior to winter storage. I chanced that the fuel system could be the culprit. I poured a 12oz. bottle of Chevron Techron into the tanks of these two cars and the engines smoothed out in very a short period of time.... __________________ 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