The Ford Barn

Kurto428cj · 06-15-2015, 11:12 PM

Any suggestions on backfiring on deceleration? I cleaned carb, fuel tank and sediment bowl

Brentwood Bob · 06-15-2015, 11:32 PM

check for air leaks:
loose intake/exhaust at block,
bad gasket at intake/exhaust,
accelerator shaft loose(air leak),
carb seal at intake leak.
Bob

Synchro909 · 06-15-2015, 11:48 PM

Backfiring is a term very often misused. Do you mean the car is igniting fuel in the exhaust or is it firing out through the carburettor? They are completely different but many people call both of them a "backfire".

RUNNERBUN · 06-16-2015, 04:00 AM

Your problem is consistent with you engine running to lean. As Brentwood Bob mentions you need to look for any air leaks in your fuel system. Air leaks will result in your air/fuel mixture becoming to lean (to much air and to little gas) resulting in backfires. If you can't find any air leaks try running with your gas adjusting valve opened by another quarter turn and see if that solves your problem. If opening the GAV solves your problem I suggest you install a set of flow tested jets in your carb.

Bobant · 06-16-2015, 07:39 AM

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Have you checked the compression on each cylinder? My same problem was the fact that one of the exhaust valves was stuck open. If I was experienced I would have known by the lack of power, but I was not. Learn by our mistakes.

06-15-2015, 11:12 PM	#1
Kurto428cj Junior Member Join Date: Jun 2015 Posts: 1	backfiring Any suggestions on backfiring on deceleration? I cleaned carb, fuel tank and sediment bowl

06-15-2015, 11:32 PM	#2
Brentwood Bob Senior Member Join Date: May 2010 Location: brentwood, ca Posts: 4,245	Re: backfiring check for air leaks: loose intake/exhaust at block, bad gasket at intake/exhaust, accelerator shaft loose(air leak), carb seal at intake leak. Bob

06-15-2015, 11:48 PM	#3
Synchro909 Senior Member Join Date: Jun 2014 Location: Melbourne, Australia Posts: 7,496	Re: backfiring Backfiring is a term very often misused. Do you mean the car is igniting fuel in the exhaust or is it firing out through the carburettor? They are completely different but many people call both of them a "backfire". __________________ I'm part of the only ever generation with an analogue childhood and a digital adulthood.

06-16-2015, 04:00 AM	#4
RUNNERBUN Senior Member Join Date: Nov 2011 Location: Queensland Australia Posts: 640	Re: backfiring Your problem is consistent with you engine running to lean. As Brentwood Bob mentions you need to look for any air leaks in your fuel system. Air leaks will result in your air/fuel mixture becoming to lean (to much air and to little gas) resulting in backfires. If you can't find any air leaks try running with your gas adjusting valve opened by another quarter turn and see if that solves your problem. If opening the GAV solves your problem I suggest you install a set of flow tested jets in your carb. __________________ Adjust your points with gentle blows of a 2 pound hammer

06-16-2015, 07:39 AM	#5
Bobant Member Join Date: Mar 2015 Location: Bedford, Va Posts: 50	Re: backfiring Sponsored Links (Register now to hide all advertisements) Have you checked the compression on each cylinder? My same problem was the fact that one of the exhaust valves was stuck open. If I was experienced I would have known by the lack of power, but I was not. Learn by our mistakes.