The Ford Barn

taffrail · 12-13-2015, 08:34 PM

I have a small pop between shifts after it warms up, what should I check first, fuel or ignition.

jm29henry · 12-13-2015, 08:38 PM

Both probably running rich,but if timing is off or week spark both could cause your problem

Mitch//pa · 12-13-2015, 08:43 PM

Assuming your timing and points are both set to specs, usually running lean or retarded timing causes the little pops ,,,,,open the GAV a little more ... You can also try advancing the timing a little more...
An exhaust leak can also make pops on decel

steve s · 12-14-2015, 12:05 PM

I will break the tie and vote for running too lean.

larrys40 · 12-14-2015, 01:18 PM

Quote:

Originally Posted by Mitch//pa

Assuming your timing and points are both set to specs, usually running lean or retarded timing causes the little pops ,,,,,open the GAV a little more ... You can also try advancing the timing a little more...
An exhaust leak can also make pops on decel

I agree with Mitch.. Look for all he prescribed and cracks around the exhaust and/or intake manifold as well.
One of them will solve your issue.
Larry

taffrail · 12-14-2015, 09:41 PM

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The GAV and the spark didn't cure it, been getting louder , thought my hearing was coming back, I better check for leaks.
Thanks for your help guys, I'll let you know.

larrys40 · 12-14-2015, 10:08 PM

I worked on a roadster recently that was doing the same thing and I had just serviced it and in looking at it the exhaust manifold was cracked underneath the intake . I believe the owner ran it and forgot to advance the spark and probably got it hot which might have promoted the crack quicker . It's in my winter service list and know that will cure the problem.
Check it all out and look for manifold issues, leaks, etc
Keep us posted
Larry Shepard

12-13-2015, 08:34 PM	#1
taffrail Senior Member Join Date: Dec 2010 Location: Hingham, MA Posts: 135	Backfire I have a small pop between shifts after it warms up, what should I check first, fuel or ignition.

12-13-2015, 08:38 PM	#2
jm29henry Senior Member Join Date: Sep 2010 Location: michigan Posts: 1,138	Re: Backfire Both probably running rich,but if timing is off or week spark both could cause your problem

12-13-2015, 08:43 PM	#3
Mitch//pa BANNED Join Date: May 2010 Location: Bucks County, PA Posts: 11,454	Re: Backfire Assuming your timing and points are both set to specs, usually running lean or retarded timing causes the little pops ,,,,,open the GAV a little more ... You can also try advancing the timing a little more... An exhaust leak can also make pops on decel Last edited by Mitch//pa; 12-13-2015 at 08:51 PM.

12-14-2015, 12:05 PM	#4
steve s Senior Member Join Date: May 2010 Location: Kalamazoo Posts: 1,656	Re: Backfire I will break the tie and vote for running too lean.

12-14-2015, 09:41 PM	#6
taffrail Senior Member Join Date: Dec 2010 Location: Hingham, MA Posts: 135	Re: Backfire Sponsored Links (Register now to hide all advertisements) The GAV and the spark didn't cure it, been getting louder , thought my hearing was coming back, I better check for leaks. Thanks for your help guys, I'll let you know.

12-14-2015, 10:08 PM	#7
larrys40 Senior Member Join Date: May 2010 Location: St Charles , Missouri Posts: 2,032	Re: Backfire I worked on a roadster recently that was doing the same thing and I had just serviced it and in looking at it the exhaust manifold was cracked underneath the intake . I believe the owner ran it and forgot to advance the spark and probably got it hot which might have promoted the crack quicker . It's in my winter service list and know that will cure the problem. Check it all out and look for manifold issues, leaks, etc Keep us posted Larry Shepard