backfire after carb rebuild - The 1947 - Present Chevrolet & GMC Truck Message Board Network

johnwaynejeep · 02-15-2018, 12:07 AM

I rebuilt my carb recently and now I have a backfire through the exhaust when I mash and release the throttle.

It runs and idles smooth. I adjusted the mixture needles by leaning them out until the idle dropped, then I richened it by 1/4 turn. I did not adjust the timing during my carb rebuild.

Any ideas on what could be the cause?

cadillac_al · 02-16-2018, 06:44 AM

Are you sure you didn't play with the spark plug wires? It sounds like a crossed wire to me.

lowbucktrucks · 02-16-2018, 07:42 AM

check the accelerator pump,and the timing

02-15-2018, 12:07 AM	#1
johnwaynejeep Registered User Join Date: Jul 2014 Location: Pacific Grove, CA Posts: 105	backfire after carb rebuild I rebuilt my carb recently and now I have a backfire through the exhaust when I mash and release the throttle. It runs and idles smooth. I adjusted the mixture needles by leaning them out until the idle dropped, then I richened it by 1/4 turn. I did not adjust the timing during my carb rebuild. Any ideas on what could be the cause? __________________ Robert 1975 C10 - Huckleberry 2007 Jeep JK - John Wayne Jeep Smittybilt front/rear bumper, 10K winch Pacific Grove, CA

02-16-2018, 06:44 AM	#2
cadillac_al Registered User Join Date: Oct 2013 Location: Maine Posts: 2,376	Re: backfire after carb rebuild Are you sure you didn't play with the spark plug wires? It sounds like a crossed wire to me. __________________ 76 Chevy K20 76 GMC K15 77 Chevy C10 77 Chevy K10

02-16-2018, 07:42 AM	#3
lowbucktrucks Registered User Join Date: Dec 2014 Location: Buck creek, sc Posts: 90	Re: backfire after carb rebuild check the accelerator pump,and the timing



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