The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - Lot's of popping and cracking on deceleration...

OhioDan · 05-15-2009, 04:59 PM

I always heard from my grand-dad, that it was from sucking cold air back into the muffler, allowing the unburned fuel to burn in the muffler causing the popping and cracking. Does you exhaust stop after the muffler? Might look into putting a short extension after the muffler?

05-15-2009, 04:59 PM	#8
OhioDan Registered User Join Date: Apr 2002 Location: New Carlisle, Ohio,USA Posts: 1,404	Re: Lot's of popping and cracking on deceleration... I always heard from my grand-dad, that it was from sucking cold air back into the muffler, allowing the unburned fuel to burn in the muffler causing the popping and cracking. Does you exhaust stop after the muffler? Might look into putting a short extension after the muffler? __________________ LIFE AIN'T EASY WHEN YER FAT AND GREASY! GMC= Got More Class! 1970 GMC LWB, Fleetside, 350/4spd, Flowmaster "40's", 2002 GMC 16" Rallies, cowl hood,and added a bunch of options that weren't there when I started.