popping noise - The 1947 - Present Chevrolet & GMC Truck Message Board Network

fossilrunner · 01-18-2005, 02:22 PM

I unbolted my exhaust yester day so it was running with just the maniflods.It was pretty loud but when I reved it up after I let off the gas it starter making a popping noise like it was back firing.Would this have something to do with the carburator or maybe the timing?

67ChevyRedneck · 01-18-2005, 02:59 PM

Does it pop with the exhaust on? I've always been told a motor needs a certain amount of "backpressure" to run right and taking off the pipes reduces that. Just what I've heard. I remember when I was a kid in NY that a lot of mufflers rusted and fell off cars and I seem to remember they "popped" under deceleration. I have no idea if it is true. But if it pops with the exhaust on then I would definately check the timing and carb adjustments. You didn't give much info to go on. Does it run bad, or idle high or low, power loss....etc???

Tx Firefighter · 01-18-2005, 04:13 PM

They all do that when you're running straight manifolds.

01-18-2005, 02:22 PM	#1
fossilrunner Registered User Join Date: Feb 2004 Location: FORT WORTH, TX Posts: 225	popping noise I unbolted my exhaust yester day so it was running with just the maniflods.It was pretty loud but when I reved it up after I let off the gas it starter making a popping noise like it was back firing.Would this have something to do with the carburator or maybe the timing? __________________ 71 chevy lwb w/ 350,750 holley 4150,edelbrock performer rpm,full 2 1/2 exhaust exit out side,6-8 drop,rally wheels.-SOLD 74 Chevy nova-355 with a little nitrous 78 GMC Jimmy 4x4-Factory 400 and all stock.

01-18-2005, 02:59 PM	#2
67ChevyRedneck Hittin E-Z Street on Mud Tires Join Date: Nov 2004 Location: Greenville, SC Posts: 23,090	Does it pop with the exhaust on? I've always been told a motor needs a certain amount of "backpressure" to run right and taking off the pipes reduces that. Just what I've heard. I remember when I was a kid in NY that a lot of mufflers rusted and fell off cars and I seem to remember they "popped" under deceleration. I have no idea if it is true. But if it pops with the exhaust on then I would definately check the timing and carb adjustments. You didn't give much info to go on. Does it run bad, or idle high or low, power loss....etc??? __________________ Jesse James 1967 C10 SWB Stepside: 350/700R4/3.73 1965 Ford Mustang: 289/T5-5spd/3.25 Trac-Loc 1968 Pontiac Firebird: Project Fire Chicken! 2015 Silverado Double Cab 5.3L Z71 2001 Jeep Wrangler Sport 4.0L 5spd 2020 Chevrolet Equinox Premium 2.0L Turbo 2011 Mustang V6 ~ Wife's ride American Born, Country by the Grace of God 1967 CST Shop Truck Rebuild! My 1967 C-10 Build Thread My Vintage Air A/C Install Project "On a Dime" Trying my hand at Home Renovation! 1965 Mustang Modifications!

01-18-2005, 04:13 PM	#3
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	They all do that when you're running straight manifolds. __________________ I'm on the Instagram- @Gearhead_Kevin

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