My car use to do that when I had straight pipes in place of the resonator with my Billy Boat exhaust. Now with the x-pipe it doesnt do it any more...
New Exhaust-Pops Occasionally
Thread Starter
Drifting
Joined: Jun 2007
Posts: 1,454
Likes: 15
From: Martinsburg WV
New Exhaust-Pops Occasionally
Just had all the issues taken care of on my '88 and I also finished my exhaust-hedman elites to true duals in 2.5 pipes with an x-pipe into a pair of Spintech super pro street mufflers then to lt1 tips. Occasionally it makes a popping sound usually upon deceleration. Timing has just been checked and is good and I just installed Bosch III from FIC. Also just changed my header gaskets since one was leaking. I dont have any cats if that matters. Ive heard some people say this is normal with a 350 and no cats. Also have egr blocked off. Any ideas?
Last edited by armybyrd; Aug 20, 2010 at 01:07 AM.
Le Mans Master
Joined: Apr 2005
Posts: 6,413
Likes: 9
From: The Old Dominion
Yes, it sounds like you have headers into an x-pipe into free flowing mufflers.
If you want to get rid of the popping, you will need to tune out the DFCO (decel fuel cut-off). When you are on the gas hard, extra gas is pumped into the engine and out the exhaust. When you abruptly let off, fuel is cut off and fresh air flows into the exhaust. This allows the extra gas to burn, and a popping sound is heard. If you had short pipes, you might even see flames.
If you want to get rid of the popping, you will need to tune out the DFCO (decel fuel cut-off). When you are on the gas hard, extra gas is pumped into the engine and out the exhaust. When you abruptly let off, fuel is cut off and fresh air flows into the exhaust. This allows the extra gas to burn, and a popping sound is heard. If you had short pipes, you might even see flames.
Melting Slicks
Joined: Feb 2006
Posts: 2,753
Likes: 15
From: backwoods upstate ny
tiny air leak at a pipe joint will do this...usually will plug up with exhaust residue by itself and stop poppin' all by itself in a few hundred miles...harmless unless sneaking home late at night.
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Le Mans Master
Joined: Oct 2008
Posts: 9,758
Likes: 49
From: Houston Texas
I have some Fast Burn heads now just need to put it back together.
Burning Brakes
Joined: Aug 2006
Posts: 1,123
Likes: 1
From: Rockland County NY
Sorry armybyrd, didn't mean to hijack your thread.
Thread Starter
Drifting
Joined: Jun 2007
Posts: 1,454
Likes: 15
From: Martinsburg WV
good to hear...thanks! I've got the cam, a set of valve springs, tpis big-mouth intake, ported slp runners, a ported plenum and a chip all waiting to go in. It's already got headers and a corsa exhaust. When the weather starts to get crappy, I'll tear into it.
Sorry armybyrd, didn't mean to hijack your thread.
Sorry armybyrd, didn't mean to hijack your thread.
Pro
Joined: Jun 2010
Posts: 564
Likes: 0
From: West Fargo North Dakota
I always have hated the popping, it sounds so cheap to me. Like the company just said eff it when designing the exhaust. Personally the power you give up to have an exhaust that doesn't sound like some backwoods muffler shop tossed it together is well worth it.