Exhaust popping on deceleration

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Jul 7, 2016 | 06:55 PM

Booey424

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From: Letart,WV

Exhaust popping on deceleration

I have had my 2009 Street Bob for 5 weeks now. The only thing I can tell that has been done to it are the V&H mufflers. It pops a lot on deceleration.

I changed the plugs and they were bone dry and white. Is it running to lean? And if so what can I do to fix it?

Will dyno tuning it with only the pipes do any good, or should I get a download and air intake upgrade? And then dyno tune it?.

It was much easier with my carb sportster.

Jul 7, 2016 | 07:03 PM

cggorman

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From: NW Ohio

I've never, ever regretted buying a full-featured user-adjustable tuning interface. The more control the better. They are the modern equivalent of needles, jets, and screwdrivers.

Jul 7, 2016 | 07:04 PM

CJD197

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Joined: Feb 2016

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From: Southlake Texas

2 possible causes. The first is a leak in the exhaust, including the gasket or cracks in the pipes. The second would be a lean mixture during overrun. The first should be fixed, but the latter doesn't hurt anything but can be tuned out if it bothers you.

Jul 8, 2016 | 02:10 AM

esteboatan

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Joined: Jul 2012

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From: Littleton, CO

I've had my 2011 SuperGlide Custom for about 5 weeks too now and just recently installed a Fuel Moto Micro Tuner. I was having popping issues on deceleration with the Bassani Pro Streets exhaust it has and I'm pretty sure the previous owner only did the HD Stage 1 remap on the fuel injection. The Micro tuner and the custom tune fuel moto supplied have cured the popping. Its so much smoother and has noticeable increase in throttle response plus the engine runs cooler now.
If your not going to do more than a stage one upgrade i would suggest the micro tuner from fuel moto. They are top notch to deal with and very helpful.

Jul 8, 2016 | 10:04 AM

Renoir1

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From: WI

Jul 8, 2016 | 02:11 PM

Warp Factor

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From: Detroit

Quote:

Originally Posted by Booey424

With modern computer controlled engines, and the better high-detergent gasolines, it's quite normal and acceptable to have plugs which are dry and white.

Back in the carburetor days, when fuel metering was much less accurate, it was more advisable to go more to the brown or black side on plugs, to cover your azz during all the anomalies.

Like someone else said, decel popping doesn't cause a problem. Nor is it an indication of the fuel/air ratio being off. Actually, it's more an indication of the ratio being pretty much correct, not that you can't reduce or eliminate decel pop by throwing the fuel/air ratio so far off that it won't ignite.

Jul 10, 2016 | 08:45 PM

jz78817

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Joined: Jun 2016

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From: Detroit area

AFAIK most vehicles will "pop" a bit on deceleration, but with stock (quiet) mufflers in place you'll never hear it. I had a Dodge SRT-4 (Neon) which came w/o mufflers from the factory; the turbo + resonator were enough to quiet it down. that car would pop on deceleration with the factory hardware, I never modded the car.

I put the SE Nightstick muffler on my Switchback, which is supposed to be 50-state legal and doesn't require a re-map, and it's popped a bit on decel. no big deal; if things are too out of whack your check engine light should come on.