popping and backfire

oldrampy · 07-13-2012, 07:57 PM

Just installed vance and hines slash cuts on 11 voyager now have pop and snaps when decelerating. any suggestions?

dholmer · 07-13-2012, 08:11 PM

Do you have a power commander or a cobra FI2000 installed? I believe after changing out your exhaust from stock to either a V&H or Cobra, and not adding one of those listed above, the popping noise is normal for that situation. I am sure others will jump in and expalin why this happens.

**cnc** · 07-13-2012, 08:24 PM

Or, leaks in the exhaust pipe connections.

poppy · 07-13-2012, 08:37 PM

It's likely caused by unburned fuel in the exhaust, common after installing new exhaust. You don't hear it with the OEM system. Gadget's site has the fix, worked for my '04, way before I installed a PCIII.

http://www.gadgetjq.com/smogstuffremove.htm

onesherpa · 07-13-2012, 10:23 PM

Try a couple of washers under the acorn nuts where the pipes attach to the engine. I had the same problem with my V&H.

**ringadingh** · 07-13-2012, 11:17 PM

You most likely have an exhaust leak at the header gaskets, sometimes it takes a couple attempts to get them to seal.

mrtelefoneman1 · 07-14-2012, 08:04 AM

As they are fairly inexpensive, I would get a new pair of crush gaskets if you didn't when you installed the new exhaust. Check the torque specs for the headers also.

RACNRAY · 07-14-2012, 09:31 AM

Quote:

Originally Posted by oldrampy

Just installed vance and hines slash cuts on 11 voyager now have pop and snaps when decelerating. any suggestions?

First to do is to plug up the hose that feeds air from the air box to the pair valve. This will eliminate air entering the exhaust ports on decel and will make an improvement in lessening
or eliminating popping on decel.

RACNRAY

poppy · 07-14-2012, 11:01 AM

Quote:

Originally Posted by RACNRAY

First to do is to plug up the hose that feeds air from the air box to the pair valve. This will eliminate air entering the exhaust ports on decel and will make an improvement in lessening
or eliminating popping on decel.

RACNRAY

Exactly, I used the marble method mentioned on Gadget's site and it worked fine.

oldrampy · 07-14-2012, 03:54 PM

looked at gadgets fix but i think the 1700 is different could that be possible

Brett814 · 08-18-2013, 06:45 PM

Is this also the case if you have the Vance and Hines slip-ons with the Dyno Jet PC on a new 2012 Vaquero?

Tcflame · 09-21-2013, 09:10 PM

Quote:

Originally Posted by oldrampy

Just installed vance and hines slash cuts on 11 voyager now have pop and snaps when decelerating. any suggestions?

I have the same issue after installing the V&H slash cuts. i also thought gadgets remedy was for an older carburated vulcan? did you ever find a resolution to the popping?

vulcanhunterbagger · 04-29-2014, 03:45 PM

I just installed vance and hines pro pipe chrome full system, made sure all bolts and nuts were tight, engine backfires on slow speed decelerating, 3-1 gear. No backfires on acceleration. Any suggestions????

dshelly · 04-29-2014, 04:49 PM

Quote:

Originally Posted by vulcanhunterbagger

I just installed vance and hines pro pipe chrome full system, made sure all bolts and nuts were tight, engine backfires on slow speed decelerating, 3-1 gear. No backfires on acceleration. Any suggestions????

Do you have an aftermarket intake or a fuel processor? Need more info.

dhobbs74 · 04-29-2014, 05:55 PM

Quote:

Originally Posted by RACNRAY

First to do is to plug up the hose that feeds air from the air box to the pair valve. This will eliminate air entering the exhaust ports on decel and will make an improvement in lessening
or eliminating popping on decel.

RACNRAY

You wouldn't happen to have a picture of this hose would you? I'm trying to figure out where it is on the air box

07-13-2012, 07:57 PM	#1
oldrampy Member Join Date: Jan 2012 Location: hadley,pa Posts: 64	popping and backfire Just installed vance and hines slash cuts on 11 voyager now have pop and snaps when decelerating. any suggestions? __________________ Jim hadley,pa. 2011 Voyager 1700 VBA. #01941 ROK Login or Register to Remove Ads
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07-13-2012, 08:11 PM	#2
dholmer Member Join Date: Aug 2011 Location: Utah Posts: 267	Do you have a power commander or a cobra FI2000 installed? I believe after changing out your exhaust from stock to either a V&H or Cobra, and not adding one of those listed above, the popping noise is normal for that situation. I am sure others will jump in and expalin why this happens. __________________ 2006 Nomad KawaNow #01849
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07-13-2012, 08:24 PM	#3
cnc Join Date: May 2009 Location: Montreal QC Posts: 12,034	Or, leaks in the exhaust pipe connections. __________________ Norm Ward 2008 blue / silver nomad kawanow / VBA #01136
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07-13-2012, 10:23 PM	#5
onesherpa Member Join Date: Aug 2008 Location: Wrentham, MA Posts: 55	Try a couple of washers under the acorn nuts where the pipes attach to the engine. I had the same problem with my V&H. Login or Register to Remove Ads
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07-13-2012, 11:17 PM	#6
ringadingh Join Date: Aug 2007 Location: Newmarket Ontario Canada Posts: 35,387	You most likely have an exhaust leak at the header gaskets, sometimes it takes a couple attempts to get them to seal. __________________ 2002 Nomad aka Bountyhunter VBA #27 VROC #18951
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07-13-2012, 08:37 PM	#4
poppy Advanced Member Join Date: Oct 2007 Location: Utah; 2004 Nomad 1500 Posts: 510	It's likely caused by unburned fuel in the exhaust, common after installing new exhaust. You don't hear it with the OEM system. Gadget's site has the fix, worked for my '04, way before I installed a PCIII. http://www.gadgetjq.com/smogstuffremove.htm
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07-14-2012, 08:04 AM	#7
mrtelefoneman1 Member Join Date: Oct 2010 Location: Zanesville, OH Posts: 315	As they are fairly inexpensive, I would get a new pair of crush gaskets if you didn't when you installed the new exhaust. Check the torque specs for the headers also.
	0

07-14-2012, 03:54 PM	#10
oldrampy Member Join Date: Jan 2012 Location: hadley,pa Posts: 64	looked at gadgets fix but i think the 1700 is different could that be possible __________________ Jim hadley,pa. 2011 Voyager 1700 VBA. #01941 ROK
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08-18-2013, 06:45 PM	#11
Brett814 Jr. Member Join Date: Aug 2013 Location: Houston, TX Posts: 3	Is this also the case if you have the Vance and Hines slip-ons with the Dyno Jet PC on a new 2012 Vaquero?
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04-29-2014, 03:45 PM	#13
vulcanhunterbagger Jr. Member Join Date: Apr 2014 Location: Calgary Alberta Canada Posts: 1	I just installed vance and hines pro pipe chrome full system, made sure all bolts and nuts were tight, engine backfires on slow speed decelerating, 3-1 gear. No backfires on acceleration. Any suggestions????
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