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Old 05-04-2013, 01:54 PM
Boburk's Avatar
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Location: TX
Posts: 1,281
backfire under deceleration

Just got back from checkning my feeders. On the way out of the woods my 2006 sportsman 500 x2 was backfiring out the exhaust under deceleration. Did it three or four times, but won't do it every time. Had the quad for about 18 months. Recent work had nothing to do with the engine (propshaft u-joints, rear brake master, right ball joint). I was in no water today, but did get stuck in the river last weekend...but probably road for an hour afterward with no problem. Had no problem on the way into the woods today...just on the way out. Going to pull the plug and put a new air filter on. Any input on the cause of this? Would the need for a valve adjustment do this?

Quad has 3500sh miles on it. I put about 1000 of those on it.

Sean
__________________
_____

2006 X2 500 (sold)
- Purchased in 2011 with 250sh hours and 2500sh miles
- 26" Trilobite HD tires on 12" SS108 rims
- Cabela's (Warn RT) 2500 winch
- Front rack extender
- Front brush guard

2008 Sportsman 300
- Purchased in 2012 with 25 hours on it
- UNI air filter
- Polaris 1500 winch

2011 X2 550
- Purchased in 2012 with 58 hours on it
- Polaris 2500 winch
- Front lock and ride storage box
- Bighorn 2s all around

2012 RZR 570
- Purchased Dec 2013
- Viper Elite 3500 winch.

Last edited by Boburk; 05-06-2013 at 04:16 AM.
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  #2 (permalink)  
Old 05-04-2013, 02:05 PM
Boburk's Avatar
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Location: TX
Posts: 1,281
It is EFI and has EBS. I pulled the plug, and it looks okay. I will replace it anyway.

Sean
__________________
_____

2006 X2 500 (sold)
- Purchased in 2011 with 250sh hours and 2500sh miles
- 26" Trilobite HD tires on 12" SS108 rims
- Cabela's (Warn RT) 2500 winch
- Front rack extender
- Front brush guard

2008 Sportsman 300
- Purchased in 2012 with 25 hours on it
- UNI air filter
- Polaris 1500 winch

2011 X2 550
- Purchased in 2012 with 58 hours on it
- Polaris 2500 winch
- Front lock and ride storage box
- Bighorn 2s all around

2012 RZR 570
- Purchased Dec 2013
- Viper Elite 3500 winch.

Last edited by Boburk; 05-04-2013 at 04:04 PM.
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Old 05-04-2013, 08:39 PM
Boburk's Avatar
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Location: TX
Posts: 1,281
Dealer was closed before I got there, so no new air filter (will pick one up Tuesday when they reopen). Put a new NGK plug in it and ran the piss out of it in my backyard, through numerous cycles of the cooling fan coming on and off, and could not get it to do it again.

Odd thing is, when I first got it home (before the plug change), the idle on it was stuck at 2400-3000 RPM for a little while. Had to bump the throttle numerous times to get it to settle back down to 1200sh. I don't see how that can be caused by a spark plug.

Anyhow, guess I will see if it does it again next time I take it out to the woods.

As an FYI, we were riding 2 up and had about 150 lbs of corn/gear on the ATV along with the two of us. That was on the way in. On the way out it was just the two of us and about 30 lbs of gear.

Sean
__________________
_____

2006 X2 500 (sold)
- Purchased in 2011 with 250sh hours and 2500sh miles
- 26" Trilobite HD tires on 12" SS108 rims
- Cabela's (Warn RT) 2500 winch
- Front rack extender
- Front brush guard

2008 Sportsman 300
- Purchased in 2012 with 25 hours on it
- UNI air filter
- Polaris 1500 winch

2011 X2 550
- Purchased in 2012 with 58 hours on it
- Polaris 2500 winch
- Front lock and ride storage box
- Bighorn 2s all around

2012 RZR 570
- Purchased Dec 2013
- Viper Elite 3500 winch.
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  #4 (permalink)  
Old 05-04-2013, 08:47 PM
Corbett1973's Avatar
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Join Date: Oct 2011
Location: Florence WI
Posts: 1,928
Your injector may be a little dirty. Add a little Seafoam to the gas & see if that helps.
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Old 05-05-2013, 08:17 AM
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Location: North Carolina
Posts: 267
On my motorcycle the nuts on the exhaust pipe had worked loose and it would pop back on decell. The thing wouldn't do it every time. Check all the exhaust joints for any sign of leakage. Also if its EFI you may want to get some spray cleaner and clean the throttle bore. Will suggest to make sure it is safe for map sensor type, that way it shouldn't mess anything up. OK, around here we only haul corn for three things...deer,turkey or liquor when we leave it in the woods...lol

Last edited by dyna105; 05-05-2013 at 08:20 AM.
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Old 05-05-2013, 08:55 AM
Boburk's Avatar
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Quote:
Originally Posted by dyna105 View Post
On my motorcycle the nuts on the exhaust pipe had worked loose and it would pop back on decell. The thing wouldn't do it every time. Check all the exhaust joints for any sign of leakage. Also if its EFI you may want to get some spray cleaner and clean the throttle bore. Will suggest to make sure it is safe for map sensor type, that way it shouldn't mess anything up. OK, around here we only haul corn for three things...deer,turkey or liquor when we leave it in the woods...lol
I have not noticed a change in sound, but will give the exhaust a look over.

Right now it is hogs. Have seen some turkeys and deer on the cameras...but the goal is to get hogs right now.

Sean
__________________
_____

2006 X2 500 (sold)
- Purchased in 2011 with 250sh hours and 2500sh miles
- 26" Trilobite HD tires on 12" SS108 rims
- Cabela's (Warn RT) 2500 winch
- Front rack extender
- Front brush guard

2008 Sportsman 300
- Purchased in 2012 with 25 hours on it
- UNI air filter
- Polaris 1500 winch

2011 X2 550
- Purchased in 2012 with 58 hours on it
- Polaris 2500 winch
- Front lock and ride storage box
- Bighorn 2s all around

2012 RZR 570
- Purchased Dec 2013
- Viper Elite 3500 winch.
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  #7 (permalink)  
Old 05-05-2013, 09:19 AM
Turbo_Brick's Avatar
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Location: Winnipeg,Mb
Posts: 106
I would recommend checking the air filter for sure. My XP will backfire when the filter gets dirty. Plus its a simple and cheap solution to the problem so thats always the best way to begin your diagnosis.
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Old 05-05-2013, 11:28 AM
Boburk's Avatar
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Join Date: Jul 2012
Location: TX
Posts: 1,281
Quote:
Originally Posted by Turbo_Brick View Post
I would recommend checking the air filter for sure. My XP will backfire when the filter gets dirty. Plus its a simple and cheap solution to the problem so thats always the best way to begin your diagnosis.
Thanks. It needs one. I will pick one up Tuesday when the dealer opens next.

I was thinking (hoping) that it was something simple like a plug or filter. Plug idea from thinking it was not sparking for a rev or two, then sparked causing the raw fuel in the exhaust to light off. And the filter being the same concept...choking off the airflow causing the plug to foul.

Sean
__________________
_____

2006 X2 500 (sold)
- Purchased in 2011 with 250sh hours and 2500sh miles
- 26" Trilobite HD tires on 12" SS108 rims
- Cabela's (Warn RT) 2500 winch
- Front rack extender
- Front brush guard

2008 Sportsman 300
- Purchased in 2012 with 25 hours on it
- UNI air filter
- Polaris 1500 winch

2011 X2 550
- Purchased in 2012 with 58 hours on it
- Polaris 2500 winch
- Front lock and ride storage box
- Bighorn 2s all around

2012 RZR 570
- Purchased Dec 2013
- Viper Elite 3500 winch.
Reply With Quote
  #9 (permalink)  
Old 05-06-2013, 02:00 AM
Devil's Avatar
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Member #35166
Join Date: Mar 2013
Location: Australia
Posts: 16
Quote:
Originally Posted by dyna105 View Post
On my motorcycle the nuts on the exhaust pipe had worked loose and it would pop back on decell. The thing wouldn't do it every time. Check all the exhaust joints for any sign of leakage. Also if its EFI you may want to get some spray cleaner and clean the throttle bore. Will suggest to make sure it is safe for map sensor type, that way it shouldn't mess anything up. OK, around here we only haul corn for three things...deer,turkey or liquor when we leave it in the woods...lol

I had a similar problem with a exhaust leak through a tiny hole in the pipe had the pipe replaced under warranty and no more backfiring.
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Old 05-07-2013, 05:04 PM
Boburk's Avatar
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Join Date: Jul 2012
Location: TX
Posts: 1,281
Well...it kind of did it again last night. Was about 5 miles into the ride into the woods. It dies on me after I started up after stopping at one of the feeders. Started back up but ran different. Popped once. Then about a half mile later it died. Tried to get codes from the check engine light and could only get 12 and 61. After a couple attempts at restarting and trying to get codes from the check engine light, the display went blank. Left it off for a bit...started and died, then blank again. Turned it off for awhile, when trying to restart got a check engine and battery faults, then blank. Checked battery cables...both tight, but loosened and retightened the positive. It started and ran normal the rest of the way in, and all the way out. Took it apart today and sanded the battery terminal with some 100 grit and put dielectric on it...will see what happens next time into the woods. As an FYI, I had to remove the battery when I worked on the propshaft.

Sean
__________________
_____

2006 X2 500 (sold)
- Purchased in 2011 with 250sh hours and 2500sh miles
- 26" Trilobite HD tires on 12" SS108 rims
- Cabela's (Warn RT) 2500 winch
- Front rack extender
- Front brush guard

2008 Sportsman 300
- Purchased in 2012 with 25 hours on it
- UNI air filter
- Polaris 1500 winch

2011 X2 550
- Purchased in 2012 with 58 hours on it
- Polaris 2500 winch
- Front lock and ride storage box
- Bighorn 2s all around

2012 RZR 570
- Purchased Dec 2013
- Viper Elite 3500 winch.
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