06 500 EFI X2 won't start, backfires - Polaris ATV Forum
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post #1 of 12 (permalink) Old 09-03-2011, 10:37 PM Thread Starter
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06 500 EFI X2 won't start, backfires

I shut off the quad and now it won't start.
06 500 HO EFI X2

Turns over but won't run, smell fuel and I would get a backfire or two
Checked fuel- ok
Spark-ok
Injector- ok

Moved on to checking timing and valve lash clearance Ok, thought maybe the chain slipped, but timing is ok per service manual.

I am stumped at this point, could it be a sensor (cam) or something telling the computer to fire spark/fuel off time?

Thanks in advance for your brainpower. Hope I can get to the bottom of this.

-Mike
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post #2 of 12 (permalink) Old 09-04-2011, 06:29 AM
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Welcome to the board!

I tried setting my password to "penis" but it said my password wasn't long enough...
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post #3 of 12 (permalink) Old 09-04-2011, 07:29 AM Thread Starter
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Thanks Bruce! Great site, lots of good information.

I am going to keep digging in the service manual today to see if I can diagnose the run problem. No clue as of yet.

Thanks,

-Mike
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post #4 of 12 (permalink) Old 09-04-2011, 07:14 PM Thread Starter
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Bump.... Checked all of the sensors with ohm tests and voltage checks I am realy confused. It won't run just backfires. It's like timing is off but I have made sure it is dead on.

Need help.....
-Mike

Last edited by RedEarl; 09-04-2011 at 07:25 PM.
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post #5 of 12 (permalink) Old 09-05-2011, 08:07 PM
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bad gas? That was my problem. I bought a used Sportsman. Ran great the first day (took long to crank tho). Couldnt get it started the next day. It would crank and backfire. Mechanic said it was bad gas. Now I put seafoam in all my gas containers. Same crap happened to my generator.
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post #6 of 12 (permalink) Old 02-11-2012, 07:28 PM Thread Starter
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Still won't run

I have gone through the engine, checked top end out with caliper and everything is in spec. I am fearing the worst that it is electrical of the ecu....

I have codes
42
22
45
46

I am not sure what part to swallow next$$$ to figure out what is going on...

The quad has the same symptoms as my first post.. Back fires. Even out the intake. Will not fire correctly.

I hope someone can give me some advice on this, as I am not sure what to dig into next...

Thanks,

Mike
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post #7 of 12 (permalink) Old 02-11-2012, 08:33 PM
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Sounds like the ecm or whatever its called. Find someone close to you that has a 500 from 04.5 to 08ish and see if you can swap test.

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2007 sportsman 500 x2 efi
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post #8 of 12 (permalink) Old 02-11-2012, 08:40 PM
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This guy has a link for a pdf of the codes

http://www.atvnation.com/forum/index...5&#entry314235

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2007 sportsman 500 x2 efi
26" sadona ripsaws on 12" itp ss312's
3 headlight mod relay type
2500 Ib polaris winch
custom made "winch saver"
custom work light mod with lighted switch and 18 Watt lamps
custom stealth black shock covers
Front trunk locks Polaris Part #2874548 $7.50 each @ dealer
front rack rails converted to "U channel" strut for easy attachments
pure polaris HD front springs
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post #9 of 12 (permalink) Old 03-22-2014, 02:36 PM
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did you figure it out?

I'm having the exact same problem with my 08 sportsman 500, did you eve figure out what was wrong with your bike?
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post #10 of 12 (permalink) Old 03-22-2014, 05:25 PM
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Sounds like a timing issue to me. Good call on the test ECM swap if you can get your hands on one...?

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