Hi There. I have a 2007 sportsman 800 that has trouble idling and revving up. Once I give it throttle slowly it will rev up and run good at high rpms. If i apply the throttle quickly it will just backfire and die.

I put new plugs and wires on it. Replaced the TBAP sensor harness (saw a bare wire). The previous owner replace the injectors/wires (probably didnt need to). I trace every wire back to the ecu and tested it with my ohm meter for continuity and all check out ok (tbap and tps). I also checked the crank sensor for bare wires and all ok.

The codes I get are 41 45 51 and 52. I am at a loss I checked for wiring problems around the ecu and fuse block, swapped relays, visually checked the spark all okay. Sprayed carb cleaner around the intake and throttle body checking for leaks, okay. I cleaned the TBAP sensor itself with contact cleaner. Fuel pressure is right at 39 PSI. Hooked up test light to injector wires just to make sure they are pulsing on/off and they are ok Plugs are black and exhaust is rich.

I am now at a loss. Could it be the ECU or coil packs?

Let me know any help is appreciated!

 

HI did you ever find out what was wrong? I am having the same issues?