Fuel Pressure, air filter, TAP sensor, foul ed spark plugs or spark arrestor...

What year and model is it???

 

Its a 2008.5 800

i can change the plugs, haven't tried that. What is a TAP sensor?

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It's the sensor on the air cleaner and it gets dust, dirt, oil etc on it and doesn't read correctly...

The spark arrestor can cause these symptoms too...

 

It almost seems like its slowly starving for fuel. once its hot it takes longer to starve.

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Fuel pump or spark arrestor causes this...

 

I have the emp intake on there and have run it without the airfilter to test for air starvation. It did not change the condition.

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Fuel Pump or Spark Arrestor...

 

fuel cap or breather:question:

 

The fuel cap isn't vented, if the breather was plugged it should happen continually not only when warm or hot...

 

Im going to try and clean spark arrestor and TAP sensor. And pull skidplate and look for any vent lines that may be plugged. Seems ut started this after reinstalling skidplate. Although like i said you cat notice it if going slow. THANK YOU EVERYONE. ILL LET U KNOW HOW I MAKE OUT.

Keep ideas coming.

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Simple question... What is your fuel pressure when this happens???

 

I do not have A fuel pressure gage . I changed the fuel pump to and Alba last weekend. Did not solve problem. But like i said it take 15 to min of riding before you notice a problem.

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How do u get the spark arrester out? thing is mildly rusted in there and all u got is the screw to grab.

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I have heard of people using j hook spring pullers to remove them. I personally I never removed mine. I guess I should.

Drew

Once again I'm on my phone instead of riding!!!

 

Im wondering if there is a vent that is plugged somewhere. I did not get to work on it after my last post. Spark arrestor looks pretty clean though. Walmart does not carry the Champion rc7yc3 Spark plug and there is no cross reference that i could find.


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Did you sort it?

 

Negative. Been busy. Back into her last couple nights. Changed spark plugs. No help. Seemed to make it worse in fact. Now it stutters hard at the start. I pulled air intake sensor. Looks pretty clean. Any other ideas? i put my hand over the air intake and when it studders , it actually blows air back out at my hand. Open the throttle and smooth out and sucks lots of air. Exhaust pressure feels pretty strong. Any ideas? please help!

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I'm going to get some Seafoam and some Marvel Mystery Oil and see what happens.

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I would have bet $$$ it was the fuel pump. hmmm

 

I would have bet fuel pump as well. I'd put the old fuel pump back in, just to make sure you don't have a bad replacement pump. After that, it sounds almost electrical, but if it isn't "moving" and it still sputters, then hmmmmm? I can't wait to hear the outcome of this one, cause I'm sure one of us will run into it at some point (knock on plastic).

 

If it was a full size car I'd say main bearings. Heat expanding closing clearances. But you will also loose oil pressure from that. Are you sure its not coming from the tranny? Does it feel like there is heavy resistance like the brakes are stuck? Then its most likely a bearing in the drive line. I agree with swingarm though check fuel pressure make sure the pump isn't bad.

 

Well i drained some oil out and put about 1/2 a quart of marvel mystery oil in crankcase. I put 1/2 that amount into a nearly empty gas tank as well as a full bottle of sea foam. Then i filled the tank. Took about 4 gallons and just let it idle for about an 1.5 hours Friday, and then about 1.5 hours on sat. the hesitation is gone warm or cold. I road it around yard for about 5 min and it seems perfect. But i did not have. Time to run it for any longer this weekend. So so far so good. Ill have to take time to give it a true test of the lose of power. I think its possible that crap/water may have dropped into cylinder head when i removed spark plugs( changed to ngk) after gunk. And pressure washing. I also noticed that my air intake "Ferco" style fitting between the emp. Intake and the throttle body was not connected as well as i left it when installing the emp. Certainly could have been picking up air there that would throw off the air flow sensor reading. i realligned and fixed up the gear clamps that hold that rubber fitting while i was in there. That may actually have been a big contributter to my problem. There was an oily black fluid on the intake side of the throttle body. Who know what kind of bad air got sucked in there. Im not going to change the fuel pump back out. I doubt it was faulty. Ill keep the original for a spare. I also went through the machine when the plastics were off. There is nothing pinched. So as far as i know its fixed but i won't really know until i get in it for a half hour or better. With hunting season around the corner, may not happen for a while. Thanks for all the help everyone. I will update after i get some hours on it.

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Thank you so much for giving us a detailed description of what you did, like I said, somebody will run into this again. If you can, take a pic of your ride with all the plastic off. I've wondered what it would be like to run a "naked" RZR like a naked sport bike. Good call on self diagnosis...you kind of talked your way through this one...and glad it wasn't a big $$$ mess.

 

I agree. Sometimes that's all it takes.... Extra set of ears.. I had already reassembled everything before taking pics.

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Lose of power is back :-( runs great when. Cold but once warm does not make power. Idels and runs fine at low rpm, but does ot make power after running for 10-15 min. Guess I did not figure our after all. :-(

 

I'd still guess starving for fuel. Some restriction in fuel line ? Is there a fuel filter anywhere on these ?

 

Not sure. have to pull skid plates and plastic and trace lines. :-(

 

When you lose that power take the gas cap off and see if you regain power.


KCCO

 

Have you checked compression on the cylinders?