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post #1 of 5 Old 06-21-2019, 10:36 PM Thread Starter
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2011 ranger 800 code 636 only after engine hot

Got a 2011 ranger xp 800.
Keeps throwing a code 636 (cps) but only does it after engine is hot and has been running a while. Starts to fit and sputter / hesitate like its not getting fuel but it throws the 636. My gut is telling me its not the cps but is actually a fuel delivery issue. Why only when hot though?
Are these susceptible to vapour lock? Or am I way off and should just snag a new cps?

Much thanks ahead crew.
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post #2 of 5 Old 07-01-2019, 10:19 AM
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Probably it is low on anti freeze. To help solve your problem elevate your front end and fill the radiator with 50/50 antifreeze until
it will not take any more. You will probably see it boil over several times until the radiator is actually full. The boiling over is the
air purging your system.

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post #3 of 5 Old 07-01-2019, 12:12 PM
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If code 636 comes active the fuel will be injected at wrong times
The CPS is the only engine timing sensor on the engine for the ecm and if anything throws off the timing it will set that code could be multiple things low compression in a cylinder, bad sensor, wiring or issue with tone ring on flywheel
And yes they have a hot fuel issue but I never had it throw a code just act like it's flooded

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post #4 of 5 Old 07-03-2019, 06:30 PM
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While it's running try moving around the injector wires. If it does it when you move them it's most likely going to need new injectors
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post #5 of 5 Old 07-14-2019, 04:24 PM Thread Starter
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Hey guys. Much thanks for the replies. Wasn't getting email updates saying anyone replied.

Anyways. Its acting like its not getting fuel. I put a new cps in it and when you drive it hard it starts to act up after its been running a while. It sputters and burps like its got a quick lapse in fuel delivery. Sometimes it throws the 636 before this happens and sometimes it happens and no code at all.

1) how would low coolant play a factor here?

2) it never does it at idle and to move the injector wires around when it does it would be difficult to time it at the same time as its doing it as its such small fits and burps.

I am pulling the fuel pump to check for clogged sock or a pump obstruction. I was thinking that there might be some shit in the tank that ends up clogging up the sock after ot runs a while as it clears up after it sits a while. Which may equal all the sediment falling away from the sock so it runs well again. It also could be because the engine has cooled as well so hard to tell.

The previous owner installed a bleed off valve of the fuel rail after the driver side injector because he said he was having a vapour lock problem. He didnt know which end of a wrench to use though so I'm not putting too much faith in his assessment.

Ill run a compression test when I pull the fuel pump and clean out the tank.

Wouldnt a bad tone ring cause an issue no matter what temp the engine is?

Thanks again crew.
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