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2012 Joyner R2

Yourname

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Yourname Newbie

Yourname

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Hi everyone new to utv board

I have a 2012 Joyner R2 im having a loss of power unit idles fine and starts right up but bogs down around 2000 + rpms unit will then begin fluctuating high rpm low rpm Repeatedly under throttle  it’s  almost like it’s in a limp mode fuel line will stiffen and go back loose again I can see the pump look like it’s cutting on and off while this is happening  I I have changed all vacuum lines fuel lines changed FPR and fuel pump And also the injectors  and I have swapped out the TPS sensor 

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Dan B Community Regular

Dan B

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Things to look for:  Check your fuel pump pressure.  Should be a constant 50psi give or take a couple of psi's.  The pressure regulator might be going bad.  Ensure you have the full 12vdc to the fuel pump.  Check the fuel pump relay, also.  A loose wire or bad relay contact can cause intermitten fuel pump operation at higher RPMs (more vibration).  Fuel demands at idle are much less than at higher RPMs.  That's why it starts and idles fine.

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Neil Wilson Contributor

Neil Wilson

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On 10/29/2020 at 3:26 PM, Yourname said:

Thanks for the reply I just got a new fpr in today so swapping that now I will check all that you’ve mentioned much appreciated!!

You should be able to borrow a fuel pressure tester from your local auto parts store. Connect it between the pressure regulator and the injector rail. That is the sure way to know what is happening at the injector rail.

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