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Thread: Fuel problem

  1. #1

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    Fuel problem

    Fuel is crazy rich on the AFR guage it is 10.0 and also flatlines then it dies and runs really rough spuratitly or it could run really good and I can be in it at WOT and it will just shut off. I have the static pressure at 34 psi which is where ROB from LB motorsports had suggested that I put it (after he did the reflash several years ago),

    Is there a fuse able link somewhere in the fuel sending unit that can go bad causing it to stay open? I have the Riva fuel pump with relay on the ski.

    I just think somewhere something is wrong telling it to deliver more fuel than needed just not sure what to check/ test. Any ideas you might have would be great.

    Thanks


  2. #2
    Got Boost? psycho rxp's Avatar
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    You might want to try to free air calibrate the 02 sensor, or replace it with a brand new one. If you’re getting 10.0 AFR, then you have way too much fuel, injector wise or pressure wise. You need to set the rising rate to around 11.7 to 11.9 at wide open throttle, regardless of the pressure.

    What are RRFPR are you using ?

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  4. #3

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    Thanks for responding, not sure of brand was one that came with the ski believe it is set at 34. I have the CMD Auto Tune on the ski but it doesn't kick in until after 30 seconds of ski running, so before it kicks in ski is at 10.0's on AFR then once it kicks in it just takes out tons of fuel. Second you hit the throttle goes rich again. I tried at idle to bypass the rrfpr and still ran exactly the same. At this point not sure if tune could be bad in ECU or BAD MPEM. I know I'm tired of chasing this problem been chasing it now for 3 summers. Thanks for any extra ideas.

  5. #4
    Got Boost? psycho rxp's Avatar
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    Quote Originally Posted by frogurt View Post
    Thanks for responding, not sure of brand was one that came with the ski believe it is set at 34. I have the CMD Auto Tune on the ski but it doesn't kick in until after 30 seconds of ski running, so before it kicks in ski is at 10.0's on AFR then once it kicks in it just takes out tons of fuel. Second you hit the throttle goes rich again. I tried at idle to bypass the rrfpr and still ran exactly the same. At this point not sure if tune could be bad in ECU or BAD MPEM. I know I'm tired of chasing this problem been chasing it now for 3 summers. Thanks for any extra ideas.
    You will have to manually tune the idle map, specifically where the start up cells are located while cranking. Start by removing 15% where the cells light up while cranking. It may take a few tries to get all the cells corrected, but should start much easier and idle smoother, Once adjustments in those areas Are made. Autotune only Makes corrections after u accept them to the map. It will take a few passes to keep making the changes and excepting them to the fuel map.

    What size injectors are you riding with his flash?

  6. #5
    Kosh's Avatar
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    As above, you need to turn off auto tune below 2000rpm and do that area manually.

  7. #6

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    Quote Originally Posted by psycho rxp View Post
    You will have to manually tune the idle map, specifically where the start up cells are located while cranking. Start by removing 15% where the cells light up while cranking. It may take a few tries to get all the cells corrected, but should start much easier and idle smoother, Once adjustments in those areas Are made. Autotune only Makes corrections after u accept them to the map. It will take a few passes to keep making the changes and excepting them to the fuel map.

    What size injectors are you riding with his flash?
    Running 80lb injectors, I'm not 100% versed on the CMD and feel like a idiot, how exactly do I remove 15% and what tab would I be under to remove it? I'm still reading up on and trying to understand it.
    On a side note the reason I bought the CMD is because it was running so rich at 10.0 and would die at WOT so I have had this problem for awhile and just get it figured out.
    Thanks so much for your help.

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