Fi Tech issue

Discussion in 'High Tech Retrofits' started by wiseryder, Jul 22, 2018.

  1. wiseryder

    wiseryder Veteran Member Lifetime Gold Member

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    Hey guys that have these things, Ive had mine on for almost 2k miles,thing has worked flawlessly,
    Driving home the other night It all a sudden devoleped a flutter on acceleration.
    it runs and drives but wont run hard anymore,
    I thought at first it was a ignition problem, tried a different dist.
    I gotta think its a fuel problem, but I dint know what to check, everything looks the same on the handheld as before ,
    anybody got any thoughts on this? I need some help here guys
    Thanks Scott
     
  2. redriderjf87

    redriderjf87 Veteran Member

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    I'd pick one of the handheld datalog screens and log a drive where you can re-create it. My personal guess is that it's going lean right when you step on it and then the ecu is compensating after the fact and flooding it rich for the next few seconds. If that's the case then it may be a matter of seeing if you're not holding 58 psi for some reason.

    Or otherwise, I have a thread I posted on some software issues I found that was causing me fuel delivery issues for the 2 years I've owned mine. But yours being just a recent issue makes me wonder if something physically changed. Do you have a FCC or in-tank pump?

    Unfortunately FiTech can't monitor the fuel pressure directly but it sounds like it's not too bad to hook up a transducer to log separately worst case.

    Feel free also if you want to attach a log csv file.
     
    Last edited: Jul 22, 2018
  3. wiseryder

    wiseryder Veteran Member Lifetime Gold Member

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    I kinda hear ya, but this car will rev right up high in park.
    I've changed all ignition pieces, no change, it happens under load
    Im stumped, dont make sense
     
  4. wiseryder

    wiseryder Veteran Member Lifetime Gold Member

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    I forgot to add , Has a inline pump from FiTech
     
  5. 79T/Aman

    79T/Aman Veteran Member NastyZ28 Sponsor NazstyZ28 Sponsor Lifetime Gold Member

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    with no load it will rev fine even if your fuel pressure is low, as stated above check your fuel pressure Chinese parts fail for no reason.
     
  6. wiseryder

    wiseryder Veteran Member Lifetime Gold Member

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    yep, Im thinking so too. Im going to buy a new pump so I can find out
    Theres no way that I know of to check FP on these things
     
  7. earnhardtgm3

    earnhardtgm3 Veteran Member

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    Did you check your fuel pre filter before FITech. If you installed one.
     
  8. wiseryder

    wiseryder Veteran Member Lifetime Gold Member

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    Yes I did, Fitech told me to remove it and drive it . to see what the AFR's do, they went up. New tank with in tank pump will be here today
     
    John Wright likes this.
  9. 8pack

    8pack Veteran Member Lifetime Gold Member

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    Go to Chevelles.com in the EFI section and see what they have to say. Those guys seem to have a lot of experience and know most of the issues that occur with the Fitech Units
     
  10. Joekool

    Joekool Veteran Member

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    Fuel trim is your best indicator of what the computer is trying to do. If it's negative then you have a rich condition, if it's positive you have a lean condition.

    I'd pull the spark plugs and see if any are fouled and what color the electrode has (gray, light brown, black).
     

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