s14 running lean

Thread in 'Technical Questions' started by sideits14, Dec 1, 2019.

  1. sideits14

    sideits14 New Member

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    Hi i have a 1996 s14 .
    it is chipped stage1a
    it is running lean on full boost on the roller
    fuel pressure is holding really well.
    it has fmic
    turbo back exhaust
    walbro 255 pump
    holds 1 bar boost well
    air filter
    running on 97 Oct fuel
    injectors are good
    spark plugs are new
    any one got any ideas what it could be?
    thanks
     
  2. BenRice

    BenRice Well-Known Member

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    Have you measured your voltage? That's the only real thing i can think of, unless the injectors are partially blocked (so could be worth pulling them out for a clean)
     
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  3. sideits14

    sideits14 New Member

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    Voltage round the car good. I changed the old plugs and there wasnt any sign of a injector mucking around.
     
  4. BenRice

    BenRice Well-Known Member

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    What is the voltage at the pump? Has the pump been hard-wried or still running on the old factory wiring?
     
  5. sideits14

    sideits14 New Member

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    Hi pump hold 4.5 bar solid on full boost. Factory wiring I believe
     
  6. BenRice

    BenRice Well-Known Member

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    Just to confirm though, you haven't pulled the injectors out and had them cleaned?

    Also, what were you using to measure AFR's? Your own gauge in the car or the dyno's AFR gauge?
     
  7. r3k1355

    r3k1355 Well-Known Member

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    The 1a chip runs the stock stuff right to it's limits, so if something is not quite 100% you're going to get problems.
    The injectors might seem alirte, but they're also 23 years old and have not been cleaned and flow-benched, so start there.

    Also how do you know fuel pressure is ok?
    The chip is written for the stock FPR, have you swapped that out for something else?
     

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