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Supercharged P0171 still after 7th injector

Discussion in '3rd Gen 4Runners (1996-2002)' started by Nkurkov, Sep 8, 2019.

  1. Sep 8, 2019 at 2:08 PM
    #1
    Nkurkov

    #1
    Nkurkov [OP] New Member

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    I have a 99 4runner.
    I installed a supercharger 1st Gen with my freind. After the install the P0171 code appeared.

    I installed a 7th injector but still the code is there.
    Did a smoke test into into the intake by the manifold. No leaks. The hoses are all new.

    What could it be?
     
    Nkurkov, Sep 8, 2019
    #1
  2. Sep 8, 2019 at 5:07 PM
    #2
    4scooter19

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    4scooter19 New Member

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    Have you checked fuel pressure?
     
    4scooter19, Sep 8, 2019
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  3. Sep 8, 2019 at 5:28 PM
    #3
    gunsnob

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    gunsnob New Member

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    Kings Shocks, SPC UCA’s, Method MR702 rims, Toyo AT III’s in 285/70/17, Gobi Roof Rack, various Baja Designs lights.
    Have you checked the Olsen Coaxial Modem Cable?

    Just kidding, that's a line from McHale's Navy...

    Anyway.... according to the interweb, "The code is thrown when the oxygen sensors detect that there’s not enough oxygen in the exhaust system. This is commonly referred to as a “lean” condition."
     
    gunsnob, Sep 8, 2019
    #3
  4. Sep 8, 2019 at 5:33 PM
    #4
    4scooter19

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    4scooter19 New Member

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    It's either getting too much air or too little fuel. Looks like he's checked for vacuum leaks so it may not be getting enough fuel. I would check fuel pressure and clean the MAF.
     
    4scooter19, Sep 8, 2019
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    gunsnob likes this.
  5. Sep 8, 2019 at 5:39 PM
    #5
    SR5 Limited

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    SR5 Limited New Member

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    Ya I was gonna say running lean. Do they make an adjustable fuel pressure regulator yet. And you prob shouldn’t have gut your cat...
     
    SR5 Limited, Sep 8, 2019
    #5
    gunsnob likes this.
  6. Sep 8, 2019 at 5:46 PM
    #6
    4scooter19

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    4scooter19 New Member

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    OP what fuel pump are you running?
     
    4scooter19, Sep 8, 2019
    #6
  7. Sep 8, 2019 at 7:57 PM
    #7
    Nkurkov

    #7
    Nkurkov [OP] New Member

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    No didn't check the fuel pressure. That's a good point.
    I installed a new fuel pump that came with the 7th injector. I did clean the MAF sensor when installing the supercharger.
     
    Nkurkov, Sep 8, 2019
    #7
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