Lean

Discussion in 'All Topics, Chips, and Tech for Buicks' started by duber3, Jun 16, 2019.

  1. duber3

    duber3 Active Member

    Hi Eric
    Last year with my 42's injectors, the O2 was always at 760 at the track
    this year I only change my 42s for a set of 60s with a new chip
    My first run the O2 was at 730, I added WOT fuel per the chip and the O2 lowered
    everytime I added wot fuel the O2 lowered, my last run the O2 was at 700 and I had
    KR, can the walbro 340 pump not enough for the 60s??

    Thanks!
    Eric
     
    Last edited: Jun 16, 2019
  2. EricM

    EricM Administrator Staff Member

    The 340 is normally fine with the 60lb injectors.

    So everything else is the same as before? Same combo, same boost, fuel type?

    The basic things we normally check are fuel pressure at full throttle, and make sure the MAF reading (AF on a scanmaster), is hitting 255 at full throttle.

    Also make sure the O2 sensor is good.

    Regards,
    Eric
     
  3. duber3

    duber3 Active Member

    Hi Eric
    Yes everything else is the same, Today I changed the fuel filter just in cases, I opened it and it was like new, so it's not the fuel filter
    I test the car tonight at WOT, the o2 reading was 011 and the engine bugged, I have a good O2 sensor I will try it and check the AF on the scanmaster
    Thanks!
    Eric
     

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