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Thread: Car has crazy erratic MAF readings, tried 3 MAF cards so far

  1. 08-30-2022 #1
    GrannySShifting
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    Car has crazy erratic MAF readings, tried 3 MAF cards so far

    They are not consistant, some pulls read pretty clean, next one doesnt. Thing shows constant little bits of knock on pulls even with extremely low timing, and I wonder if has anything to do with it. He said he built an intake and is using LS7 style MAF card but Ive had him try a couple, maybe needs to be in a straighter section of pipe... but its in the same spot all the time so why would readings be wild then cam then wild again is my thought

    7psi LSA on stock G8 motor, little cam with DOD delete I think it was. 10 degrees timing still seeing KR, up top on this pull you see crazy erratic MAF values... Supposedly wiring checks out, Im not near the car to go over myself
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    Factory Stock 97 SS M6 13.51 @ 104.3 mph
    Stock Longblock LS1 w/ 233/238 P.S.I. Cam
    10.81 @ 126.9 Full interior, six speed on 275 radials, a decade ago

    '99 TA trunk mounted 76mm 6 Liter
    9.0s in '09 @ 153 MPH

    Turbo 5.3 Volvo 740 Wagon
    32psi and still winding out 5th on the highway somewhere
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  2. 08-30-2022 #2
    smokeshow
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    If you zoom in, you can see the MAF is erratic all the time. Not every home-built intake tube is going to play nice.
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  3. 08-31-2022 #3
    jbeez
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    laminar air flow is crucial with a MAF. "built an intake", where is the MAF? Do you have any pics of this setup? 7psi, turbo? Blower? I'm going to assume you can't put the factory intake pipe on to test because of the new pipe arrangements, maybe an intercooler is in the mix now?
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  4. 08-31-2022 #4
    GrannySShifting
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    Quote Originally Posted by jbeez View Post
    laminar air flow is crucial with a MAF. "built an intake", where is the MAF? Do you have any pics of this setup? 7psi, turbo? Blower? I'm going to assume you can't put the factory intake pipe on to test because of the new pipe arrangements, maybe an intercooler is in the mix now?
    Its a LSA setup mentioned that in post, I didnt build the car or have seen it, but I assumed the way they did the air intake is not happy. Just never seen it quite that pronounced
    Factory Stock 97 SS M6 13.51 @ 104.3 mph
    Stock Longblock LS1 w/ 233/238 P.S.I. Cam
    10.81 @ 126.9 Full interior, six speed on 275 radials, a decade ago

    '99 TA trunk mounted 76mm 6 Liter
    9.0s in '09 @ 153 MPH

    Turbo 5.3 Volvo 740 Wagon
    32psi and still winding out 5th on the highway somewhere
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  5. 08-31-2022 #5
    Alvin
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    I"d go speed density and not look back.
    Tuner at PCMofnc.com
    Email tuning!!!, Mail order, Dyno tuning, Performance Parts, Electric Fan Kits, 4l80e swap harnesses, 6l80 -> 4l80e conversion harnesses, Installs
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  6. 09-03-2022 #6
    mememe123
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    SD or just blend it at 3k or wherever MAF starts being stable?
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  7. 09-06-2022 #7
    GrannySShifting
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    Quote Originally Posted by mememe123 View Post
    SD or just blend it at 3k or wherever MAF starts being stable?
    Its actually most unstable up top, which Ive never seen before
    Factory Stock 97 SS M6 13.51 @ 104.3 mph
    Stock Longblock LS1 w/ 233/238 P.S.I. Cam
    10.81 @ 126.9 Full interior, six speed on 275 radials, a decade ago

    '99 TA trunk mounted 76mm 6 Liter
    9.0s in '09 @ 153 MPH

    Turbo 5.3 Volvo 740 Wagon
    32psi and still winding out 5th on the highway somewhere
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  8. 09-07-2022 #8
    mememe123
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    I feel you, been going back and forth with RPM 5in intake on my V, and MAF is just all over the place. Super lean on slow take off, and super rich in cruising if I adjust it down low, and hybrid/blend won't idle at all no matter the switch point.
    It looks like SD is the way to go, atleast in my case. May be same for you ? Lol
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