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  • #1

    MAF problems, need advice.

    My car is feeling sluggish, almost as it was before I replaced the fuel pump. I looked at my MAF readings on the scanner. This is the 95 PCM programmed by MadZ28.com. The MAF is reading 9 g/sec at idle, but it maxes out at 99.9 g/sec at about half throttle and doesnt go any higher with more throttle. If im not mistaken, it should be much higher than this. Do you guys think its a bad MAF or something else? Filter is clean, and no air leaks.

    If I do have to replace the MAF, is it worth it to buy one of those fancy granatelli sensors? Anybody have any experience with those??
    96 WS6 Formula: Ram Air, 383 Stroker, Ported LT4 Heads and Manifold, 1.6 Crane Rollers, 58MM T.B., AS&M Headers, Borla Exhaust, Meziere Elec. H2O Pump, Canton Deep Sump Oil Pan, 100 HP OF TNT N2O!! , T56 Conversion w/ Pro 5.0 shifter, SPEC Stage 3 Clutch, Hotchkiss Subframe Conn., Lakewood Adj. Panhard Bar, Spohn Adj. LCA's, BMR Adj. T.A., Custom 12 bolt w/ 3:73's, Moser Axles, Eaton Posi, Moser Girdle
    11.6 @ 123mph (1.6 60' - getting there )
    Tags: None
  • #2
    Too bad you aren't closer, I would loan you a MAF to see if that was the problem. Aftermarket pcm tuners hate non factory MAFs. It screws with their calibrations. With your additional cubes you might see an airflow gain with either a ported stocker or aftermarket the question is whether your program will like it.

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    • #3
      On a stock engine, you would see upwards of 240gps at WOT/max RPM. Obviously, your engine should flow even more. If you are only seeing 99.9gps, I would first check to make sure you are looking at the correct sensor on your scanner. 99% for TPS, or 99kPa for MAP would not be unusual.

      Assuming it is your sensor, I would use a stock replacement. The Granatelli is not worth it. The main "feature" of the Granatelli is a screwed up flow calibration that under-reports air flow at WOT, and helps lean out a stock tune. But you should "tune" with the program in your PCM, not by relying on a band-aid like an intentionally miscalibrated MAF. Most aftermarket tuners don't want anything to do with a Granatelli MAF.
      Fred

      381ci all-forged stroker - 10.8:1 - CNC LT4 heads/intake - CC solid roller - MoTeC engine management - 8 LS1 coils - 58mm TB - 78# injectors - 300-shot dry nitrous - TH400 - Gear Vendor O/D - Strange 12-bolt - 4.11's - AS&M headers - duals - Corbeau seat - AutoMeter gauges - roll bar - Spohn suspension - QA1 shocks - a few other odds 'n ends. 800HP/800lb-ft at the flywheel, on a 300-shot. 11.5 @ 117MPH straight motor

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      • #4
        Thanks guys. I will check to make sure I am looking a the MAF for sure. Im 99% sure I was, but who knows. Anyways, I will stay away from the granatelli, if I wind up changing it. Im gonna go test drive now.
        96 WS6 Formula: Ram Air, 383 Stroker, Ported LT4 Heads and Manifold, 1.6 Crane Rollers, 58MM T.B., AS&M Headers, Borla Exhaust, Meziere Elec. H2O Pump, Canton Deep Sump Oil Pan, 100 HP OF TNT N2O!! , T56 Conversion w/ Pro 5.0 shifter, SPEC Stage 3 Clutch, Hotchkiss Subframe Conn., Lakewood Adj. Panhard Bar, Spohn Adj. LCA's, BMR Adj. T.A., Custom 12 bolt w/ 3:73's, Moser Axles, Eaton Posi, Moser Girdle
        11.6 @ 123mph (1.6 60' - getting there )

        Comment

        • #5
          Well, I was looking at right sensor. However, 99.9 is the max reading the stupid P.O.S. scanner will give me. This car is really frustrating. Theres nothing like having a new engine, but not running right. Im going to try another MAF from another car and see. If not, im putting another fuel pump in it.
          96 WS6 Formula: Ram Air, 383 Stroker, Ported LT4 Heads and Manifold, 1.6 Crane Rollers, 58MM T.B., AS&M Headers, Borla Exhaust, Meziere Elec. H2O Pump, Canton Deep Sump Oil Pan, 100 HP OF TNT N2O!! , T56 Conversion w/ Pro 5.0 shifter, SPEC Stage 3 Clutch, Hotchkiss Subframe Conn., Lakewood Adj. Panhard Bar, Spohn Adj. LCA's, BMR Adj. T.A., Custom 12 bolt w/ 3:73's, Moser Axles, Eaton Posi, Moser Girdle
          11.6 @ 123mph (1.6 60' - getting there )

          Comment

          • #6
            Its the MAF!! I tried the MAF out of a former student's car - thanks Darkz711! It ran pretty hard and the O2 readings were over .9 volts again.

            One problem - my MAF is ported. The previous owner did the porting though. Just looking at the unported vs. the ported, theres gotta be a huge difference in airflow, so I want to port the new sensor. ANybody ever gone about this before? Whats the best way to do it?

            Can I just use my old housing and swap the electronics?
            96 WS6 Formula: Ram Air, 383 Stroker, Ported LT4 Heads and Manifold, 1.6 Crane Rollers, 58MM T.B., AS&M Headers, Borla Exhaust, Meziere Elec. H2O Pump, Canton Deep Sump Oil Pan, 100 HP OF TNT N2O!! , T56 Conversion w/ Pro 5.0 shifter, SPEC Stage 3 Clutch, Hotchkiss Subframe Conn., Lakewood Adj. Panhard Bar, Spohn Adj. LCA's, BMR Adj. T.A., Custom 12 bolt w/ 3:73's, Moser Axles, Eaton Posi, Moser Girdle
            11.6 @ 123mph (1.6 60' - getting there )

            Comment

            • #7
              Originally posted by N20LT4Bird

              Can I just use my old housing and swap the electronics?
              Yup. The only exception is that the center plastic portion that carries the referance wires will not be modified. Only a slight reduction in airflow.

              Comment

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