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Less pedal more throttle?

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  • #1

    Less pedal more throttle?

    Hey Guys,
    I'm new to the block and I could use your help...again.
    My '95 Formula, bought used from a lot, seems to nose over when I push the pedal all the way to the floor. If I let up off the pedal the slightest bit I get more power.
    I installed a K&N C.A.I. after I bought the car thinking it wasn't getting enough air. Though this did increase my take off response time I am still having the nosing over effect.
    It seems more noticable after I am up to speed. This could be because I have to concentrate a little harder at take off to keep the rear end where it is supposed to be (behind me) though.
    The car came with a cat back system so I would think it is getting rid of the bad air okay.
    Is this just a throttle adjustment?
    I am open to suggestions.

    Jeff
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  • #2
    Hmmmm.......never heard of that before. Could the throttle blades be bent??? Open the throttle blades all the way and look down into the throttle body. Check to see if they are perfectly horizontal. Could be electronic too - TPS out of wack maybe? ANyone else?
    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 )

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    • #3
      Check the 90-deg inlet elbow for tears. That would let air bypass the MAF on sudden throttle movement. It isn't unusual for the bottom of the elbow to roll under when you push it un the throttle body, and leave a gap, or for it to tear at that location.

      Might also be the throttle position sensor (TPS) as noted above. The computer is supposed to see the rapid TPS voltage increase, and add extra fuel... just like the accelerator pump on "ye olde" carburetor.
      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
        My bet is the TPS sensor.

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        • #5
          Thanks again guys,
          I am going to the garage to check the 90 degree angle.
          Where is the TPS located? Is there a way to test this...at home?

          Jeff

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          • #6
            I have to use a flash light and a long screwdriver to put the 90 degree inlet elbow on I start on the drivers side by hooking it on the throttle body and use the screwdriver to make the bottom go under the throttle body. If I don't the bottom will catch the edge and roll inside and leak.

            Here is the TPS http://shbox.com/1/tps.jpg

            I'm betting on the elbow.
            2002 Electron Blue Vette, 1SC, FE3/Z51, G92 3.15 gears, 308.9 RWHP 321.7 RWTQ (before any mods), SLP headers, Z06 exhaust, MSD Ignition Wires, AC Delco Iridium Spark Plugs, 160 t-stat, lots of ECM tuning

            1995 Z28, many mods, SOLD

            A proud member of the "F-Body Dirty Dozen"

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            • #7
              I don't see anything wrong with the 90 degree.
              I'm guessing to replace the TPS is just as cheap as testing it. I will try that.
              It is getting cold here. If I have to go to the garage again I am going to have to start the heater...brrrr.
              Thanks again guys.

              Jeff

              73 to the other Jeff (ham radio thing)

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