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3.8 Sputters under load/acceleration

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  • 3.8 Sputters under load/acceleration

    (97' 3.8L camaro, manual trans, odometer reads 383046, but it has read that number since 2009. Engine was replaced probably around that time with a used one. Unknown actual miles on engine.)
    It started last week after driving for about an hour. Got off the expressway and when I went into third gear and tried to accelerate, it cut out and then began to sputter. Since then, any time I try to accelerate more than slightly faster than a snail, it sputters and cuts out, but has not yet stalled. So far, I have replaced/checked:
    plugs, wires, coils (replaced 2 of the three), ICM (Tested OK), Cam Position Sensor, TPS, MAF, IAC, Fuel Pressure is good, all injectors are firing.
    I hate to even think it, but could it be the timing chain? I haven't checked the timing with a light, but I will rent one tomorrow and check it.
    WHAT CAN IT BE?
    sigpic

    Ambitious but Rubbish
    Even in the Slomaro (Bessy), a Squeeling Tire is a Happy Tire.

  • #2
    I'm still betting ICM. Maybe a member here can swap ICM & coils with you for a few minutes just as a diagnostic test.
    -Joel
    1995 Z28 M6 - AI226/234 - autocross ricer
    1984 Scottsdale K10 - 305/4bbl/4spd


    WTB List:Midwest Chasis DS Loop

    Comment


    • #3
      I went through two ICMs from autozone. and got mine tested. No change
      Replaced 2 of the three coils, and I'm confident that the third is OK.
      sigpic

      Ambitious but Rubbish
      Even in the Slomaro (Bessy), a Squeeling Tire is a Happy Tire.

      Comment


      • #4
        Ah, well shit....
        -Joel
        1995 Z28 M6 - AI226/234 - autocross ricer
        1984 Scottsdale K10 - 305/4bbl/4spd


        WTB List:Midwest Chasis DS Loop

        Comment


        • #5
          still have cats?
          did you check fuel pressure while drving\during the issue

          Comment


          • #6
            Do you still have EGR B's V6 did that when EGR went bad.
            sigpic
            1998 Trans Am Convertible A4 - WS6 hood, WS6 air lid, WS6 rims, drilled/slotted rotors.

            Comment


            • #7
              Fuel pressure is constant throughout. Still have cats, but my speed is not limited. Egr was all replaced by previous owner a couple years ago
              sigpic

              Ambitious but Rubbish
              Even in the Slomaro (Bessy), a Squeeling Tire is a Happy Tire.

              Comment


              • #8
                Was EGR replaced or eliminated? Replaced--could have gone bad.
                sigpic
                1998 Trans Am Convertible A4 - WS6 hood, WS6 air lid, WS6 rims, drilled/slotted rotors.

                Comment


                • #9
                  Plugged cats?

                  1998 Camaro Z28 - Bright Red, 6.0 TR224, 4l60e, 3.42 Eaton TrueTrac
                  1989 Camaro IROC-Z Convertible - 355 big tube TPI, WC T5, 3.42 Zexel Torsen, CTS-V/C4 brakes
                  1955 Bel Air 2 Door Post - 357 TPI, Muncie M20, 4 wheel disc

                  2006 Saab 9-7x 5.3i Daily Driver

                  Comment


                  • #10
                    He got it figured out. Ended up being a combo of coils, plug wires, and a copper spark plug.
                    -Joel
                    1995 Z28 M6 - AI226/234 - autocross ricer
                    1984 Scottsdale K10 - 305/4bbl/4spd


                    WTB List:Midwest Chasis DS Loop

                    Comment

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