RPMs surge when at steady speed - FirebirdV6.com/CamaroV6.com Message Board

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  • RPMs surge when at steady speed

    Explanation - between 30 and 65mph while keeping the speed and rpms as steady as possible I can see on the TAC that the rpms rise by about 100 or so and I can actually hear it through my flowmaster exhaust. For instance at 40mph and 1400rpm I can see the TAC go up to 1500 then back down again this continues about every few seconds. I had a thread on this earlier but the opinion was that it was just the exhaust. At idle the rpms are steady. Above 70 I don't see this, it starts around back when speed drops to around 65. Neither the SES or check engine light are on. Anything simple I can check?

  • #2
    Re: RPMs surge when at steady speed

    Try Transmission fluid
    Wait, Is that a V6 or V8?
    1990 Chevrolet C-K 1500 series 4.3L .. 5spd
    1994 JDM Euno Roadster 1.8L 5spd Bolt Ons.. etc
    2000 Camaro 3.8L Auto Bolt Ons..etc

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    • #3
      Re: RPMs surge when at steady speed

      Checks good, right at the top of the crosshatch. That was about an hour after I got home from work, I'll check it again tomorrow when I get to work.

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      • #4
        Re: RPMs surge when at steady speed

        Torque converter clutch may be slipping. The faster you drive the higher pressure the trans pump makes, so it slips less.
        sigpic

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        • #5
          Re: RPMs surge when at steady speed

          Hmm, didn't want to hear that. Every time I get my tax refund in something comes up. Guess I need to get it check out.

          Thanks

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          • #6
            Re: RPMs surge when at steady speed (Solved)

            Pretty embarassing actually, my son who also drives a 99 Firebird suggested I change the air filter - that did the trick.

            Thanks to all who replied.

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