Announcement

Collapse
No announcement yet.

Engine maintains high RPM till stopped.

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • Engine maintains high RPM till stopped.

    Hi Folks

    For a 78 280, has anyone had this situation where the engines runs at 2200 rpm when coasting to a stop. Once stopped, the engine idle drops down to normal. If you have, how did you correct it?

    Thanks, Les
    Last edited by druiven280z; 07-06-2012, 08:55 PM.

  • #2
    Has it always done this ?
    What is normal rpm to you?
    Is it a US car?

    Comment


    • #3
      Originally posted by Ont240 View Post
      Has it always done this ?
      What is normal rpm to you?
      Is it a US car?
      Hi

      On the throttle body is a device called the BCDD. This device prevents the engine speed from dropping too quickly when shifting. In my case, the BCDD was set to far forward so it was maintaining engine speed till the vehicle stopped. By adjusting the screw on the bottom of the BCDD, you can adjust how long the engine speed is maintained. I have now adjusted the BCDD to hold the speed for a split second so that shifting between gears is smooth.

      Cheers

      Comment


      • #4
        I have exact same problem.
        I drove the car 1/2 the year with noooo problems. Man, I only looked at the BCCD the wrong way and I started having issues since then - Haha.
        Do your rpm's hang intermittently or all the time?

        Do you think its necessary to remove and clean this part internally?

        Comment


        • #5
          Originally posted by cronoz78 View Post
          Do you think its necessary to remove and clean this part internally?
          Yes. A great winter project. Might as well look at the afm and throttle body too! Carefully clean clean clean. (Personally I would also port match them for reasembly, but I kinda get over the top sometimes...smooth airflow is key)
          Zen is finding a bolt on your Z that is not rusted solid
          1981 280ZXT
          VG30ET Powered 280Z sold and missed
          Sixteen other various Z's
          Ontario Z Car Member #002

          Comment


          • #6
            check tps, cold start, throttle body, any tubes etc disconnected

            I am doing this on my entire intake air fuel system this winter. it is all in good shape but a good cleaning, recalibrating, and some fresh polish paint does wonders. I kinda need to do this anyways since I am rebuilding the entire exhaust/intake on the car.

            Comment


            • #7
              AFM, TPS, Cold Start, hoses are all good. The BCCD I never touched yet but now I have a winter project!

              I would love to take the throttle body off and clean the gunk out of there! Though, Im considering the Fujitsubo exhaust which requires headers so I dont want to do all this intake work 2x. Also, I am worried about breaking exhaust studs and considering Whitehead doing this.

              Comment


              • #8
                Originally posted by druiven280z View Post
                Hi Folks

                For a 78 280, has anyone had this situation where the engines runs at 2200 rpm when coasting to a stop. Once stopped, the engine idle drops down to normal. If you have, how did you correct it?

                Thanks, Les
                That happened to me on the test drive. I must have huge feet or the pedals in the Z's are closer than I'm used to because it turned out that as I placed my foot on the brake I would also press the accelerator at the same time. At first I thought it was the Toyota unintended acceleration issue, but I quickly realized that I'm just a moron. It still happens once in a while. I doubt that's your issue, but try smaller shoes, just in case
                2018 370Z Sport Coupe...RED! Her name is Zelda
                Sold, but never forgotten...she was my 1st!: 1990 300ZX Twin Turbo...RED! Its name is Aria (Ita.)
                Fireworks Guru www.supernovapyro.ca
                Retired at age 37 www.thebakersson.ca
                Too much spare time on my hands!

                Comment

                Working...
                X