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Bouncing idle while pumping brakes?

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    Bouncing idle while pumping brakes?

    anyone else have this issue? while in N if i pump my brakes fast, my idle bounces between 1700 and 800. i also have bouncy idle just in neutral sometimes as well but its only -+100 RPM's or so. im thinking it might be my TPS. i have not checked it yet nor have i looked for vacuum leaks. my car missfires every 10 seconds or so too at any RPM's. ive cleaned all the valves and tightened the fast idle screw and reset my base idle. any help would be greatly appreciated.
    CB7 93 LX AT.


    MY_CB7

    #2
    Originally posted by hondacord93 View Post
    anyone else have this issue? while in N if i pump my brakes fast, my idle bounces between 1700 and 800. i also have bouncy idle just in neutral sometimes as well but its only -+100 RPM's or so. im thinking it might be my TPS. i have not checked it yet nor have i looked for vacuum leaks. my car missfires every 10 seconds or so too at any RPM's. ive cleaned all the valves and tightened the fast idle screw and reset my base idle. any help would be greatly appreciated.
    Pumping the brake "creates" a vacuum leak which cause's the increase in idle.
    (Vacuum booster) - It's normal.

    As for your other issues - when was the last time you changed the plugs/fuel filter?


    Car Safety / General Servicing Checks --------Basic suspension checks

    My 5.7 LS1 Holden Ute

    A "Finished" project car is never finished until its been sold.

    If at first you don't succeed, Try again. Don't give up too easily, persistance pays off in the end.

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      #3
      oh that makes sence.. fuel filter and plugs have less then 15,000 miles on them.
      CB7 93 LX AT.


      MY_CB7

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