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Thread: High idling 4AC

  1. #1
    Senior Member squish_m8's Avatar
    Join Date
    Dec 2008
    Name
    Kieran
    State
    SA
    Location
    Adelaide
    Country
    Australia
    Posts
    783

    Default High idling 4AC

    Car - KE70

    motor - 4A-C

    use - daily duties

    problem - 4ac idles at 2000-2300rpm once warm

    occurs/started when - 4ac was dropped in

    personal situation - would like to make the car idle normally and not drain the fuel so quickly


    So yesterday I dropped a 4ac in my daily bus yesterday after losing a cylinder in the last engine. The new engine runs fine, when cold it idles about 1400rpm but once it is warm this climbs to 2000-2300rpm which seems quite excessive to me. I would like to know what could be causing this and how I can make the car idle normally once it is warm.

    Cheers, Kieran

    p.s. Also I have tried playing with the idling screw and timing and this made hardly any difference.

  2. #2
    Member Philbo's Avatar
    Join Date
    Jan 2009
    Name
    Phil
    State
    NT
    Location
    Darwin
    Country
    Australia
    Posts
    57

    Default

    Checked the choke butterfly is open when warm?
    Could be a vacuum leak.. Have you swapped inlet manifolds or carbies and reused the old gaskets?
    All the vacuum lines connected properly? If you spray a bit of carby cleaner on the leaky spot it should make the engine stumble a bit as it sucks in the cleaner.

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