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Thread: idle speed

  1. #1
    Join Date
    Feb 2013
    Location
    Ballarat,Vic,Aus
    Posts
    3,044

    idle speed

    Hi Guys,

    the idle speed is stepper motor driven on a '92 model...... Does anyone know why the car will suddenly decide about 450rpm is a perfectly fine idle speed .... I'd prefer about 800rpm myself! The stepper motor is working fine (it'll cycle on the stepper before it settles down if it almost stalls).

    seeya,
    Shane L.
    Proper cars--
    '92 Range Rover 3.9V8 ... slugomatic
    '92 Range Rover 3.8V8 ... 5spd manual
    '85 Series II CX2500 GTi Turbo I :burnrubber:
    '63 ID19 x 2 :wheelchair:
    '72 DS21 ie 5spd pallas
    Modern Junk:
    '07 Poogoe 407 HDi 6spd manual :zzz:

  2. #2
    Join Date
    Jan 1970
    Location
    Avoca Beach
    Posts
    12,735
    Well your kerb idle should be set at about 550 anyway.
    It sounds like the stepper is sticking shut.
    Have you cleaned around the throttle body and blade?
    you also should clean the stepper seat and cone on the shaft. You should not pull on the shaft to try to clean inside.
    Aworking stepper should hold revs up to 1100 as you stop then drop to 650 or so.

    Have you considered that it could be a cylinder dropping out?

    regards PhilipA

  3. #3
    Join Date
    Dec 2008
    Location
    Geelong
    Posts
    511
    Mine was similarly idling slow until recently (91 so same as yours probably). Two main things I did after cleaning the stepper motor pin and seat was check for vacuum leaks - found the fat line running to the stepper motor looked fine but upon taking it off was a bit cracked underneath. The other major difference made was cleaning the oil breather line at the T, where it reduces and goes to the plenum - the brass insert was totally blocked, and the same breather line where the end goes into the earlier part of the plenum before the throttle butterfly - the latter the hose was open, but the internal tube in the housing was totally choked up with carbon. Since then the idle has been really strong and stable. The crankcase really needs to breathe.

  4. #4
    Join Date
    Feb 2013
    Location
    Ballarat,Vic,Aus
    Posts
    3,044
    Thanks Guys,

    well that sounds simple enough (I was concerned it was just an adjustment somewhere0 .... but this sounds a lot simpler

    seeya
    Shane L.
    Proper cars--
    '92 Range Rover 3.9V8 ... slugomatic
    '92 Range Rover 3.8V8 ... 5spd manual
    '85 Series II CX2500 GTi Turbo I :burnrubber:
    '63 ID19 x 2 :wheelchair:
    '72 DS21 ie 5spd pallas
    Modern Junk:
    '07 Poogoe 407 HDi 6spd manual :zzz:

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