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Thread: bad idle 3.9 classic

  1. 31st October 2009, 11:16 AM #1
    adrian edge Guest

    bad idle 3.9 classic

    I am having an idle problem with my 3.9 classic at idle it seems to pulse every so often not a constant problem just wondering if this is a fault or just a rover trate.

    cheers edgy
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  2. 31st October 2009, 11:31 AM #2
    raglan_jack Guest
    Hey mate - i had a similar thing on my 97 3.9 and after changing everything i could myself to try get it to idle i went and got it hooked up to a diagnostics and found it was the air flow meter / air mass meter
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  3. 31st October 2009, 03:25 PM #3
    bee utey's Avatar
    bee utey
    bee utey is offline AT REST
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    Could also be the IAC (idle air control) motor, screws in the back of the manifold. Try unscrewing it and cleaning it with carby cleaner.
    Sometimes all you need to do is raise the base idle speed, 3/16 inch allen key on top of the throttle body, open (anticlockwise) with a hot engine until varying speed stabilises.
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  4. 1st November 2009, 08:47 AM #4
    camel_landy's Avatar
    camel_landy
    camel_landy is offline YarnMaster
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    It could be lots of things... So probably best trying to diagnose instead of throwing money at randomly replacing parts!

    The bad idles I've had in the past have been down to either HT leads or head gasket!

    M
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  5. 9th November 2009, 09:38 PM #5
    LOVEMYRANGIE's Avatar
    LOVEMYRANGIE
    LOVEMYRANGIE is offline YarnMaster
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    Try this first. You can do checks to find any problems with the MAF and TPS with the info in the pdf in the linked post below.
    Dont throw any coin at it until you have done this!

    http://www.aulro.com/afvb/1092934-post12.html

    Cheers

    Andrew.
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  6. 9th November 2009, 09:50 PM #6
    roverspec
    roverspec is offline Master
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    do a simple test first .

    Take off the platic T piece in the breather lines off the plenum chamber. In the t piece the is a tiny hole that gets carbined up, give that a good hit with carby clean and try to blow through it.

    This is a piece that gets forgoten but can muck with the idle.

    Try it an see.

    carla
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