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Thread: Disco V8 will not idle

  1. 13th January 2012, 09:08 AM #1
    DiscoDuck94 Guest

    Disco V8 will not idle

    Hi to all. have a problem with 3.9V8 not settling to back to idle, motor stops.

    Sometimes the tacho goes down to zero, motor virtually stopped, then springs back to life at a very low hovering idle.

    Mostly though, when pulling up to the lights the motor drops past it's idle setting and completely stops. No problem with restarting, turn the key and it starts, but NO idle.

    The problem does not exist on the first start up of the day.

    Any ideas on where to start looking.

    Sam
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  2. 13th January 2012, 09:24 AM #2
    BigJon's Avatar
    BigJon
    BigJon is offline ForumSage
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    Clean the throttle body and Idle Air Control Valve (IAC) with carby cleaner or similar.

    If you don't know where to look go and see Ant at Coffs Harbour 4x4 and he will point you in the right direction.
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  3. 13th January 2012, 09:25 AM #3
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    SPROVER
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    Do a search on here there is plenty of info about this problem.The first thing i would do is clean your stepper motor on the back of the plennum.Only takes a few minutes to do.Thats probably your main problem.
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  4. 13th January 2012, 10:08 PM #4
    DiscoDuck94 Guest
    Quote Originally Posted by BigJon View Post
    Clean the throttle body and Idle Air Control Valve (IAC) with carby cleaner or similar.

    If you don't know where to look go and see Ant at Coffs Harbour 4x4 and he will point you in the right direction.
    Thanks, I found Ant and he is going to check it out for me .
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  5. 17th January 2012, 06:04 PM #5
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    Apocalypsse
    Apocalypsse is offline Fossicker
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    I have the exact same problem with my V8 Disco. My mechanic reckons its the air flow meter not working properly. So it either pumps in too much fuel or not enough.
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  6. 18th January 2012, 08:09 AM #6
    chazza
    chazza is offline YarnMaster
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    Quote Originally Posted by Apocalypsse View Post
    I have the exact same problem with my V8 Disco. My mechanic reckons its the air flow meter not working properly. So it either pumps in too much fuel or not enough.
    Unlikely.

    Clean the stepper motor; put some Loctite 515 inside every hose that connects to the plenum chamber; make sure that the plenum and ram air housing are sealed on their joints; and if none of that works test the airflow meter,

    Cheers Charlie
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  7. 18th January 2012, 06:23 PM #7
    DiscoDevil
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    There is a PDF about setting your maf and tps sensor voltages. I set mine accordingly and voila, it's now a dream ride. Cheap and easy.
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  8. 19th January 2012, 12:34 AM #8
    mike 90 RR Guest
    Quote Originally Posted by Apocalypsse View Post
    My mechanic reckons its the air flow meter not working properly.
    Ask him if he is prepared to refund you if it does not work .....


    ......... Just as the others are saying ............
    Check for intake vacuum leaks
    Clean all Air vent lines / Flame trap (breather) MAF / Stepper / Throttle body
    Check and clean all Stepper / TPS / MAF wire connections
    Check base idle
    Check TPS voltage (+ voltage stability when opening throttle)
    Check MAF voltage

    Cheers
    Mike
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  9. 28th January 2012, 06:48 AM #9
    Potty Guest
    Have had the same problem,spent over $900 on new stepper motor,air flow .Ecu Tune ups etc with supposed specialist garage.Took it to Dave at Rovertech in Brisbane ,he had it fixed same day ,turned out to be TPS.Now idles a dream .
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  10. 10th December 2012, 07:59 PM #10
    sheerluck Guest
    Quote Originally Posted by mike 90 RR View Post
    Ask him if he is prepared to refund you if it does not work .....


    ......... Just as the others are saying ............
    Check for intake vacuum leaks
    Clean all Air vent lines / Flame trap (breather) MAF / Stepper / Throttle body
    Check and clean all Stepper / TPS / MAF wire connections
    Check base idle
    Check TPS voltage (+ voltage stability when opening throttle)
    Check MAF voltage

    Cheers
    Mike
    This post should be made a sticky - I've just spent the afternoon trying to trace a rough idle/cutting out after replacing the injectors and seals and used this post as a checklist to hunt though. Got as far as 3. and now it idles and runs beautifully.

    Thanks again to Mike and the combined brains trust.
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