1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.
  2. Welcome To LandyZone!

    LandyZone is the biggest Land Rover forum on the net. We have plenty of very knowledgable members so if you have any questions about your Land Rover or just want to connect with other Landy owners, you're in the right place.

    Registering is free and easy just click here, we hope to see you on the forums soon!

Strange cold idling behaviour

Discussion in 'It's A V8 Mate!!' started by jackroadkill, Mar 11, 2009.

< Previous Thread | Next Thread >
  1. jackroadkill

    jackroadkill Member

    Joined:
    Feb 22, 2009
    Posts:
    12
    Likes Received:
    0
    Location:
    Mid Wales
    My Range Rover (3.9 V8), when started from cold, will rev itself to about 2000rpm and then drop back to about 800rpm in the space of a few seconds. This continues until it gets warm, whereupon it stops. It is most noticable in neutral but it also happens if running in gear on tickover which is annoying because it makes for a very jerky ride. Occasionally it will rev (by itself)to a steady 2250rpm when the clutch is depressed, hold there for about ten seconds and then drop back to its' normal idle speed.
    I'm new to Range Rovers and am guessing that this is not an unheard of problem.

    Does anybody know the cure for it? I'm reasonably handy and do the vast majority of work on my cars myself, so hopefully I'll have no trouble doing it.

    Cheers,
    JR
     
    Last edited: Mar 11, 2009
  2. classic kev

    classic kev Well-Known Member

    Joined:
    Jun 23, 2008
    Posts:
    3,461
    Likes Received:
    100
    Location:
    on the side of a hill near Nannerch, N.Wales
    That could be a couple of things (as ever). I think I would start with taking the plenum off and giving it a good clean then re-set the base idle speed. Also make sure the stepper motor (idle air control valve) is working properly and that there are no air leaks in the induction system.

    You might also want to make sure your air filter is clean. I also seem to think that you should check you have a good strong battery and that your alternator is in good shape.

    Hope that goves somewhere to start - good luck.
     
  3. rojbarker

    rojbarker New Member

    Joined:
    Sep 12, 2007
    Posts:
    544
    Likes Received:
    0
    Location:
    Handover, 'Ampshire
    Could be you have a vacuum pipe off or leak somewhere, that could cause weird idle problems like that. Open the bonnet with the engine running and listen for sucking/hissing from around the intake.
     
  4. jackroadkill

    jackroadkill Member

    Joined:
    Feb 22, 2009
    Posts:
    12
    Likes Received:
    0
    Location:
    Mid Wales
    Thanks, fellas - will give it a checking out over the weekend.
     
< Previous Thread | Next Thread >