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Thread: Cruise control not working

  1. #1
    Join Date
    May 2007
    Location
    Camden, NSW.
    Posts
    267

    Cruise control not working

    Over the last couple of weeks cruise control has been 'slipping'. I engage it at 105 and slowly it slips to 100 and then after 10 mins to 95km/hr - but today it will not engage. The fuse is fine. Yes i have larger tyres but had large ones for over 2years without a problem. Speedo is out by about 4%.

    Where do I start to diagnose and repair?
    1980 Series3 109 LWB - Hue.
    2012 Defender 90 - Danny.
    2012 Discovery 4 TD6 - Snowman.
    2012 Discovery 4 TD6 - Sandy.... built for comfort - Gone
    1999 V8 4.6lt Discovery SII - Black&Beautiful -Gone .

  2. #2
    Join Date
    Jan 1970
    Location
    Douglas Park, NSW
    Posts
    9,237
    It could just be a vacuum leak from one of the hoses. As the leak gets worse, the pump can't keep up so your speed drops over time.

    Check the hoses at the pump in the engine bay & also at the brake pedal switch first.
    Scott

  3. #3
    Join Date
    May 2008
    Location
    Horsley Park, Sydney
    Posts
    2,934
    Quote Originally Posted by Scouse View Post
    It could just be a vacuum leak from one of the hoses. As the leak gets worse, the pump can't keep up so your speed drops over time.

    Check the hoses at the pump in the engine bay & also at the brake pedal switch first.
    X2

    Erich

  4. #4
    Join Date
    Jan 2008
    Location
    Grange, Adelaide
    Posts
    699
    '99 ES D2 V8 + 2" lift, AMV CDL, LR Roof Rack

  5. #5
    Join Date
    May 2007
    Location
    Camden, NSW.
    Posts
    267
    Prefect thanks! I did a search but obviously did not search deeply enough. Appreciate the patience.
    1980 Series3 109 LWB - Hue.
    2012 Defender 90 - Danny.
    2012 Discovery 4 TD6 - Snowman.
    2012 Discovery 4 TD6 - Sandy.... built for comfort - Gone
    1999 V8 4.6lt Discovery SII - Black&Beautiful -Gone .

  6. #6
    Join Date
    Jun 2008
    Location
    West Midlands, UK
    Posts
    1,717
    Hey guys, sort of related issue:
    A while back now I did that vacuum hose repair (used that link provided by simonl8353), and seemed to be working OK.
    I'm not a big fan of CC so don't use it much. But about a week or so ago I had to come back up the freeway from the dark side (SOR) and thought "not much traffic, I'll stick it on tonight".

    Got to my desired speed, just under 100kph (honest!), and turned CC on. But it wouldn't "hold" on anything above 80kph. Once I'd got it holding on 80, I could increase the speed using the paddles and it would hold fine.

    I needed to touch the brakes, hence auto cancelling the CC. Tried to re-engage CC afterwards and again it drops down to around 80 and I have to "paddle" it back up again.

    Any ideas from anyone as to why this should happen?
    I'm pretty sure the new pipe I put on was the same length and ID as the original, but that shouldn't cause an issue should it?

    Cheers,
    ..:: KIEREN ::..
    2000 Disco II Td5 Auto

    www.facebook.com/AussieAubTd5


    TeamW4 - WEBSITE


  7. #7
    Join Date
    May 2007
    Location
    Camden, NSW.
    Posts
    267
    Brilliant - all done and now for a cruisey drive to Canberra. Thanks for the help.
    1980 Series3 109 LWB - Hue.
    2012 Defender 90 - Danny.
    2012 Discovery 4 TD6 - Snowman.
    2012 Discovery 4 TD6 - Sandy.... built for comfort - Gone
    1999 V8 4.6lt Discovery SII - Black&Beautiful -Gone .

  8. #8
    Join Date
    Mar 2012
    Location
    Sunbury
    Posts
    269

    Failing Cruise Control

    Quote Originally Posted by AussieAub View Post
    Hey guys, sort of related issue:
    A while back now I did that vacuum hose repair (used that link provided by simonl8353), and seemed to be working OK.
    I'm not a big fan of CC so don't use it much. But about a week or so ago I had to come back up the freeway from the dark side (SOR) and thought "not much traffic, I'll stick it on tonight".

    Got to my desired speed, just under 100kph (honest!), and turned CC on. But it wouldn't "hold" on anything above 80kph. Once I'd got it holding on 80, I could increase the speed using the paddles and it would hold fine.

    I needed to touch the brakes, hence auto cancelling the CC. Tried to re-engage CC afterwards and again it drops down to around 80 and I have to "paddle" it back up again.

    Any ideas from anyone as to why this should happen?
    I'm pretty sure the new pipe I put on was the same length and ID as the original, but that shouldn't cause an issue should it?

    Cheers,
    I would be interested to know what the outcome of your problem was. Did you manage to resolve the problem? If so, How?
    I am experiencing a similar problem, which has only become apparent in the past few days.
    Any advice appreciated

  9. #9
    Join Date
    Nov 2012
    Location
    Central Queensland
    Posts
    146
    I also have the same problem. I inspected the hose and it really doesn't seem like it needs replacing.

  10. #10
    Join Date
    Mar 2012
    Location
    Sunbury
    Posts
    269

    Smile

    I have resolved my Cruise Control problems.
    I removed the assembly and found that the vacuum pump, although motor running was functional no vacuum created.
    Replaced assembly, adjusted CC cable. Hooray, all OK

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