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Thread: Starting issues and limp mode

  1. #1
    MattR1978 Guest

    Starting issues and limp mode

    Hey there, just got a new V8 Disco and am having some issues with starting.


    A few days ago, car was cranking but wouldn’t start – no lights were on. After 3-4 goes it went.


    Next time I tried it, it wouldn’t go at all. A day later it did but after about 10 minutes driving the S and M lights came on and it went into limp mode.


    I then test battery and it was 12.3v… it looked pretty old so I bought a new one, cleaned terminals and was getting 12.8v from both terminals and leads. Car started but after 10 minutes back in limp mode…


    Now when I go to start it the S and M lights come on and it cranks but won’t start.


    From my Googling etc it seems to be that it could be one of a few things:
    • Alternator
    • Crank sensor
    • Grounds
    • Air box and hoses
    • XYZ (but I did the rear wiper test – and that worked, though not sure if this is reliable)


    I know I need to use a code reader but my mate with one is away at moment. Any suggestions on easy ways of solving/ruling out any of these?


    Thanks in advance!

  2. #2
    Join Date
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    what code reader does your mate have(if you can remember).

    You can buy yourself a cheapo($20ish) wireless OBDII transmitter connect via bluetooth to your phone(eg. with Torque app) and it will at least get you some codes to work off.

    OBD readers on this era LR isn't as effective a diagnostic tool, as a nanocom will be, but nanocom is an expensive item.
    It will give you the most accurate troubleshooting info tho, and then a bit more stuff to muck around with on the vehicle too that many OBD tools wont.

    In terms of your issue tho, I reckon it could be a lot more possibilities as to what's causing the problem .. than those you listed.

    CPS(crank sensor) seems to be the most likely culprit with no other info .. started to fail first then just died ... can happen.
    I wouldn't change it based on guesswork tho ... as said, it could be so many other issues .. too much to detail them all.

    as example ... could be failing fuel pump, or iffy(and now dead) relay to it .. or whatever. Can you hear the fuel pump running on IGN posi #2(just before starter)?
    Arthur.

    All these discos are giving me a heart attack!

    '99 D1 300Tdi Auto ( now sold :( )
    '03 D2 Td5 Auto
    '03 D2a Td5 Auto

  3. #3
    MattR1978 Guest
    Quote Originally Posted by AK83 View Post
    what code reader does your mate have(if you can remember).

    You can buy yourself a cheapo($20ish) wireless OBDII transmitter connect via bluetooth to your phone(eg. with Torque app) and it will at least get you some codes to work off.

    OBD readers on this era LR isn't as effective a diagnostic tool, as a nanocom will be, but nanocom is an expensive item.
    It will give you the most accurate troubleshooting info tho, and then a bit more stuff to muck around with on the vehicle too that many OBD tools wont.

    In terms of your issue tho, I reckon it could be a lot more possibilities as to what's causing the problem .. than those you listed.

    CPS(crank sensor) seems to be the most likely culprit with no other info .. started to fail first then just died ... can happen.
    I wouldn't change it based on guesswork tho ... as said, it could be so many other issues .. too much to detail them all.

    as example ... could be failing fuel pump, or iffy(and now dead) relay to it .. or whatever. Can you hear the fuel pump running on IGN posi #2(just before starter)?
    Thanks for response, I just tried with a Vgate OBD and Fusion app on iOS... no codes detected. I think I can hear the fuel pump running, though I am no expert. And yeah, the list is growing... but not in a good way. This may be beyond my meagre skills. Cheers, Matt

  4. #4
    Join Date
    Apr 2016
    Location
    Melbourne
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    Quote Originally Posted by MattR1978 View Post
    Thanks for response, I just tried with a Vgate OBD and Fusion app on iOS... no codes detected. .....
    does the Vgate thingy register the ECU at all? Does it see any info or data?

    I don't know iOS, but if you can get Torque on it, it may show some codes(mine did on Android) .. even the free version does. Free is limited a fair bit vs paid, but at least you may see any thrown codes and clear them if they are nothing.
    Arthur.

    All these discos are giving me a heart attack!

    '99 D1 300Tdi Auto ( now sold :( )
    '03 D2 Td5 Auto
    '03 D2a Td5 Auto

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