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P38 cold start issues

Discussion in 'Range Rover' started by bionicbob, Jul 5, 2020.

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  1. bionicbob

    bionicbob Member

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    hi all im new to this recently got a p38 after running discos bad move lol
    its a P38 2.5 DSE 1997
    it takes about 4 turns of the key to start in a morning but once running starts every time
    the temp gauge dosnt work as it moves to the bottom of blue when you turn it on and just stays there the cooling system is fine the heater blows hot as the engine warms up as it should also had my snapon scanner on it the ecu temp is not working and fuel temp they show a voltage of 4.9 on the scanner and also at the plugs for the sensors also check there is a earth showing from the plugs i have spent the last 3 days just reading posts on here and no one as posted any answers
    would be greatfull if some one out there had maybe had this problem and fixed it
    cheers Bob
     
  2. bionicbob

    bionicbob Member

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    sorry forgot to add its a auto not that i think it would make a difference
     
  3. Wazzajnr

    Wazzajnr Well-Known Member

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    Glow plugs would probably be the first port of call. I think @wammers says you need 4 good plugs on consecutively firing cylinders for a cold start (correct me if I'm wrong)
     
  4. Datatek

    Datatek Well-Known Member

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    You need to sort the temperature sensor.
    If they are in the right order, they will start on 3 plugs.
    Your Snap on scanner may not work correctly on the P38 as it is not OBD compliant.
     
  5. bionicbob

    bionicbob Member

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    cheers but all heater plugs working fine
     
  6. bionicbob

    bionicbob Member

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    please correct me if im wrong but by bridging the terminals on the plugs then this should make my temp gauge show hot?
     
  7. Datatek

    Datatek Well-Known Member

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    No, the temperature gauge sensor is not the same one as the ECU sensor. The fact that the temperature is staying in the blue is often due to the thermostat being missing or faulty, so you have 2 separate problems with temperature plus maybe a glow plug issue. shorting things out is not a good idea on the P38 unless you really know what you are doing, you could easily end up damaging the BECM.
     
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  8. bionicbob

    bionicbob Member

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    no the temp gauge needle move up when you first turn the ignition on to just below the blue and thats where it stays all the time regardlees of engine temp the engine heats up fine then as it should
     
  9. Datatek

    Datatek Well-Known Member

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    The temp gauge will move to the start of the blue regardless, you say the engine is getting hot but you do not know how hot and it needs to be quite hot before the gauge moves, they are not linear.
    Maybe both temperature sensors are faulty but I think a check to see if a thermostat is fitted would be a good idea.
    With suitable diagnostics the ECU engine temperature sensor and gauge temperature sensor can be read.
     
  10. bionicbob

    bionicbob Member

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    which is the best diagnostics to get as i do have the old britpart lynx
     
  11. Datatek

    Datatek Well-Known Member

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    Nanocom is the only really comprehensive diagnostics for the P38. www.blackbox-solutions.com
     
  12. bionicbob

    bionicbob Member

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    just ordered one
     
  13. Datatek

    Datatek Well-Known Member

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    Wow, that was quick.:D
    It will pay for itself and can be sold on for close to what you paid for it when you no longer need it.
     
  14. bionicbob

    bionicbob Member

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    well if i need one i need one
     
  15. brianp38dse

    brianp38dse Well-Known Member

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    Have a look at the bleed off pipes they may be letting air in which will let the diesel bleed back which will not help starting, are there any air bubbles in the clear pipe from filter to pump,
     
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  16. bionicbob

    bionicbob Member

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    No there isn’t and also got a one way valve fitted
     
  17. brianp38dse

    brianp38dse Well-Known Member

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    Ok rules that out then.
     
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  18. RangeRoller dt

    RangeRoller dt Well-Sprung Member

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    There is a myriad of threads on it.
    you’ll be fine ;)
     
  19. bionicbob

    bionicbob Member

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  20. bionicbob

    bionicbob Member

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    Everyone I have checked no one as posted an answer they all post ideas but no one says what cured there problem
     
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