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Thread: Starting problems v8

  1. #1
    garciaj Guest

    Starting problems v8

    Having trouble starting my disco, 1991 3.5 v8 manual.
    It seems to want to start but them stops straight away, you can try and start it several times then it will fire and run fine.
    Could this be the fuel pump, is there any sensors that connect to the fuel pump that could be stopping the pump.

  2. #2
    Join Date
    Jan 1970
    Location
    Oz
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    I'm not sure about the sensors, but in mine you can hear the pump running. As soon the pump stops it starts easily, but if I am in a hurry and don't wait for it to stop it takes a "few" turns of the motor until it pumps up enough.

    Andrew

  3. #3
    Join Date
    Jan 1970
    Location
    Avoca Beach
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    14,152
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    Could be
    1 faulty/old non return valve in pump allowing fuel to drain back. Go to speciilaist to test fuel pressure drop with gauge.
    2 faulty non return valve in fuel pressure regulator ditto. and ditto
    3 faulty fuel pump relay. Does it buzz and click fror 10 seconds when you turn the ignition on?
    4 worn out injectors dropping fuel out of rail. remove for ultrasonic clean and check
    5 old faulty MAF sensor . specialist to test
    6 old faulty TPS . You can test with multimeter
    Any number of other things
    I suggest that you get a manual and do a diagnostic on the injection as per the manual. A 3.9 Range Rover is the same.
    Regards Philip A

  4. #4
    Rovernaut Guest
    Also check your plugs for fouling and check the the timing is not out.

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