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Thread: Crank Angle Sensor

  1. #1
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    Crank Angle Sensor

    1994 Discovery1 V8i Auto.

    Over the last 6months the disco (intermitittently) keeps cutting out whilst driving, it just loses power (after it warms up) and stops but starts up again straight away.

    The last 2 days it has got worse up to 4 times a day, today I took it to 4 auto electricians to get the error codes checked, the first 3 didn't have the proper scanner to do it and the third had one but couldn't find where to plug it into (God help us).

    After describing the problem to them they all pointed the finger at the Crank Angle Sensor, the last one saying that it was located in the distributor as it was an early model and that later ones were attached to the engine some where.

    Have just got home and rang my Landrover guy to see if he had a second hand distributor that had the Crank Angle Sensor in it, he laughed and said that the disco1 didn't have a Crank Angle Sensor because bla bla ect.

    After describing the problem to him he said it sounded like the ignition module to him, said his daughter could drop one off on her way home for me cost $100, I said I would get back to him.

    Now I am completly confused, so does the 1994 disco have a Crank Angle Sensor or is the Landrover guy correct and could the Ignition Module be the problem.

    I would take it to the Landrover guy but am afraid I will end up broken down on the side of the road and be really up the creek without a paddle.

    Would really appreciate some help on this one
    Many thanks
    Rich

    ps: have already put a new petrol pump in to start eliminating suspects.

  2. #2
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    Well both are somewhat correct.

    The 3.9 does not have a crank angle sensor as such, as a crank angle sensor takes the timing directly from the front or rear of the crankshaft to the ECU which fires the coils directly.This is in later models like Disco 2 and RR38A

    The distributor fires the cylinders mechanically, after the ignition pickup send a signal to the ignition module which fires the coil.
    So the ignition module is most probably your problem and the parts bloke had the right part.
    Regards Philip A

  3. #3
    p38arover's Avatar
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    I agree with Philip. The crank angle sensor didn't come along until the P38A and, subsequently, the Disco 2 - neither of which have a distributor.
    Ron B.
    VK2OTC

    2003 L322 Range Rover Vogue 4.4 V8 Auto
    2007 Yamaha XJR1300
    Previous: 1983, 1986 RRC; 1995, 1996 P38A; 1995 Disco1; 1984 V8 County 110; Series IIA



    RIP Bucko - Riding on Forever

  4. #4
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    Quote Originally Posted by PhilipA View Post
    Well both are somewhat correct.

    The 3.9 does not have a crank angle sensor as such, as a crank angle sensor takes the timing directly from the front or rear of the crankshaft to the ECU which fires the coils directly.This is in later models like Disco 2 and RR38A

    The distributor fires the cylinders mechanically, after the ignition pickup send a signal to the ignition module which fires the coil.
    So the ignition module is most probably your problem and the parts bloke had the right part.
    Regards Philip A
    Thanks Phillip, where is the ignition module located and are they hard to DIY fit??.

    Also can you tell me where the plug??? is located that they plug the scanner in for fault codes, so The next time I can show them where it is.

    He had a list of where they are but could'nt find it:

    5pin 14-CUX - Behind trim panel in front of drivers door.
    3pin Electronic EGR - Behind trim panel in front of drivers door.
    3PIN mems mpI - Engine bay next to ECU
    5pin (blue) ABS - Behind trim panel in front of drivers door
    4pin Airbag - Below steering wheel behind trim panel
    16pin - Drivers side of centre console above pedals.

    Which one is it please for the fault codes.

    Again many thanks
    Rich

  5. #5
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    Quote Originally Posted by p38arover View Post
    I agree with Philip. The crank angle sensor didn't come along until the P38A and, subsequently, the Disco 2 - neither of which have a distributor.
    Thank god I didn't pay their wonderfull knowledge

  6. #6
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    Well I installed the new ignition module last night, it was a bit fiddly to do due to it's location.

    The good news is that it started first go, but I decided against a test drive in the dark, so will go for a spin today and am keeping my fingers crossed.

    Regards
    Rich

  7. #7
    sheerluck Guest
    The Lucas ignition module is a well known weak point in the V8 D1. It's a shame that Bee Utey didn't see this thread and point you to his very well documented Bosch conversion.

  8. #8
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    Not good news, went for a test run after about 9km same problem it just loses power and cut out.

    This time when I restarted it, I just sat there and let it idle for about 10min all of a sudden it started idling fast the tacho would go up to around 1400rpm and if I just feathered the throttle the tacho would drop down to under 800rpm, take the foot off the throttle and tacko goes back up to around 1400rpm - if I continued to push the throttle it would just die.

    More thoughts/ideas please as starting to tear the hair out.

    Regards
    Rich

  9. #9
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    Talking

    Quote Originally Posted by sheerluck View Post
    The Lucas ignition module is a well known weak point in the V8 D1. It's a shame that Bee Utey didn't see this thread and point you to his very well documented Bosch conversion.
    Any chance you could put up a link please? I would be interested in this with some of the little niggles I'm having. I have a blue dizzy cap, what's the story with them?
    Thanks

  10. #10
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    Quote Originally Posted by steelo View Post
    Any chance you could put up a link please? I would be interested in this with some of the little niggles I'm having. I have a blue dizzy cap, what's the story with them?
    Thanks
    Lucas ignition amplifier replacement by Bosch 024

    Funny you're talking about blue dissy caps, yesterday a customer handed me one in a box (says Made in Italy) and told me to fit it. It's so loose on the dissy body I wouldn't trust it to not catch the rotor button. So I polished up his original black Lucas cap and put it back on.

    As for the OP the coil lead could have fried, causing excess voltages reverberating around and breaking down the coil and the Lucas amplifier. Also the amount of loose connectors I see around the coils on LR's its a wonder they ever keep running. Carefully squeeze any crimp connector to the coil and make sure they go on with a little force. This makes better metal to metal contact than loose dirty old connectors in crumbling nylon sleeves.

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