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Thread: Skips a beat

  1. #1
    johnv Guest

    Skips a beat

    Hi all

    Disco II TD5

    My disco suddenly and intermitently misses a beat.

    No probs to indecate before and and no issues afterwards either.

    Its only for a fraction of a second.

    It only happens occasionaly.

    Seems to me like a possible fuel issue?

    Any ideas

  2. #2
    Join Date
    Jul 2003
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    Sydney's gritty inner west (2204) and verdant Mount Wilson
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    Hi Johnv

    What model year and how many km on the clock?
    Mahn England

    DEFENDER 110 D300 SE '23 (the S M E G)

    Ex DEFENDER 110 wagon '08 (the Kelvinator)
    http://www.aulro.com/afvb/members-rides/105691-one_iotas-110-inch-kelvinator.html

    Ex 300Tdi Disco:



  3. #3
    Join Date
    Jan 1970
    Location
    Brisbane, Queensland (Australia)
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    Mine is a 2001 Td5 auto. I have noticed the same thing from time to time. Does not seem to do anything apart from a slight miss as you mention.

    On 2 occasions I have had trouble starting the engine. Once at Tennant Creek mid day in April and one on the Gold Coast. Both times were after running for an hour or so and then stopping for less than half an hour. The engine cranked over but would not fire. Both times I turned igintion on and pumped the pedal 5 times - my mechanic told this would self bleed to fuel line if air was in it. Both times it finally fired after 2 or 3 goes at this.

    Mentioned this to my mechanic on the last service and he could find nothing wrong.

    I thought the miss might be related to the starting problem, but I don't know.

  4. #4
    Join Date
    Jan 1970
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    Adelaide Hills. South Australia
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    <div class='quotetop'>QUOTE</div><div class='quotemain'>My disco suddenly and intermitently misses a beat. [/b][/quote]

    Maybe it happens at the same time that the Bank withdraws your monthly installment. :roll: :wink:

  5. #5
    Join Date
    Jan 1970
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    Brisbane, Queensland (Australia)
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    Hey that might be the problem ...... hang on :?: ....... I paid cash for it! 8O

    Can't be that ..... maybe it just likes to tease me a bit ... or my mechanic has fiddled with the computer and pushes the remote when he is a bit short of cash for the week! ops:

  6. #6
    Join Date
    Jan 1970
    Location
    St Helena,Melbourne
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    Pumping the acc. pedal on an efi or crd vehicle before cranking will do nothing.

  7. #7
    johnv Guest
    1999 TD5 160K on clock

  8. #8
    Join Date
    Jan 1970
    Location
    Brisbane, Queensland (Australia)
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    Well it worked for me. My mechanic used this method at the Land Rover dealership he used to work at. When he started working for his new employer the employer told me it used to take the other mechanics up to half an hour to bleed the system after a filter change in a Td5. Anyway I have read that the Td5 fuel system pressurises the fuel from the pump in the tank. This happens when the ignition is turned on and the fuel system starts to pressurise.

    I might be wrong, let me know if I am and also what could cause the engine not to fire.

  9. #9
    Join Date
    Jan 1970
    Location
    Brisbane, Queensland (Australia)
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    This is from the RAVE CD:

    Fuel system purging
    ____________
    If the vehicle runs out of fuel, or the fuel level is so
    low that the fuel system draws air into the fuel rail,
    the fuel rail will need to be purged before the engine
    will start. This can be achieved by following the
    procedure below.

    If this procedure is carried out on a vehicle that
    has not run out of fuel or otherwise drawn air into
    the fuel rail, it can lead to the engine flooding and
    failing to start.

    Purge

    1. Turn the ignition switch off and wait 15
    seconds.

    2. Turn the ignition switch to position II and wait 3
    minutes (this ensures that the fuel system
    purges all the air from the fuel rail within the
    cylinder head).

    3. Fully depress the throttle pedal.

    4. Keeping the throttle pedal fully depressed,
    crank the engine.

    5. As soon as engine speed exceeds 600 rev/min,
    release the throttle pedal and the ignition
    switch.The engine must not be cranked
    continuously for more than 30 seconds at
    any one time.

    6. If the engine fails to start, repeat the above
    procedure.


    I believe this is very similar to what my mechanic told me to do. My main concern was with paragraph 2. Maybe my fuel system had some air in it.

    It only failed to start twice in the 15 months I have owned it.

    Any ideas or similar experiences?

  10. #10
    septimus Guest
    The purging procedure for the TD5 Defender is in the user handbook - isn't that also the case with the Disco?


    Anyway, on to more practical stuff. I don't know if the Disco is the same as the Defender but I suspect so in that the Defender has a relay that powers the fuel pump. I had problems with power loss and not starting. It usually just died and after a couple of minutes started again. Took some time to track it down but it was the fuel pump relay. Seemed it was going open circuit but testing with a multimeter showed nothing as the early models had a resistor in parallel with the coil. Eventually it gave up all together which was proven when I put it on an external power supply and found the contacts did not close

    In the early stages the other symptom was a variation in the sound the fuel pump made which I put down to it pumping harder to purge the air in the system.

    Maybe this could help you track it down. If in doubt you can just stick a new relay in and see if the problem goes away. Never hurts to have a spare anyway...

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