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Thread: Can a diesel mis-fire?

  1. #1
    Regular Member v6diesel's Avatar
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    Default Can a diesel mis-fire?

    I have only had my car a few days now, and it runs really well but It has started to show a strange problem..

    On tickover from cold the car mis-fires, once warm it runs smoothly and will return to a normal tickover. But after 5 seconds or so the car starts to mis-fire again. I have also had the spanner light come on twice and the car goes into limp mode. I have the car booked in for a 10K service next week but is there anything I can look for in the meantime, or have any of you had a similar issue?

    Thanks in advance.

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    Regular Member gtr1000's Avatar
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    Had many diesels in the past but not now.

    Air in the system somewhere?

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    Regular Member v6diesel's Avatar
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    Quote Originally Posted by gtr1000 View Post
    Had many diesels in the past but not now.

    Air in the system somewhere?
    I guess this will show up in the service next week then...

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    Regular Member Gsi3.2's Avatar
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    the simple answer is that yes they can, now the injectors are electronically controlled they can fire late or early..

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    Regular Member Gr4eme's Avatar
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    Quote Originally Posted by Gsi3.2 View Post
    the simple answer is that yes they can, now the injectors are electronically controlled they can fire late or early..


    Or in some cases not at all, lol.

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    Regular Member Gsi3.2's Avatar
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    yeah, we sold that car back to VX....

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    Regular Member Ste's Avatar
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    Certainly diesels can mis fire.

    Check security of all fuel pipes, especially high pressure side, check security of injector wires and connectors. Loss of compression when cold ????

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    Regular Member Gsi3.2's Avatar
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    and i think ste will agree with me, that a diesel that is misfiring and suffering excessive 'diesel knock' is undergoing extreme internal stress's..

    if deffo needs looking at soon if you think it is misfiring..

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    Regular Member Ste's Avatar
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    Misfire detection is very important.

    All diesel have extremely high forces acting - par for the course with compression ignition. But one that is sick ain't good.

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    Regular Member shan's Avatar
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    When i had my can on Tech 2 a while ago the guy showed me were to look if i feel it misfiring.
    The electrical connection starts to corrode/blacken with the heat on the injector wiring connection's. And he even said it's very common on these motor's. He said the wiring size is actually to small and if it goes in to VX and they DO the upgrade they replace all the injector wiring.

    (check security of injector wires and connectors)

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