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Thread: VS commodore hot relays

  1. #1
    Ext User(dale-google@monsya.net) Guest

    VS commodore hot relays

    Hi,

    in the process of trying to find a fault with my VS V6 commodore, I've
    noticed that the Ignition and EFI relays run rather hot. Is this
    normal? I've never taken the time to check them before as usually the
    engine is already hot and with the bonnet shut you would expect
    everything to be warm.

    The car originally stopped running, and wouldn't restart, even when
    cold. I changed the DFI and coils with a spare assembly I had, but
    there was no difference.

    I ran a diagnostic and got a code 46 which suggested that the CAS was
    faulty. I replaced that, but it still wouldn't start. It doesn't set
    that code anymore though.

    Now the car is at the point where it has stopped running a few times,
    but I can't figure out why. I was wondering if somehow the relays
    might be overheating and dropping out.

    Has anyone had this sort of problem? The car is running now and
    starting okay, but I am worried that it is going to stop dead
    somewhere inconvenient and I'm not really looking forward to it.

    Dale.


  2. #2
    Ext User(Michael C) Guest

    Re: VS commodore hot relays

    <dale-google@monsya.net> wrote in message
    news:1179123120.335141.143810@y80g2000hsf.googlegr oups.com...
    > Has anyone had this sort of problem? The car is running now and
    > starting okay, but I am worried that it is going to stop dead
    > somewhere inconvenient and I'm not really looking forward to it.


    Relays will get hot if they have a bad contact. A bad contact causes
    resistance which causes a voltage drop across the relay which causes heat.
    Although I'd be suprised if it was the problem just try swapping a few
    around anyway.
    >
    > Dale.
    >




  3. #3
    Ext User(Clockmeister) Guest

    Re: VS commodore hot relays


    <dale-google@monsya.net> wrote in message
    news:1179123120.335141.143810@y80g2000hsf.googlegr oups.com...
    > Hi,
    >
    > in the process of trying to find a fault with my VS V6 commodore, I've
    > noticed that the Ignition and EFI relays run rather hot. Is this
    > normal? I've never taken the time to check them before as usually the
    > engine is already hot and with the bonnet shut you would expect
    > everything to be warm.
    >
    > The car originally stopped running, and wouldn't restart, even when
    > cold. I changed the DFI and coils with a spare assembly I had, but
    > there was no difference.
    >
    > I ran a diagnostic and got a code 46 which suggested that the CAS was
    > faulty. I replaced that, but it still wouldn't start. It doesn't set
    > that code anymore though.


    You need to determine if you have injector pulse and/or spark.

    Did you perchance swap the fuel pump relay with another one?

    Did you try turning the key slowly when you go to start the car (off to
    crank) and did you cycle the ignition each time (in case of keyreader/key
    fault )?

    > Now the car is at the point where it has stopped running a few times,
    > but I can't figure out why. I was wondering if somehow the relays
    > might be overheating and dropping out.


    Yep, that is possible. Swap the EFI and ignition relay with two others for a
    start.

    > Has anyone had this sort of problem? The car is running now and
    > starting okay, but I am worried that it is going to stop dead
    > somewhere inconvenient and I'm not really looking forward to it.
    >


    Try swapping the relays and check for spark and injector pulse.

    Assuming all fuses and relays are OK you should see a pulse at the injector
    when cranking and you should see a spark when cranking.
    If not, you are looking at a missing CAS signal which is most lilely related
    to the sensor, wiring and ECU - in that order.

    If you have injector pulse but no spark, check DFI, wiring and CAS.

    If you have spark but no injector pulse, check CAS, wiring and ECU.

    If you have both but still no go, check to make sure the fuel pump is
    initialising and you have fuel pressure.



  4. #4
    Ext User(dale-google@monsya.net) Guest

    Re: VS commodore hot relays

    On May 14, 10:51 pm, "Michael C" <nos...@nospam.com> wrote:
    > <dale-goo...@monsya.net> wrote in message
    >
    > news:1179123120.335141.143810@y80g2000hsf.googlegr oups.com...
    >
    > > Has anyone had this sort of problem? The car is running now and
    > > starting okay, but I am worried that it is going to stop dead
    > > somewhere inconvenient and I'm not really looking forward to it.

    >
    > Relays will get hot if they have a bad contact. A bad contact causes
    > resistance which causes a voltage drop across the relay which causes heat.
    > Although I'd be suprised if it was the problem just try swapping a few
    > around anyway.
    >
    >
    >
    >
    >
    > > Dale.- Hide quoted text -

    >
    > - Show quoted text -


    Thanks, I will try that and see if the problem follows the relays or
    the position of the relays.


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