[s-cars] //S4cylinder (#4 cylinder misfire)

[Mark Strangways]

Humm, that makes sense... but it's enough to trigger a timing light .
I would never have thought that.

I must try that sometime.

Mark S
  ----- Original Message ----- 
  From: Robert Myers 
  To: Mark Strangways ; Paul Gailus ; AUDIJIM at aol.com ; Audi5TurboTech at yahoogroups.com ; s-car-list at audifans.com 
  Sent: Saturday, January 21, 2006 7:41 PM
  Subject: Re: [s-cars] //S4cylinder (#4 cylinder misfire)



  The "output voltage of the POS" is zero volts.  It shorts the twelve volts of the primary coil to ground when it is fired by the ECU.  There is a fairly significant surge of current..

  At 07:31 PM 1/21/2006, Mark Strangways wrote:

    *This message was transferred with a trial version of CommuniGate(tm) Pro*
    Wow, I didn't know that the output of a POS was of higher enough voltage to trigger a timing light.
    What is the output voltage of the POS ? Anyone know ?

    Mark
    ----- Original Message ----- From: "Paul Gailus" <gailus at mindspring.com>
    To: "Mark Strangways" <Strangconst at rogers.com>; <AUDIJIM at aol.com>; <Audi5TurboTech at yahoogroups.com>; <s-car-list at audifans.com>
    Sent: Saturday, January 21, 2006 5:47 PM
    Subject: Re: [s-cars] //S4cylinder (#4 cylinder misfire)



      I agree that a 'scope would be best for diagnosing the problem.
      If you don't have one, but you've got an inductively
      triggered timing light, then you could use it to check that
      you're getting a drive signal from the POS output to coil #4
      when the miss is occurring.

      I just checked this out on my S4, and it triggers fine when
      the transformer probe is clipped around any one of the POS
      output wires.
      I didn't expect it to have a triggering problem, since the
      coil primary current is somewhere around 50-100 times
      the level of current at the coil output that's normally
      monitored with these inductive probes :-)

      Paul
      93 S4
      95 S6

      ----- Original Message -----
      From: Mark Strangways <Strangconst at rogers.com>
      To: <AUDIJIM at aol.com>; <douglas.fifield at gmail.com>;
      <Audi5TurboTech at yahoogroups.com>; <s-car-list at audifans.com>
      Sent: Saturday, January 21, 2006 9:41 AM
      Subject: Re: [s-cars] file://S4cylinder (#4 cylinder misfire)



        Is it not possible to check the power to the coil and from the pos, and at
        the ecu and then at the coil while the engine is running ?
        For that matter, if this is a regular problem, you should find overly high
        resistance in the #4 cylinder wiring from ecu thru POS to the coil. What I
        mean is the resistance of the wire only, i.e. between the ecu pin and the
        POS pin for example.

        Sounds like a truly hard to fix problem, but I suspect your determined
        enough to find it.
        If you have a scope.. but I suspect you don't.

        Mark
        ----- Original Message -----
        From: <AUDIJIM at aol.com>
        To: <douglas.fifield at gmail.com>; <Audi5TurboTech at yahoogroups.com>;
        <s-car-list at audifans.com>
        Sent: Saturday, January 21, 2006 10:29 AM
        Subject: Re: [s-cars] file://S4cylinder (#4 cylinder misfire)


        > Doug,
        >
        > I have 6 POS's to choose from. Two brand new ones and two from the car,
        > and
        > two from my spare AAN. I have checked and swapped and retried POS's and
        > also
        > made sure the pins in the connectors were OK, and they were.
        >
        > Jim
        > _______________________________________________
        > S-CAR-List mailing list
        > S-CAR-List at audifans.com
        > http://www.audifans.com/mailman/listinfo/s-car-list
        >

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  Bob
  http://chips-ur-s.com