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

[Robert Myers]

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
>>> >
>>>
>>>_______________________________________________
>>>S-CAR-List mailing list
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>>
>
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Bob
http://chips-ur-s.com