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

[Mark Strangways]

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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>
>