[s-cars] Things that go bump in the night.

[Robert Rossato]

As I recall, the coils and POSs don't have a feedback for diagnostics,
so there is no code to read with VAG-COM when they fail.  That's why
coil failures are so elusive and POS failures require you to disconnect
individual fuel injectors to isolate which channel has failed.

Bob

> -----Original Message-----
> From: s-car-list-bounces at audifans.com 
> [mailto:s-car-list-bounces at audifans.com] On Behalf Of Robert Myers
> Sent: Saturday, June 17, 2006 8:47 AM
> To: Kent McLean; s-car-list at audifans.com
> Subject: Re: [s-cars] Things that go bump in the night.
> 
> 
> 
> Kent,
> 
> There is no basic difference between the OEM AAN coilpack operation 
> and the 1.8t coil operation.  Constant +12 volt (nominal) is supplied 
> to the primary.  The other end of the primary coil is shorted to 
> ground by the PSO upon the signal from the ECU.  This produces a 
> large current surge in the primary which inductively produces a high 
> voltage spike in the secondary and fires the plug.  The only 
> difference is that the AAN PSO is a three channel device which 
> handles either three or two primary coils at one per channel.  The 
> PSO for the 1.8t coil is built into the coil itself.  The operation 
> is identical only the physical conformation and the locations are 
> different.  There should be absolutely no difference in the ECU/coil 
> interactions between the two types.  VAG-COM should see identically 
> the same information in either case.
> 
> At 08:15 AM 6/17/2006, Kent McLean wrote:
> >Robert Myers wrote:
> > > Monday evening while driving home from Huntington (~110 miles)
> > > the engine ('95.5 S6 AAN-RS2ed w/ 1.8t coil conversion + other
> > > goodies) bucked once.  It felt like the ignition just cut out
> > > very briefly -
> >...
> > > hooked up VAG-COM and read codes - none found.
> >
> >Dumb coil conversion question:  is the coil conversion tied
> >into the ECU codes?  That is, if one of the converted coils
> >goes bad, can the diagnostics detect it the way it would if
> >it was a POS gone bad?
> >
> >--
> >Kent McLean
> >'94 100 S Avant, "Moody"
> >'89 200 TQ, "Bad Puppy" up in smoke
> >_______________________________________________
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> >
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