[Shotimes] More on my issue

[james@dhlake.com]

	I checked it this morning and I get Vbatt on each coil line
with both engine off and running, just for a test I checked AC
voltage while the engine was running, I got a steady voltage on 
2 of the connections of around 2.2 and the third wouldn't steady down
is that a sign of bad drivers?  Is the solution Replace DIS module?
I feel that I am almost to a running SHO again.

On Tue, Jul 01, 2003 at 09:00:31PM -0500, Steve Weinrich wrote:
> Yes, a coil fault can cause a tach that reads 1/3 low.
> 
> The TACH signal (IDM) is a summation of hte three coil drive signals.  If
> there is a fault such that the circuit for one of the coils was open or if
> the output driver in the DIS was defective, you would get this symptom.
> 
> You can check for an open coil/connection by unplugging the DIS connector
> that feeds the coil anf look for Vbatt (Ignition ON) at each of the three
> wires.  This will detect a gross open.
> 
> Steve
> ----- Original Message -----
> From: <james@dhlake.com>
> To: <shotimes@autox.team.net>
> Sent: Tuesday, July 01, 2003 12:46 PM
> Subject: [Shotimes] More on my issue
> 
> 
> > I think my problem has been ignition related all along.
> > I forgot a symptom to add.
> >
> > symptoms:
> > 217 code in persistant
> > tach reads approx 1/3 low
> > cylinders 2 and 6 come up in dropout test
> >
> > All my O2 sensor issues seem to be caused by the ignition
> > dropout.
> >
> > Is there anyway to test the DIS module?
> >
> > Now that the problem is back I will re-check the coil
> > primary side, but could a coil issue cause the tach to drop?
> >
> > Another possible interesting fact, one spark plug blew out
> > of the engine and I limped home on 4 cyl about 1 month before the
> > problem started.  The Ceramic blew out of the metal part, it was odd.
> >
> > James
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