[Gmecm] Help with unusual BLM's

[Mike V]

I had these symptoms with a bad set of ignition wires.
The big clue is that it happened under load (higher cylinder pressures).
It also occurred more in wet / rainy weather.
It would missfire and the tach needle would drop.
MV

At 11:38 PM 4/3/2006 -0400, you wrote:
>This may not be correct, but the few times I have had a jumping (or
>dropping) tach, it has been an ignition module problem.   Its only been on
>GM V6 motors with DIS, but have done it with both a  3.1 and a 3.8.
>Replacing the module has solved my problem.    Just food for thought...
>
>Scott
>----- Original Message -----
>From: <ahuxtable at sola.com.au>
>To: <gmecm at diy-efi.org>
>Sent: Monday, April 03, 2006 7:01 PM
>Subject: RE: [Gmecm] Help with unusual BLM's
>
>
> > Thanks for the extra info Dustin.
> >
> > The misfire is really intermittent.  Plug gaps were triple checked and
> > the coil has also been replaced.
> >
> > Along with the misfire there is also a violent act of the tacho dropping
> > down.  This leads me more to thing that it could be something like the
> > coil/ignition module losing power (or the ECM altogether).  It's a sort
> > of CBF factor as it's ok most of the time.
> >
> > On a slightly different note however - It seems to be *almost* perfect
> > over the last few days while I've had the 10k resister in the ALDL
> > connector (logging or not).  Maybe it is the ECM after all...Then again,
> > it could be complete coincidence since the weather here has just taken a
> > bit of a cold snap.
> >
> >
> > Ahh, I love cars...
> >
> > Andrew
> >