[Gmecm] Help with unusual BLM's

[Randy & Gene]

     Ours was over the motor, behind the power steering and alternator..heck
of a thing to get off....the foil covering the ground wire and two signal
wires was corroded in several locations. Like I said before , the tach was
all over the place...sure is nice to have fixed it ourselves......after
dropping about $2000 Cdn to garages...it's nice to know GM fixed it...Gene

----- Original Message ----- 
From: "Dustin Lof" <bubblesjrtwo at yahoo.com>
To: <gmecm at diy-efi.org>
Sent: Thursday, April 06, 2006 10:35 PM
Subject: Re: [Gmecm] Help with unusual BLM's


Gene, did the crank sensor harness go over the motor,
or under the motor?  Gm has released an updated
harness for the 2.8 and 3.1 liter engines that gets
routed under the motor to avoid electrical
interference from the alternator and the plug wires
leading to the rear bank.  I am not sure what year,
but they finally routed it that way on assembly.

Dustin Lof

--- Randy & Gene <gene.mcdonald at sympatico.ca> wrote:

>    On my 93 Pontiac Sunbird with a 3.1 V6 I found a
> badly shielded cable
> between the  crank sensor and the electronic
> ignition module,, tac was all
> over the place. It's shielded with foil like on a
> cigarette package that
> breaks down over time. It took a few hours to remove
> but after being wrapped
> with tin foil it works like new and no more tac
> swing and rough engine. RFI
> gets into the ECU and interfers with other signals.
> Good Luck...Gene
>
> ----- Original Message ----- 
> From: "Mike V" <efi at dyakron.com>
> To: <gmecm at diy-efi.org>
> Sent: Tuesday, April 04, 2006 9:29 AM
> Subject: Re: [Gmecm] Help with unusual BLM's
>
>
> 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
> > >
>
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