[Gmecm] Help with unusual BLM's

[mark krawczuk]

testing...

mark k


----- Original Message ----- 
From: "Dustin Lof" <bubblesjrtwo at yahoo.com>
To: <gmecm at diy-efi.org>
Sent: Friday, April 07, 2006 12:05 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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> > 
> 
> 
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