Re: Cam Position Sensor

["Shawn R. Lin" <slin01@mail.orion.org>]

TK wrote:
> 
> Yep, I'm in California. We get the better stuff here. 8^)
> 
> I grabbed a cam sensor from a 3100 SFI and I recall pulling it from the
> front of the intake or block just behind the pulley's. I don't have a  3.1L
> MPFI here but it just sticks in my head that *when* it's there, it was in
> place of the dummy oil drive in the dist hole.
> 
> Anyone that can clarify this?

I just double checked my parts catalogs.
Looks like in W-body apps, the 93 3.1L with NB2 (Cali Emissions)
definitely had a special block with the cam sensor hole in the same
place as the 3100.  The 93 3.1L w/NB2 also uses the same cam sensor as
the 94+ 3100, and just to make absolutely sure, I also checked the part
# of the oil pump drive (distributor dummy plug).  It is the same p/n as
the 88-93 2.8/3.1L, so at least on W-body apps, there's no sensor there.

This special one-year-only Gen II 3.1L LH0 w/SFI was used in all W-body
cars: Lumina, Cutlass Supreme, Grand Prix, and Regal, but only in '93
and only in California.  Another interesting thing to note is this
engine also used a P6 flash PCM just like the one used on the 3100 - of
course also only in California.  Fed emissions cars got a P4 PCM.

Shawn

> ----- Original Message -----
> From: Shawn R. Lin <slin01@mail.orion.org>
> To: <gmecm@diy-efi.org>
> Sent: Friday, September 01, 2000 12:02 PM
> Subject: Re: Cam Position Sensor
> 
> > TK wrote:
> > >
> > > Well, it could be too much Sterno on my side, but I thought the 3.1L
> MPFI's
> > > had them in the dist hole and 3100 SFI's had them up front.
> >
> > According to my parts catalogs, there was only ONE 3.1L (Gen II) that
> > had SFI and a cam sensor, that was the '93 3.1L with California
> > emissions used in the Pontiac Grand Prix, possibly others.  Fed
> > emissions for that year didn't get the cam sensor as they were still
> > MPFI.  The parts catalog says that particular engine, though, had a
> > special block with cam sensor hole.  The cam sensor was also the same
> > p/n as the 94+ 3100 SFI (Gen III).
> > I only have parts catalogs for W-body cars though, and the 3.1/3100 was
> > used in other body types so there may have been a special cam sensor
> > designed to replace the distributor plug on some other body type.
> >
> > Shawn
> >
> > > ----- Original Message -----
> > > From: Shawn R. Lin <slin01@mail.orion.org>
> > > To: <gmecm@diy-efi.org>
> > > Sent: Friday, September 01, 2000 11:16 AM
> > > Subject: Re: Cam Position Sensor
> > >
> > > > TK wrote:
> > > > >
> > > > > It's where the distributor was.....
> > > > >
> > > > > Drops into the same hole.
> > > >
> > > > That's what I thought at first since that's what the illustrations in
> > > > the GM parts catalog seems to imply, but that's not the case according
> > > > to the Helms.
> > > >
> > > > Shawn
> > > >
> > > > > ----- Original Message -----
> > > > > From: Shawn R. Lin <slin01@mail.orion.org>
> > > > > To: <gmecm@diy-efi.org>
> > > > > Sent: Thursday, August 31, 2000 10:51 PM
> > > > > Subject: Re: Cam Position Sensor
> > > > >
> > > > > > Bruce Plecan wrote:
> > > > > > >
> > > > > > > Any one have any URLs, Pics etc, of the timing cover on a 1994
> 3.1
> > > /
> > > > > 3.4
> > > > > > > chevy motor.
> > > > > >
> > > > > > You might try http://members.aol.com/gpxss
> > > > > > In his Pictures section, he has a lot of pictures of a 3100 V6
> > > teardown.
> > > > > > The cam position sensor is not in the timing cover though, it's in
> the
> > > > > > block behind the timing cover.



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