Low Idle w/ Saturn tuned port EFI.

[Shannen Durphey]

Jemison Richard wrote:
> 
> Shannen,
> 
> Thanks so much for the info.  I went out and ordered the demo.  Also looked
> for my car.  I can't really tell if they carry a personal edition CD for a
> '92 Saturn or not.  Also ran query for nearest shop which uses the CDs.  I
> had no idea this kind of stuff was out here!
> 
> Someone suggested going through the base idle adjustment procedures in my
> manual.  My manual doesn't even mention such a thing.  I need another
> manual, ha!  If anyone has any suggestions on this I'd appreciate your
> thoughts.
> 
> Also where does one go to buy one of these scanners you mentioned?  And what
> options should I be looking for.  I'm interested in building a efi system
> for my 1100cc motorcycle (4 stroke/4cyl inline).  I also have to work on
> this car - at least long enough to get the idle set.
> 
Snap-on sells through independent tool dealers.  Watch for thier
trucks around local garages. http://www.snapon.com/

Tech 1 is made by Vetronix.  http://www.vetronix.com/main.html

Not for the average hobbyist, though.

I came up with several web pages dedicated to scantools.  Ya might
want to search the web.
Shannen
> Thanks again!
> 
> Rick
> 
> > -----Original Message-----
> > From: Shannen Durphey [SMTP:shannen at mcn.net]
> > Sent: Tuesday, October 27, 1998 10:26 AM
> > To:   diy_efi at efi332.eng.ohio-state.edu
> > Subject:      Re: Low Idle w/ Saturn tuned port EFI.
> >
> > I don't know what year/model/engine you have, but I noticed that there
> > is a TSB whose title fits your symptoms.  Try here:
> > http://www.alldata.com/pro/TSB/
> > If you find a title you want, you might try looking through the same
> > site for a garage in your area which has Alldata, they can look up the
> > service bulletin.
> >
> > And definitely do as David suggests, check the IAC passages and
> > throttle body for carbon buildup.
> >
> > I've used a tech 1 on Saturn, and I'd guess that a snap-on scanner
> > would work.  Both spendy units.
> >
> > Shannen
> >
> > Jemison Richard wrote:
> > >
> > > Shannon,
> > >
> > > Thanks for the input and no I don't have access to a scan tool at this
> > time
> > > (I have no idea which one would even connect up to a Saturn ECU).
> > >
> > > The adjustment I speak of the initial adjustment on the plunger.  The
> > > instructions that came with the unit specifically stated that the
> > plunger
> > > being extended > 1" (could have been 1.1 - whatever)  could damage the
> > unit
> > > and stated to check this value and adjust as necessary.  I was right on
> > the
> > > limit as it came out of the box and so did not adjust the unit at all.
> > >
> > > I've always heard that the IAC "kicks" the idle up to compensate for
> > varying
> > > conditions (temp, accessories, etc).  What I saw was with no IAC control
> > the
> > > idle was about 2500.  With the IAC it dropped to like 500 rpm (and yes
> > this
> > > is a problem as I cannot run my air or the car will die and the car
> > barely
> > > runs at the current idle).  So, I reasoned that the IAC was actually (in
> > a
> > > controlling manner) adjusting the idle as necessary from some initial
> > high
> > > value (in this case 2500 rpm).  So, if the IAC is adjustable (and I
> > don't
> > > know the limits to this adjustment) it might be possible to retract the
> > > plunger (and I'm assuming here) increasing the idle rpm.
> > >
> > > Got a response (you can probably see it) from David Cooley in which he
> > > states there is a base idle procedure.  It may be that I simply haven't
> > > "set" the idle correctly.  So I'm gonna go back through my book and
> > check
> > > this out.
> > >
> > > Do you have any idea what kinds of scan tools would work with a Saturn?
> > > Thanks.
> > >
> > > Rick
> > >