Low Idle w/ Saturn tuned port EFI.

[Jemison Richard]

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.  

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
> >