New member with lots of questions... (fwd)

[Tom Barcia]

So, if I understand this, once I get the VSS working my IAC will work
properly.  I would assume that the IAC not resetting could cause the lean
condition that in turn causes the MIL and the poor economy??  That's my
guess anyhow.  

As far as reprogramming, did you say to scrap the idea of flashing the
prom??  PINE screwed up the message formatting and made it tough to read.

Thanks.

Tom Barcia
tbarcia at emanon.net
www.emanon.net/~tbarcia
+----------------------+

On Wed, 27 Oct 1999, Mike Rolica wrote:

> 
> Mike Rolica
> EXT. 260
>  :-)
> 
> 
> 	-----Original Message-----
> 	From:	T. Barcia [SMTP:tbarcia at home.com]
> 	Sent:	Tuesday, October 26, 1999 9:26 PM
> 	To:	gmecm at efi332.eng.ohio-state.edu
> 	Subject:	FW: New member with lots of questions... (fwd)
> 
> 
> 	Hello all.  I'm a new member of this list and decided to subscribe
> after
> 	reading some of the archives and coming up with many questions.  As
> an
> 	introduction, I'm a Network Administrator for a large aerospace
> company
> 	and one of my hobbies involves swapping a 1995 3.4L v6 from a Camaro
> 	including all of the FI goodies into a 1984 GMC Jimmy 4x4.  I'm a
> tinkerer
> 	by nature and love to get my hands on things that I know nothing
> about.
> 	That's basically why I'm here.  I admit to knowing very little about
> fuel
> 	injection systems besides the very basics and knowing nothing of the
> inner
> 	workings of the ECM.  Given the proper ECM and wiring harness I was
> able
> 	to make the 3.4 work in a non-computer equipped truck and consider
> that
> 	one of my best acomplishments with the truck.  
> 
> 	In performing the swap, I managed to overlook several things and
> still
> 	managed to get the whole thing to work.  I do not have the ALDL nor
> do I
> 	have the budget to purchase the OBD-II scanner to read the ECM if I
> had
> 	the connector.  I found this site after finding Dave's LT1 scanner
> on the
> 	web which leads me to one of my biggest questions:  will Dave's
> scanner
> 	work on my 3.4L v6??  If there's any information that you need to
> answer
> 	this question, please let me know.
> 
> 	Regarding the VSS, since the truck uses a mechanical speedo, I will
> need
> 	some way to send the VSS signal to the ECM.  The truck runs
> excellent at
> 	this point without VSS but after reading the archive, it looks as
> tho I
> 	can get much better mileage with the VSS hooked up.  I know that my
> truck
> 	has cruise control (which doesn't work anyway) so I'm wondering if I
> can
> 	use the speed sensor for the cruise control that's built in to the
> 	speedometer to send the 4000 pulses/mile signal that the ECM is
> looking
> 	for??  If so, is that 4000 gnd pulses or 4000 +12v pulses or some
> other
> 	signal that I should be trying to send?? 
> 
> 	 Drive ecm with open collector 
> 	 Also, other than mileage, what
> 	other affects would there be from running without the VSS??
> 
> 
> 	IAC will not reset
> 	Prior to removing the stock 2.8, I had installed Edelbrock headers
> which I
> 	am now using on the 3.4L.  The ECM is looking for 2 o2 sensor inputs
> and
> 	the headers are only plumbed for one.  Since there is continuity
> between
> 	the two sensor wires both key on and key off, I am only running one
> and I
> 	do not have the MIL illuminated at all times.  Also, the headers are
> not
> 	plumbed for EGR so I am planning on finding the passenger exhaust
> manifold
> 	from the Camaro and grafting the EGR port to the headers on the
> passenger
> 	side as well as an 02 sensor bung on the driver's side.  As I said
> 	previously, I do not have a constant nor a flashing MIL indicator so
> I am
> 	wondering what the consequences of running without EGR and the
> second o2
> 	sensor may be??
> 
> 	The ECM was from a manual transmission Camaro and the truck has the
> 84
> 	700r4 which seems to be a good match, but I was hoping to be able to
> use
> 	the ECM to control the TCL once the VSS and other issues are
> resolved.  Is
> 	this possible and if so, what would be involved in doing this?? 
> 	Yep but you need to change prom to auto.  Fairly cheap for stock one
> from gm
> 	Or find someone with a auto bin and getum to burn you a chip :-)
> 	 I know
> 	the wiring is there in the engine wiring harness and I can make the
> 	electrical connections, but certainly it won't be that easy since
> the ECM
> 	is setup for a manual transmission.
> 	Not ecm, just prom  ecm used on both
> 	Also, I am interested in finding out more about reprogramming the
> ECM and
> 	was wondering if that would require burning a prom or can the ECM be
> 	flashed with new code??
> 	Doh scratch that last idea, I think your ecm is pcm and flash
> 	  Whatever the answer, if you know where I can find
> 	the equipment to do this, it would help a lot.  Also, where would be
> a
> 	good place to start learning about the inner workings of the ECM??
> I have
> 	some programming background (VB and Access mainly) so the concepts
> are not
> 	completely foreign to me.
> 	Any and all help with this is greatly apreciated.     
> 	Ready to do some reading? :-)
> 	http://www.geocities.com/MotorCity/Shop/9938/index.html
> <http://www.geocities.com/MotorCity/Shop/9938/index.html> 
> 	http://www.cruzers.com/~ludis/ <http://www.cruzers.com/~ludis/> 
> 	http://www.eecis.udel.edu/~davis/gm-eproms/
> <http://www.eecis.udel.edu/~davis/gm-eproms/> 
> 	http://efi332.eng.ohio-state.edu/diy_efi/oem/gm/prog_101.html
> 
> 	Read these over more that once mabe 3 times you will get it if you
> have the drive :-)
> 
> 	--UAA03368.940996655/gonzo.wolfenet.com--
>