Hi, i have a gmc vandura 1991 4x4 pathfinder.
the vehicle doesn't have the o2 sensor, but it does have a tbi system with a computer, everything's original and runs nicely.

I would like to install an o2 sensor (single wire) on the exaust, and to connect it to the computer.

which wire/pin number on the ecm should i connect it to?

and should i put a chip or an eprom on the ecm, and if so, which one to use and where to get one?

 

Uh, this is thirdgen.org dude

 

CE light missing too?

PO took out the prom and the NB 02 sensor? Prob cut the wire to NB02 and left wire hanging. Maybe look for that and repair. ACDelco on the NB 02 sensor. Heated is a good idea.

 

the problem is, this car originally came without the sensor - since i live in israel and they didn't permit it then. Now, i need to make an complete installation from scratch.
Also, could you explain what is the "CE light", and the "PO" and the "NB"?
thank you

 

Po = previous owner, Ce= check engine , nb=narrow band , is this a 1227747 ecm?
there are schematics at gearhead-efi.com You might need to check the 3 to 4 letters on the eprom some of the export calibrations never went into closed loop.

http://www.gearhead-efi.com/BCCFind/

 

It is our secret lingo and of course a secret handshake as well.

PO prior owner
NB narrow band 02 sensor vs wide band 02 sensor
CE check engine light also known as a SES or service engine soon light

some where here there is a list of acroynms used on this site.

It is very interesting that NB02 is not allowed. Some of the older marine apps may have no NB so the engine runs off open loop(OL) with predetermined fueling.

BS is my favorite

 

Guys, thanks a lot for the help. could you pls look at the image - is it enough to recognize the ecm or do i need to open the ecm and look for those letters you mentioned on the eprom?



https://picasaweb.google.com/lh/phot...eat=directlink

 

http://www.gearhead-efi.com/BCCFind/...shtml?BCC=awbr

calibration for leaded fuel ;(

 

BCC: AWBR
Year: 1991
EPROM: 16154353
ECM: 16147060
Platform G3
Engine L05
Displacement 5.7L
Tran MT1 AUTO

 

Thank you again, I've made some progress and a new question:

i've taken a picture of the eprom and i've got the schematics of the ecm connector.
first, i think i've identified the wire that's supposed to go to the o2 sensor on the exhaust(my car doesn't have the sensor yet, i'll install it).
this wire's grey, but the schematics indicate that's supposed to be purple(PPL) as you can see in the D7 pin connector on the ecm.
The number on the eprom is 4354 (as seen in the image).
Now the question is: if i install the o2 sensor and connect it to the grey wire (the D7 pin on the ecm) - will the ecm work on the closed loop?
or will i need to change the eprom4354 to a different one?
And if such a change is needed, could you tell me of the eprom that will work on a closed loop, and where can i buy it?
Here are the images:


https://picasaweb.google.com/lh/phot...eat=directlink



https://picasaweb.google.com/lh/phot...eat=directlink

 

If the calibration is specific for open loop operation the O2 sensor input will be ignored.

You'll need to get G2 adapter PCBA from Moates.net
http://www.moates.net/g2-memory-adap...g-spacing.html

and some blank FLASH EPROM's SST27SF256 or SST27SF512.
http://www.moates.net/c2-sst-27sf512-chip.html

You'll also need EPROM programer - I use GQ-4X from MCU mall:
http://www.mcumall.com/comersus/stor...idproduct=4282

Add TunerPro
http://www.tunerpro.net/

and you have a complete 'tool set' to do your own EPROM programming - some soldering is required to install 28 pin DIP G2 PCBA into your ECM which uses 24 pin DIP socket for 2732A PROM. DO not bother with old UV PROM chips. It is best to leave them as they are and use modern flash chips instead. However, before starting I would strongly recommend for you to read EPROM programming sticky. It contains a lot valuable information collected over the years to minimize frustration levels that may otherwise arise.

//RF

 

This should be a 27c256 in the memcal. The easiest way to see if this .bin in your eprom is setup to go into closed loop would be to install a oxygen sensor in your exhaust manifold if there is a spot for it if not get a heated o2s and jumper the aldl pin a to b and put the ecm in field service mode. If the ecm goes into closed loop when the engine is warm the blinking of the service engine light will slow down to indicate closed loop. Leaded fuel is a killer on oxygen sensor. The only other way to check the .bin is to read the eprom in a reader/programer and look at it in tunerpro $85 mask but you will need to make a header to insert into the bottom of the memcal to read the eprom. There are more calibrations at the link.

http://www.gearhead-efi.com/Fuel-Inj...Information-85

 

Thank you, but i don't want to get into a complicated project - i'm thinking to accuire only the EPROM for the GMC 1991 vandura with ecm 16147060 California state - because they had emmission regulations obligated to work with the closed loop o2 sensor.
Could you tell me what was the EPROM number for my ecm - 16147060? And where could i get one?
thanks,
guy

 

The pinky finger lock up? This is top secret.

 

All the Broadcast codes I can find for the 16147060 ecm say for leaded emissions. Codes for 5.7L tbi automatic ATAC, ATAD, ASZX , AWBK, AWAY, BAMW, AXXU, AXXX, AXXZ, BAJW . You should switch to the 16197427 ecm. You can find these ecms on ebay u.s and maybe able to get one shipped internationally. You might need to repin for this ecm and I think your ecm uses a external knock module and the 427 uses a internal one so that can be bypassed. Just run the broadcast code before you purchase a ecm and memcal.

 

http://www.ebay.com/itm/95-96-97-CHE...bebfd9&vxp=mtr