I have a 1991 Camaro RS with a 305 TBI (L03). th700r4
What ECM do I have? I looked on the cart in the tech articles, but I didnt see anything listed that would cover my car...

 

its the 7477 ECM.

 

Why would they put a truck ecm in his car?.

 

what a min., 7477
what is that out of?.
At a glance I thought you had posted 7747

 

You should be able to get some part numbers for your car off of the ACDelco website. Just put your car info in and pick a part.

http://www.acdelco.com

 

The 89-92 L03 305 uses the 8746 ECM.

 

OK, now I have 2 numbers... is it 7477 or 8746 8746? Also, what baud does it operate at?

 

I have a 91 Firebird with a 305 TBI engine and I believe that the ECM is 1228746. I was able to follow the instructions and use the free program on the following web page and receive the from the ECM.
http://w1.601.telia.com/~u60113744/s...dl/winaldl.htm

Other useful information such as schmatics, etc. for various ECMs can be found at
http://www.cruzers.com/~ludis

Mike S.

 

Excellent. I got all da stuff to make the cable, i got the program...I just gotta fiund time to play with it (I couldnt bare to make it and not have time to use it!!)

 

One thing I forgot to mention is that I have a 5 Speed Manual transmission, but I believe it is the same ECM for the automatic transmission.

Mike S.

 

Does anyone know where I can find the schematics for an LG4 ECM? The page mentioned above has everything but©

 

I dunno, maybe chiltons?

 

Chilton's does have a wiring diagram for the ECM inputs and outputs for a "1985 5.0L carbureted engine" (I have an '85 Sport Coupe LG4), but I don't trust it because I couldnt find the electronic spark control module in the schematic, and my car definitely has one.

I like the way the diagrams in the Haynes manual are laid out, but they only have one for '84 L69's and one for '84 LG4's, and those are different computers. I don't really need the schematic, but I'm just curious to know where I can find one.