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Lextech
October 27th, 2007, 01:03 AM
I am installing a GM LS type PCM onto a non LS engine. I am trying to install CNP ignition instead of a distributored ignition. I believe I have the mechanicals and wiring figured out. I am trying to change the injector bank assignments. The tune is set for 18736542, but I want 18436572. I tried to change the assignment, and now all of the injectors are assigned to Bank 1. I even tried a Copy/Paste from another tune of table B3704 and still it is set to all Bank 1. Any Ideas? I suppose I could just swap a couple of pins at the PCM, but I figured I would do it in the tune.
scuzz
October 27th, 2007, 07:53 AM
Are you on the Caddy engine now?
Lextech
October 27th, 2007, 01:01 PM
Actually 2 projects. I'm trying to get CNP ignition figured out for non LS distributor ignition engines.:muahaha:
joecar
October 27th, 2007, 03:29 PM
Can you simply swap the injector wires for 2 pairs of cylinders...?
dc_justin
October 27th, 2007, 04:35 PM
Can you simply swap the injector wires for 2 pairs of cylinders...?

And ignition. ;)
Lextech
October 28th, 2007, 12:07 AM
Well, I have been into table B3704 about 10 times now. 2 times ago when I opened the tune, 2 of the cylinders were in the right place, but I couldn't get the other 2 to reassign. Now I just opened the tune again and all 8 are where I want them :nixweiss:
Lextech
November 3rd, 2007, 07:49 AM
Another question.

Does B3704 also assign the injector firing order or just the ign. firing order?
S10Wildside
July 14th, 2008, 08:56 PM
I thought I noticed a difference in the firing order between a 98 and 02 LS1, but I had the wrong calibration file open. The original message was removed to avoid confusion.
S10Wildside
July 14th, 2008, 09:00 PM
I am installing a GM LS type PCM onto a non LS engine. I am trying to install CNP ignition instead of a distributored ignition. I believe I have the mechanicals and wiring figured out. I am trying to change the injector bank assignments. The tune is set for 18736542, but I want 18436572. I tried to change the assignment, and now all of the injectors are assigned to Bank 1. I even tried a Copy/Paste from another tune of table B3704 and still it is set to all Bank 1. Any Ideas? I suppose I could just swap a couple of pins at the PCM, but I figured I would do it in the tune.

Don't forget about 3 and 2. Injector 7 and 4 need to be swapped and so do 3 and 2. Same goes for the coils.
GMPX
July 16th, 2008, 01:48 PM
It would be easier to rewire the harness to match the LS firing order to that of the other motor.