Originally Posted by
billygraves
You would be farther ahead of the curve IF you moved to the 1989 6E ecm code. The software on the back half of the chip is the latest and last GM wrote for this 165 ecm and is much better. You would have to transfer a few cals but the benefit is well worth it. It would be nice to "Translate" the cals from the 86 to the 89 like we did at work. This would take a few hours of knowing every cal and it's meaning on both sets.
I move to the last year used when I select a controller to gain the benefits. GM did all the work and corrected and enhanced the code to function the best.
One item you can see the diff on 86 vs. 89 is the Mode 4 commands you can write for overrides. The 86 has to have continual mode 4 commands sent, where the 89 only has to execute one. But the 89 you have to send a stop or null mode 4 when you are finished with your over ride to stop the override. Idle control via IAC position or RPM, Fans, clear Block learn cells.