PCM Diagnostics & Tuning - Firing order?
12-07-2006, 12:54 PM
I am looking to change a 99 SS OS to a 02 OS and while doing this I noticed that the firing orders between the 2 year models are different. Has anyone else noticed this and why would GM do this the 99 order is cylinders 31872654 and the 02 is 18726543?
I dont know which one to use.
Can someone tell me why?
12-07-2006, 01:07 PM
Both those are the same, look at it carefully:) Does it matter that the 3 makes a difference? I wouldn't think so
12-07-2006, 01:13 PM
i guess for some reason they have cylinder 3 in the cell to fire 1st on the 99 file and cylinder 1 fire 1st on the 02.
I guess it doesnt matter which one is first in the cells as long as the order in which the cylinders are right
Thanks over looked that one
12-07-2006, 01:15 PM
On the first one, start at 1, and you will see that they are the same.
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