ISX good bad and ugly?
#2
It sucks with the EGR functioning. I unplugged my EGR and had my ECM reprogrammed and it made a huge difference. I have an '06 ISX with two different ECMs. Even with the low power one (550 HP / 1750 ftlbs) it runs great. With the reprogramming, I like the ISX far better than my old C15, and I'm averaging well over a full MPG better than I did before the reprogramming or what I got with the C15.
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