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Message: [QUOTE="Mdub707, post: 576367, member: 107"] I can get what you guys are talking about by simply removing one of my old program 7 pin FICM's and put a newer 4 pin on. The old 7 pins I have, clearly have different programming on them. The injectors buzz way faster at initial key on and always run quieter and smoother on first start up. To add to that, I have some FICM's that test at 48V across the board, but will barely keep an idle going and sometimes sound like they cut out to 4 cylinders. I literally can't even start the truck in the cold without being plugged in with some of them. I think the programming plays a huge role on them, not just the tuning, but how they were programmed from the factory. I think the rollback tuning is a great idea for these things. The same 7 pins that idle smooth on my truck, also make it feel like there is way more throttle response. Anything under 1/2 throttle gets the truck moving way easier than the 4 pins. Also, FWIW, when I start my truck in the ice cold after it's been sitting a while, I don't go off the WTS light, since that's independent of the glow plugs anyways, I actually listen for the injectors buzzing. I will let them buzz through a completely cycle, then turn the key off and on again and let them buzz for a second cycle to sort of pre-warm the spool valves. This has always proven to me to have much smoother start ups. [/QUOTE]

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