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Old 11-29-2011, 03:57 PM
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F550 & Spartan 250 tune

Help. I was helping a friend install his tuner this evening. During the install, after the reflash, and while it was erasing files, I misread the tuner and turned the key off, when it read "Do Not Turn Key Off". The guy's at Spartan emailed me the original stock tune, I installed it, but the tuner will not communicate with the truck. They say that the TCM may be gone. Has anyone had this happen to them? Is there an option to either reset, or repair the TCM?

Also, does anyone know what he can expect for fuel mileage gains with this config? (once it is running of course) Thanks in advance.
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Old 11-29-2011, 04:04 PM
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Not the TCM, the PCM is probably fried and need to purchase a new one. Not sure of the cost, but a few hundred I believe.
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Old 11-30-2011, 05:05 AM
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Quote:
Originally Posted by Fordcrazy View Post
Help. I was helping a friend install his tuner this evening. During the install, after the reflash, and while it was erasing files, I misread the tuner and turned the key off, when it read "Do Not Turn Key Off". The guy's at Spartan emailed me the original stock tune, I installed it, but the tuner will not communicate with the truck. They say that the TCM may be gone. Has anyone had this happen to them? Is there an option to either reset, or repair the TCM?

Also, does anyone know what he can expect for fuel mileage gains with this config? (once it is running of course) Thanks in advance.
Most likely the TCM, I had the same thing happen once. Turn the key to the on position, is light on the shift indicator (Park) on or off?
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Old 11-30-2011, 06:00 AM
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Ouch. I would agree, PCM is probably the issue. Whether it's fried or recoverable, don't know but it could cost you either way.

As for gains, don't expect allot. The higher the gear ratio in the back, the more tires you have and the weight of the vehicle impact the mileage quite a bit. Some 450 owners have even reported no gains. Haven't heard to many reports on the 550's though, so let us know.
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