Something is definatly wrong. It's probably something simple. I wonder if replacing the icm with a later model would help. Idk. I've got a xle4 on the way. I'm gonna have it shipped to a tuner and see if they can help with the lame e99 shifts. Anyone know of any good tuners?
Not sure what the stock PCM has to do with how the new pcm's operate? With the new PCM installed, I would not pull the truck out on the highway. It would take 3 miles to reach 55 mph. THAT IS NO EXAGGERATION!!! The truck has zero power.
When the new PCM is in, it acts like its in whisper/ valet mode. It's quieter and don't rev up as quick as it should. This is with any 99.5 and up PCM. Pmt1/2 nvk2/4 etc......
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I recently posted this on another powerstroke site and couldn't find an answer. Maybe you guys can help.
I wanted to upgrade my e99 xle4 PCM with a xc3f strictly for the better shifting strategy. Once I installed...