Loss of power

[James S]

I've got a '01 F-250 7.3 with 160,000 miles on it. Have had no problems out of it til just recently. My transmission started acting funny the other day. When shifting from first to second, it would just rev on to 3000. You would have to let off for it to shift. And no, I did not say slip. It held the gear just held it too long. It did this pulling a trailer and not pulling one. Took it to the transmission shop (friend of mine) and he put his scanner on it. Had a wastegate code and a PO603 code. He said pull my programmer (superchip set on tow-safe mode) off and we would take it to a buddy of his at the dealership. Took the programmer off and now the truck acts like the wastegate is staying closed; has a substantial loss of power. Only difference is that it does not idle high. Put the programmer back on, has more power and now has hard shifts and doesn't hold first gear like it was. Any suggestions?

[James S]

Ok, somebody on here's got to know something.

[Banshee34]

Well the first problem you wrote sounded like a TC but I'm not sure about the code you pulled, so gonna bump this up for ya!

[Banshee34]

Can someone help please?

[strokethis69]

i would pull my tranny pan and put a new filter and fluid in and if it has a in line filter from the cooler i would also change that

[James S]

Just did this at 150,000 (which was in October). Fluid had no metal in it and still looked pretty good. Still running fine now except for the hard shifts. But, took the programmer back off today and it did the same thing-regular idle, but low power as if the wastegate was closed.

[James S]

Throttle position sensor maybe? Guy at the ford place said sometimes when the sensor is bad it might throw a code..might not.