SuperSonic
12-07-2004, 12:01 PM
Maybe someone out there has a suggestion on what the problem might be. My "second" vehicle is a 1996 F150 4X4 with the 4.9 six and a 5 speed. I bought the truck brand new and currently have 142,000 miles on it and this is the first problem I have had with the engine. When I drive it, and shift, the rpm's will stay where they are at, and even slightly rise for a few seconds then drop down to normal. For example, I shift from second to third at 2000rpm, the rpm's will remain there and even go up a few hundred when I let off the throttle and push in the clutch, if I coast with the clutch in and foot off the throttle, in about 3 seconds they drop down to where they should be. It only seems to do this above 1500rpm, below that everything runs normal. The truck runs and idles like new, I checked everything to make sure nothing was binding, and lubricated what I could. I used a code reader and it spit out code P0122: Throttle/Pedal Position sensor A circuit low Input. I replaced the TPS and cleared the codes but it does the same thing and the trouble code reappears. I checked for vacuum leaks, intake leaks, I checked the fuel pressure and also replaced the IAC valve. My next step is to remove the throttle body, clean it really good (supposedly has a special coating on it and you are not supposed to clean it, but I don't care anymore), and replace the gasket. I'm running out of ideas. Anyone have any suggestions?
Any help is much appreciated.
Thanks,
Craig
Any help is much appreciated.
Thanks,
Craig