Good Morning Gentlemen,
I have been going through the searches here on this forum for help related to my issue. I do not have a diesel. I do have a F150 however. I have been chasing this issue for the past year and a half. I do not know where else to go in my troubleshooting. I have been going through the pinpoint tests in accordance with the 1996 F Series tech manual here but have not come to any solid conclusions. I have a code 633 for the 4x4 switch in Low. I have a manual Transfer case. So I don't know why this would be an issue. The truck will not shift by itself. I have to do it from 2 to D with OD off and then go to OD. PSOM has been calibrated to the 33's, VSS is good ( no shake in the needle unless at 65-70 then its very slight), Speed Control works just fine. MLPS was replaced with a Ford part a year ago, no change. Just did it again yesterday with Pinpoint Test D. TPS is new, Tested iaw spec. Map sensor tests fine although I couldn't go through the range with a vacuum pump. I borrowed a Meter that tests HZ but my pump broke.
I am asking for help here. I know there is a Ford Transmission engineer here. I would love your help sir along with anyone elses. I do not know if this is allowed but I have the whole history on this link here(F150 Online/ Pre 1997 models/no-power-horrible-surging. Sorry it wont let me paste the link ). Please let me know if someone has something I am missing. I am about thinking either I have a bad PCM or something internal to the transmission. I do not want to give up on this truck but I am close. It is costing me weekends with my family.
Thanks for reading.
I have been going through the searches here on this forum for help related to my issue. I do not have a diesel. I do have a F150 however. I have been chasing this issue for the past year and a half. I do not know where else to go in my troubleshooting. I have been going through the pinpoint tests in accordance with the 1996 F Series tech manual here but have not come to any solid conclusions. I have a code 633 for the 4x4 switch in Low. I have a manual Transfer case. So I don't know why this would be an issue. The truck will not shift by itself. I have to do it from 2 to D with OD off and then go to OD. PSOM has been calibrated to the 33's, VSS is good ( no shake in the needle unless at 65-70 then its very slight), Speed Control works just fine. MLPS was replaced with a Ford part a year ago, no change. Just did it again yesterday with Pinpoint Test D. TPS is new, Tested iaw spec. Map sensor tests fine although I couldn't go through the range with a vacuum pump. I borrowed a Meter that tests HZ but my pump broke.
I am asking for help here. I know there is a Ford Transmission engineer here. I would love your help sir along with anyone elses. I do not know if this is allowed but I have the whole history on this link here(F150 Online/ Pre 1997 models/no-power-horrible-surging. Sorry it wont let me paste the link ). Please let me know if someone has something I am missing. I am about thinking either I have a bad PCM or something internal to the transmission. I do not want to give up on this truck but I am close. It is costing me weekends with my family.
Thanks for reading.