so my 97 E350 7.3psd 4x4 van has had the blinkin OD light go off for me and then hard shifting (until i restarted). i took it to a buddy who happens to run a shop (and does trannies) which is where i scanned it for the 1728 code. they hooked it up to the diagnostic equipment and drove it alot, stating it drove nice and all perimeters seemed normal (vehicle speed included) with the exception of the computer was never commanding the torque convertor to lock up.
but they never got it to throw a code again and recommended i just drive it, 27 miles later i got a flashing OD light again. they are kind of stumped and think i have 2 things going on, a computer problem not asking for lock up, and something within the tranny maybe, but hate to just throw $ at unknowns
thoughts? its the stock tranny (e40d right?) with a transfer case adapted from a 06 f250. auto trannies are not my area of expertise
thanks for the reply, i do know they used there scanner to read all such things and did mention to me the brake light switch was working, VSS was giving accurate enough reading to the speedo, manifold pressure etc etc.
as for whether or not all my brake lights are working, i will check, thats a weird one, and have heard the same for dome light and fuse (which i did check)
so i just checked my brake lights, yeah, my center/third light is not working, i will fix that tomorrow.
so, would something as weird as a burnt out brake light be throwing the 1728 code, or will it just keep the computer from commanding lockup and i still have another problem throwing the "1728 trans slip error"
got the lights swapped out on the 3rd brake light and went for a drive, about 20 miles in the OD light started to blink again. the code reader gave me the same code (1728) but does not allow me to clear the code (NAPA reader give me an error) but i wouldnt think a code stored in memory would be giving me trouble, but i will go clear it tomorrow with my buddies real reader
cleared the codes this AM and light strated blinking again. I do not have access to a scanner right now to see if lock up is being commanded or any of that good stuff, but van seems to drive fine by the seat of my pants reading.
what to try next? and could this be caused by a bad tank of gas? ironically started having problems right after a fillup so worth wondering about.