Transmission diagnosis/opinions
 

Hi,
I'm having a tranny problem with a cargo van and wonder if anyone might have any ideas on the problem. Vehicle is a 2000 Ford with a 4.6 motor, pretty sure the tranny is a 4R70W. The problem occurs when coming to a stop, the RPM's will fall and the engine stalls, re-starts and runs great in park or neutral, shift to drive or reverse and stalls again unless I two pedal it to keep the RPM's elevated. Once vehicle is underway shifts out fine with no slipping, until coming to a stop, repeats scenario again. I suspect the torque converter isn't unlocking and stalling the engine. Could the torque converter control solenoid be failing or sticking? I know this isn't an automotive forum but I thought I'ld ask,Thanks!
Steve

Possible but not likley. When a convertor or solenoid sticks in lock up, it feels like a standard with the clutch engaged. Dropping it into gear will lead to a very LOUD BANG and stall. NO "two footin" it will keep it running in gear without smoke being involved.

I would suggest scanning the trans range sensor. Typical ford issue. PCM thinks the trans is always in park.

I would also check the idle air bypass for carbon build up sticking the valve. More common in colder weather.

I already tried cleaning the IAC valve and then replaced it with no change. The vehicles at the dealer and they're saying it needs a torque converter and valve body at minimum or a remanufactured tranny, $2000 or $2700, take your pick! I'm not convinced it's totally shot, but it might be. It just runs to good otherwise, i would think I would be experiencing slipping if the tranny was junk.
Steve

Just wanted to update Airpacker, changed the TCCS,fluid and filter and problem gone. It's nice to be done chasing my tail! Steve

Well that saved you a LOT of $$$$$. :) Goes to show, do the simple, cheap things first. :coolcowboy: