P0740 TCC Failure
Hello All, I have at least two issues that I need to address. The P0740 code as well as a flashing ECC temp. First a brief history. Please bear with me as this is my first post beyond hello. Any and all suggestions are welcome. I recently purchased an Actron CP9145 scantool and am still trying to learn what all of the live info means. Also, I am not real clear on TCC lockup so I may confuse the terminology. These are the initial codes that I found:
P0406- Linear EGR- Pintle Position Error
P0640-Quad Driver Module QDM 1 Fault-check evap canister +TCC Apply Solenoid
P0740 TCC Converter Clutch Failure
Replaced the EGR with used one from J/Y
New BCS (after performing test per Tech info) Full boost now instead of 2 lbs.
Installed larger tranny cooler
Adjustable Vacuum boost modulator (btw, shifts out of first a lot sooner now, I turned it 1 1/2 turns clockwise)
Oh, I almost forgot, I recently replaced the heater fan motor due to excessive noise. The vacuum line going to the box on the firewall broke. I spliced it with some rubber hose and zip ties. Now whenever a vacuum hose is removed and reattached such as when I replaced the vacuum modulator a couple of days ago. I hear the vents on the passenger side creaking. There was a little tranny fluid in the old modulator. If I turn the key on but do not start the engine the creaking and flashing goes on for about a minute before it stabilizes. When I start the engine the creaking and flashing starts again. Once everything stabilizes I can change modes and vent positions with no creaking or any thing out of the ordinary. If I turn the engine off the whole process starts again when I start the car up again and hot air blows for a few seconds. From what I have read, which is a lot since I intend to at least skim all of the posts in this section (up to page 200 so far), I suspect that I will be looking at the Vacuum connections under the dash next. By the way, I have sprayed Carb cleaner around all vacuum hoses. supercharger base, etc, There was a leak where the EGR goes into the supercharger, I tightened it and no more leak there. I have not looked at the actuator arm to see if it moves or binds yet. I understand that there is a module that controls all of the vacuum lines which I have also not looked at.
About the TCC issue: Like many others everything seems to be fine until the car has been driven for 10-15 minutes. During that time I go WOT several times to try and aggravate the problem. I drive the same route to try and replicate the issue and it usually kicks out of overdrive about the same place. This is after WOT up a slight grade. I can stop turn off the ignition, open a door to kill all power, restart, come up to 65, engage cruise control and it will not lose overdrive until I disengage cruise control. I did record live info from the scan tool today. Also, the fluid was completely flushed two weeks ago, there is no burnt smell or brown color and the fluid level has not moved.
Stats on highway before loss of overdrive occurs:
LT Fuel trim 138, LT Fuel tr CL 16, Evap duty % 15, Cooloant 185, EGR vlv pos%(v) 4.3/2.8, Exhaust O2 Rich/Lean, IAC position 93, Loop Status Clsd, MAF 34/18, IAT 72, OSs (mv)53/838, TCC applied Yes/no mostly no, TCC duty cycle 78, TCC Slip RPM 155/220 drops to negatives when off throttle, TPS Sensor .84, Trans Temp 167, Average speed 65 mph, outside temp around 65 degrees.
Sorry for the long post but I am trying to include as much info as I can up front.
1995 Bonneville SSEI
1994 Buick Park Avenue