converter lockup?
Butt-Head
Joined: Apr 2004
Posts: 9,456
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From: Reed Point, MT
Originally Posted by oldblue31
How can I keep my torque converter from locking up so quick.It lugs at low speeds and of course The power difference while towing is considerable.
On a 95 PSD, the torque convertor clutch wire is a purple with yellow tracer in a connector underneath the master cylinder. It's a 12 way kind of squared-oval shape. This wire supplies a ground to the convertor clutch solenoid.
If you would like to disable the TCC, then all you need to do is wire in a switch that opens the circuit when you don't want lockup. However, there is some danger in this concerning trans. fluid temps when allowing torque convertor slippage. Ford locks up the TC very early on these 7.3L trucks to combat heat buildup; and yes, it is VERY annoying.
So, it's not a bad idea as I've toyed around with the idea myself...a 3 pole switch to open, close, or allow normal operation.
You will get a check engine light however.....no worry.
Cody
Cargo Master
Joined: Dec 2003
Posts: 2,182
Likes: 7
From: Saint Augustine, FL
Originally Posted by cleatus12r
So, it's not a bad idea as I've toyed around with the idea myself...a 3 pole switch to open, close, or allow normal operation.
You will get a check engine light however.....no worry.
Very bad idea. Inhibiting the TC engagement will set a transmission code and put the transmission in failsafe. The transmission won't live long in failsafe.
Even if you could inhibit TC lockup without setting a trans code, it would overheat the transmission. The E4OD in that truck is intended to run in lockup.
I had a '96 F350 PSD dually. It should have plenty of power in lockup. I pulled a 44' Pace car hauler with two cars in it. No problem.
I guess I don't understand why you are having trouble.
Steve
'95 Clubwagon XLT
Butt-Head
Joined: Apr 2004
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From: Reed Point, MT
Originally Posted by Clubwagon
Very bad idea. Inhibiting the TC engagement will set a transmission code and put the transmission in failsafe. The transmission won't live long in failsafe.
Even if you could inhibit TC lockup without setting a trans code, it would overheat the transmission. The E4OD in that truck is intended to run in lockup.
Even if you could inhibit TC lockup without setting a trans code, it would overheat the transmission. The E4OD in that truck is intended to run in lockup.
As in "failsafe", I hope you mean max line pressure......that's the normal default most auto makers go for in the case of a transmission failure mode. However, if the slippage is not exceeding a certain amount of time (90-120 seconds for GM-built vehicles), then a code is not going to set for transmission component slipping ( P1870 code in J-1850 OBD2 protocol). Max line pressure is not going to hurt anything in the tranny unless you've got a TON of power during shifts. The most you'll get for a code if only maintaining convertor slip for a few (<20 seconds or so) would be a "TCC circuit open or short" code.
Cody
Cargo Master
Joined: Dec 2003
Posts: 2,182
Likes: 7
From: Saint Augustine, FL
Originally Posted by cleatus12r
As in "failsafe", I hope you mean max line pressure......that's the normal default most auto makers go for in the case of a transmission failure mode. However, if the slippage is not exceeding a certain amount of time (90-120 seconds for GM-built vehicles), then a code is not going to set for transmission component slipping ( P1870 code in J-1850 OBD2 protocol). Max line pressure is not going to hurt anything in the tranny unless you've got a TON of power during shifts. The most you'll get for a code if only maintaining convertor slip for a few (<20 seconds or so) would be a "TCC circuit open or short" code.
Once that code was set, the trans would go into failsafe, run at full line pressure and inhibit lockup. That would ruin the transmission.
Steve
'95 Clubwagon XLT
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Butt-Head
Joined: Apr 2004
Posts: 9,456
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From: Reed Point, MT
To go back on what I said, a P0743 will set if the torque convertor clutch solenoid circuit is opened (disconnected). A P1728 will set if slippage is detected in 3rd or 4th gear and the torque convertor is commanded on and the calculated slippage between turbine RPM (effectively engine RPM with the convertor locked) and output speed sensor is out of range.
I can't see Ford's reasoning for going max line pressure for a simple TCC circuit code. Yes definitely with the slippage code.....however, a time period should have to pass before any corrective (or "save the transmission") action takes place.
I don't know for sure on this, so maybe it's better to not try anything.....
It will be a good project for me on Saturday to try.
Cody
Sorry for the confusion with the GM terminolgy and specs....it's just that I work on these things on a day to day basis and I'm not familiar with Ford's early OBD2 stuff.
I can't see Ford's reasoning for going max line pressure for a simple TCC circuit code. Yes definitely with the slippage code.....however, a time period should have to pass before any corrective (or "save the transmission") action takes place.
I don't know for sure on this, so maybe it's better to not try anything.....
It will be a good project for me on Saturday to try.
Cody
Sorry for the confusion with the GM terminolgy and specs....it's just that I work on these things on a day to day basis and I'm not familiar with Ford's early OBD2 stuff.
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Cargo Master
Joined: Dec 2003
Posts: 2,182
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From: Saint Augustine, FL
Originally Posted by oldblue31
well, you guys know way more than I do but thanks for the info.The bog that was mentioned is exzctly the problem i'm trying to get passed.
Steve
'95 Clubwagon XLT