Torque converter lockup ??
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Joined: Oct 2007
Posts: 82
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From: California
Torque converter lockup ??
Hi all.
I have a factory stock 1993 C-4 with a 4L60 transmission. My torque converter doesn't seem to locking as it should but i'm not sure.
Does anyone know the specs for TQ lockup? At what speed minimum, which gears, etc.?
I've done the preliminary tests and all seems to be well with the external wiring and switches. I've also temporarily wired in a switch between the A & F terminals of the ALDL plug. That switch does not seem to effect the TQ no matter which position I put it in.
Thanks for any responses.
Norm.
I have a factory stock 1993 C-4 with a 4L60 transmission. My torque converter doesn't seem to locking as it should but i'm not sure.
Does anyone know the specs for TQ lockup? At what speed minimum, which gears, etc.?
I've done the preliminary tests and all seems to be well with the external wiring and switches. I've also temporarily wired in a switch between the A & F terminals of the ALDL plug. That switch does not seem to effect the TQ no matter which position I put it in.
Thanks for any responses.
Norm.
Thread Starter
Advanced
Joined: Oct 2007
Posts: 82
Likes: 0
From: California
Rod,
Thanks for your input. I am aware of that test and, yes it does lockup sometimes. The problem is that I'm not sure under what conditions it is supposed to lockup so I can't tell if it is locking when it is supposed to or not.
What I really need, if anyone has the answer, is the answer to these two questions:
At what minimum speed is it supposed to lockup?
In what gears is it supposed to lockup? 3rd & 4th, just 4th, etc.?
I am aware that it shouldn't lockup under hard acceleration or below a certain speed. Also, as I said, I did wire a temporary switch between the "A" and "F" terminals of ALDL connector. With the switch in "On" position the torque converter should be locked up manually however that doesn't seem to work (At least not at speeds up to 55 MPH).
Thanks all in advance for any thoughts.
Norm.
Thanks for your input. I am aware of that test and, yes it does lockup sometimes. The problem is that I'm not sure under what conditions it is supposed to lockup so I can't tell if it is locking when it is supposed to or not.
What I really need, if anyone has the answer, is the answer to these two questions:
At what minimum speed is it supposed to lockup?
In what gears is it supposed to lockup? 3rd & 4th, just 4th, etc.?
I am aware that it shouldn't lockup under hard acceleration or below a certain speed. Also, as I said, I did wire a temporary switch between the "A" and "F" terminals of ALDL connector. With the switch in "On" position the torque converter should be locked up manually however that doesn't seem to work (At least not at speeds up to 55 MPH).
Thanks all in advance for any thoughts.
Norm.
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
This A/F switch will override the TC lock signal from the ECM. Except for first gear. So if you engage the switch from a standstill, the TC will lock once the 1-2 shift engages. Then each upshift of the trans will happen with a locked TC.
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
I downloaded and run a stock bin for a 93 in Tunerpro.
TCC settings are related to throttle %TPS v mph ;
but 44 mph appears to be the TCC lockup point
There are lock / unlock settings for both 3rd and 4th gear.
TCC settings are related to throttle %TPS v mph ;
but 44 mph appears to be the TCC lockup point
There are lock / unlock settings for both 3rd and 4th gear.
Last edited by rodj; Feb 7, 2009 at 01:49 AM.
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Burning Brakes
Joined: Feb 2008
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From: Sarasota Fl
-Jonathan
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
Tuner-Pro is the aftermarket program that lets you datalog or adjust the tune on your ECM (with the right equipment)
The original codes (BINS) are available free from many sites.
Even if you don't connect to car ,you can do what I did for you and just open the bin to see the factory settings.
The original codes (BINS) are available free from many sites.
Even if you don't connect to car ,you can do what I did for you and just open the bin to see the factory settings.
