Converter Unlocks When Decelerating
Thread Starter
Le Mans Master
Joined: Nov 1999
Posts: 8,512
Likes: 3
From: Memphis, Tn
Converter Unlocks When Decelerating
On the highway, when I lift off the gas but not on the brakes, the torque converter unlocks. When I ease back into the gas, the converter locks back up. I thought the converter shouldn't unlock unless the brakes are applied or the car is going slower than 35 mph. What could be causing this?
Le Mans Master
Joined: Feb 2000
Posts: 9,715
Likes: 27
From: Kempner Texas
Re: Converter Unlocks When Decelerating (85 Dave)
A buddy of mine has just got his 86on the road and he has a 700R4. His is occasionally dropping out of overdrive converter lockup at steady pedal highway speeds, then back into overdrive converter lockup.
He said it's annoying and has checked the fluid level, reset the cable, but still it occasionally drops out of OD converter lockup, then back in.
Not being a "tranny man" I couldn't help much. Any ideas?
Jake
[Modified by JAKE, 4:36 PM 3/15/2002]
He said it's annoying and has checked the fluid level, reset the cable, but still it occasionally drops out of OD converter lockup, then back in.
Not being a "tranny man" I couldn't help much. Any ideas?
Jake
[Modified by JAKE, 4:36 PM 3/15/2002]
Le Mans Master
Joined: Feb 2000
Posts: 9,715
Likes: 27
From: Kempner Texas
Re: Converter Unlocks When Decelerating (snaketr)
They are supposed to do that, it helps with the fuel economy.
I suspect it isn't mine because I know the converter isn't supposed to drop out of lockup then back in at steady pedal level road conditions.
It's supposed to remain locked until load becomes so heavy (like when climbing a hill) that causes it to drop out of lockup. Once the load is off, the converter is supposed to relock and remain that way. Operating like that is the most efficient and also lowers engine rpm 2 hundred or so.
Jake
Jake
Drifting
Joined: Oct 1999
Posts: 1,722
Likes: 0
From: Gloucester Va
Re: Converter Unlocks When Decelerating (JAKE)
Jake
The "they are suppose to do that" was at you I believe.
The reason is they are suppose to drop out of lockup when you let off the gas. Your trying to fix something that is not broke don't head down that road. I've been there it's not pretty.
The "they are suppose to do that" was at you I believe.
The reason is they are suppose to drop out of lockup when you let off the gas. Your trying to fix something that is not broke don't head down that road. I've been there it's not pretty.
Racer
Joined: Sep 2000
Posts: 481
Likes: 0
From: Melbourne, Florida, USA
Re: Converter Unlocks When Decelerating (85 Dave)
On the highway, when I lift off the gas but not on the brakes, the torque converter unlocks. When I ease back into the gas, the converter locks back up. I thought the converter shouldn't unlock unless the brakes are applied or the car is going slower than 35 mph. What could be causing this?
Mine does the same thing, I was told by a number of tranny guys that's what it's supposed to do :yesnod:
Rich
Team Owner
Joined: Oct 2000
Posts: 29,937
Likes: 22
St. Jude Donor '03-'04
Cruise-In 1-2-3-4-5 Veteran
Re: Converter Unlocks When Decelerating (snydcat)
Can you disable the lockup function on a '93 700R4 (non-electronic) without opening up the transmission? I've got the dreaded lock/unlock shudder and stumble, and I can't get it repaired until November, so I was wondering if there was a solenoid or switch outside the case that I could unplug to defeat the lockup until I can get it in the shop.
I know it'll cost me fuel economy, but I'll feel better and have a safer, more responsive car with the lockup disabled until I can get to the shop.
I know it'll cost me fuel economy, but I'll feel better and have a safer, more responsive car with the lockup disabled until I can get to the shop.
Le Mans Master
Joined: Feb 2000
Posts: 9,715
Likes: 27
From: Kempner Texas
Re: Converter Unlocks When Decelerating (88_vette)
Jake
The "they are suppose to do that" was at you I believe.
The reason is they are suppose to drop out of lockup when you let off the gas. Your trying to fix something that is not broke don't head down that road. I've been there it's not pretty.
The "they are suppose to do that" was at you I believe.
The reason is they are suppose to drop out of lockup when you let off the gas. Your trying to fix something that is not broke don't head down that road. I've been there it's not pretty.
So my question remains, why does his converter unlock when he is driving at a steady state (not accelerating or decelerating), not going up or down a hill?
This is NOT normal.
Jake
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Drifting
Joined: Nov 2001
Posts: 1,783
Likes: 2
From: Latham NY
Re: Converter Unlocks When Decelerating (JAKE)
The shifting out of overdrive problem can be solved by replacing the TV boot valve in the transmission. You can get it from GM and B&M also sells it. Call www.pro-built.net and describe the problem and he well send you the right parts. You may also want to put in a Transgo shift kit while your at it.
Melting Slicks
Joined: Apr 2001
Posts: 2,112
Likes: 220
From: Ca.
Re: Converter Unlocks When Decelerating (JAKE)
A buddy of mine has just got his 86on the road and he has a 700R4. His is occasionally dropping out of overdrive converter lockup at steady pedal highway speeds, then back into overdrive converter lockup.
He said it's annoying and has checked the fluid level, reset the cable, but still it occasionally drops out of OD converter lockup, then back in.
Not being a "tranny man" I couldn't help much. Any ideas?
Jake
[Modified by JAKE, 4:36 PM 3/15/2002]
He said it's annoying and has checked the fluid level, reset the cable, but still it occasionally drops out of OD converter lockup, then back in.
Not being a "tranny man" I couldn't help much. Any ideas?
Jake
[Modified by JAKE, 4:36 PM 3/15/2002]
Melting Slicks
Joined: Apr 2001
Posts: 2,112
Likes: 220
From: Ca.
Re: Converter Unlocks When Decelerating (Matt Black)
Can you disable the lockup function on a '93 700R4 (non-electronic) without opening up the transmission? I've got the dreaded lock/unlock shudder and stumble, and I can't get it repaired until November, so I was wondering if there was a solenoid or switch outside the case that I could unplug to defeat the lockup until I can get it in the shop.
I know it'll cost me fuel economy, but I'll feel better and have a safer, more responsive car with the lockup disabled until I can get to the shop.
I know it'll cost me fuel economy, but I'll feel better and have a safer, more responsive car with the lockup disabled until I can get to the shop.
