torque convertor lock up

Submitted: Wednesday, Jan 08, 2014 at 10:07
ThreadID: 105728 Views:1528 Replies:6 FollowUps:5
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A little hep needed please. My 1998 100 # LC 4.2 turbo diesel has a problem when cold. When first driven in the morning when you stop for the first time the engine attempts to stall this I am told is caused by the converter lock up not releasing. any ideas as to how to fix this
Thanks
Kiwi ray
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Reply By: Brian 01 - Wednesday, Jan 08, 2014 at 10:19

Wednesday, Jan 08, 2014 at 10:19
An auto transmission specialist would be my choice.
AnswerID: 524085

Reply By: Kiwi Ray - Wednesday, Jan 08, 2014 at 10:21

Wednesday, Jan 08, 2014 at 10:21
Sorry missed this bit. This only happens once or twice as the tryck warms up.
Thanks
Ray
AnswerID: 524086

Follow Up By: pop2jocem - Wednesday, Jan 08, 2014 at 10:41

Wednesday, Jan 08, 2014 at 10:41
As Brian said, transmission spucialist. How long since the tranny oil has been changed?

Cheers
Pop
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FollowupID: 805672

Reply By: Kiwi Ray - Wednesday, Jan 08, 2014 at 10:52

Wednesday, Jan 08, 2014 at 10:52
Hi
The truck has only done 82,000ks.
Oil changed 30,000 ago
This truck does not do a lot of work and only tows a light trailer
Are you suggesting that an old oil could cause this problem
Ray
AnswerID: 524089

Follow Up By: pop2jocem - Wednesday, Jan 08, 2014 at 11:13

Wednesday, Jan 08, 2014 at 11:13
Yep, the truck is what 16 years old and only done 82,000 k's. Sounds like either your odometer is a bit sus or it has done a lot of sitting around and maybe moisture in the transmission fluid has gummed up something. Try changing the oil and have a good look at the suction screen. That maybe all it needs. If that doesn't do any good take it to a transmission mob.

Cheers
Pop
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FollowupID: 805674

Reply By: Member - Bruce C (NSW) - Wednesday, Jan 08, 2014 at 11:52

Wednesday, Jan 08, 2014 at 11:52
Hi Ray,
This is not an uncommon problem with the cruiser autos and seem to be mainly in the turbo diesels.

I had the same problem with the 96 turbo cruiser I had.
The torque converter refuses to disengage at low RPM.

You are right in that it is the torque converter issue. It is possible to live with it for some time if you are prepared to put up with it.

Mine used to stall in reverse when reversing down a driveway. Not something I often did but enough to be annoying.

I don't think it is a simple fix for the layman and may require a reconditioned torque converter.

This means a trip to an automatic specialist unfortunately.

Cheers, Bruce.
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restless and lost on a track that I know. HL.

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AnswerID: 524090

Follow Up By: Ross M - Wednesday, Jan 08, 2014 at 17:00

Wednesday, Jan 08, 2014 at 17:00
The only thing that holds a torque converter clutch ON is hydraulic pressure.
The fluid may be the wrong fluid or the valving is sludgy or sticking and although the solenoid releases the pressure actuating the spool valve to turn it on is sticking.
IMHO very unlikely to be the actual clutch itself and very likely to be fluid quality, viscosity when cold, or some gumming of the controlling spool valve.

Until you get up to a reasonable speed the clutch should never be actuated and especially just after starting and reversing etc.
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FollowupID: 805684

Follow Up By: Nomadic Navara - Thursday, Jan 09, 2014 at 00:01

Thursday, Jan 09, 2014 at 00:01
Not sure about Toyotas but all the other autos I have driven do not lock the converter in the lower gears. They also do not lock the converters in the higher gears until the fluid warms up.

If the converter is locking it sounds like there is a mechanical problem in it somewhere.

PeterD
Retired radio and electronics technician

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FollowupID: 805712

Reply By: Member - mechpete - Wednesday, Jan 08, 2014 at 19:30

Wednesday, Jan 08, 2014 at 19:30
take it to an auto trans man an get himto fix it
end of story !!
mechpete
AnswerID: 524107

Reply By: Kiwi Ray - Wednesday, Jan 08, 2014 at 19:39

Wednesday, Jan 08, 2014 at 19:39
Hi Folks
Many thanks to those who replied
Toyota in NZ do not recognise this problemtheir solution is to just fit a new box.
It is good to actually hear from a person that has the same problem.
This truck sat in a storage unit for 13 years.
I have booked the truck in for tomorrow for oil and filter change and also flush the converter, so we will see if that makes a diference.
thanks for your help I will let you know hoh it goes
Ray
AnswerID: 524108

Follow Up By: Ross M - Wednesday, Jan 08, 2014 at 20:28

Wednesday, Jan 08, 2014 at 20:28
Kiwi Ray
Before it gets a fluid replacement. Take it for a run where the fluid WILL get hot and WILL lockup and unlock the clutch as many times as you can. That should begin to shift deposits and any sludging.

That is so the fluid flushes repeatedly through the troubled area with some frequency and likely to move something.

Any person draining a transmission and and not also dropping a hose off and allowing the usual torque conv. return flow to be dumped and therefore POSITIVELY changing the dirty fluid in the converter is not really doing the full flushout.

The torque converter contains, as much as or more than, the transmission itself, so when the trans is refilled the hose should still be off and engine run until it bubbles and then refilled again and run until it bubbles OR the fluid runs clean and new.
This HAS to be done repeatedly until it is clean. Then the hose put on and the proper fill then done and checked.

Nearly ALL service places DO NOT fully flush a transmission.
Expect it to use at least 15 litre for the flush if done properly. If it doesn't it hasn't really achieved anything.

Cheers
Ross M
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FollowupID: 805699

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