Extreme Terrain
4x4Wire Trail Talk Forums: Jeep, Toyota, Mitsubishi, Pajero, Isuzu, Kia, 4WD, 4x4, SUV, Off-Road and OutdoorWire Forums


Search

Recent Posts on TrailTalk
1990 Gen 1 steering gear box leak
by Mudflap - 03/01/21 01:24 AM
'87 2.6l running rough - seems electrical
by Lev_from_CA - 02/28/21 10:11 PM
Replacement MAF unit .. Gen1
by rxinhed - 02/25/21 03:16 AM
Gen1 cigarette lighter port.
by rxinhed - 02/25/21 03:15 AM
Support 4x4Wire
New Topics on TrailTalk
Gen1 cigarette lighter port.
by Trailmonkey - 02/19/21 01:34 AM
1990 Gen 1 steering gear box leak
by nvmonty - 02/18/21 06:42 AM
Need source for 89 v6 EGR Pipe Gasket
by polar - 02/16/21 03:03 AM
4x4 Gallery
Photos of rig
Attila
99 Monterrible Sport
Scar the Cylon Raider
Mercenary Sergeant: Code Name "Sapphire"
More News on the 'Wire

4x4Voice
4x4Wire
MUIRNet-News
OutdoorWire
Who's Online Now
0 registered members (), 97 guests, and 3 spiders.
Key: Admin, Global Mod, Mod
Forum Statistics
Forums37
Topics138,179
Posts1,081,008
Members15,161
Most Online907
Dec 28th, 2019
Previous Thread
Next Thread
Print Thread
Rate Thread
Torque converter/transmission problem, 2004 Sport #1103581 07/01/17 02:25 AM
Joined: Jun 2001
Posts: 1,452
J
Jim_B Offline OP
Body Damage is Cool
My wife has a 2004 Montero Sport that's experiencing a problem with the torque converter and/or transmission. When driven at steady throttle from about 25-45 miles per hour, it feels like it's constantly shifting in between gears. I *think* (NOT 100% sure) it may be a failed torque converter locking and unlocking. The transmission fluid is the correct fluid (from the dealer, Diamondstar (??), IIRC) and it's clean. (I've changed it about three times in the last two years.) Aside from having a failing torque converter, the only other issues I can think of would be: A) bad input/output speed sensors on the trans.; B) bad transmission control module; C) restricted trans filter.

Has anyone experienced a similar problem? I think Mitsubishi had TC problems around that timeframe, both in SUVs and cars. I'm leaning toward replacing the converter, but I'd like to do a little research before I go down that road.

Any/all help is much-appreciated! grin

-Jim

Support our sponsors
Re: Torque converter/transmission problem, 2004 Sport [Re: Jim_B] #1103582 07/01/17 04:07 PM
Joined: Mar 2005
Posts: 1,006
P
pcc Offline
Body Damage is Cool
Add to your list of possibles is ECT (engine coolant temp) sensor. It won't allow trans to shift to OD until engine warms up. Your heat gauge will look normal but the sensor may be off spec. Have you been Having any drivability symptoms other than trans?

You can test the ECT on the engine. Test resistance cold then with hot engine and see if within spec. My 92 specs are 2.37 +- .24 K ohms at 68F and 290 +- 32 K ohms at 176F. Yours will probably be the same as these are usually standard thermistors.


92 Montero LS 3.0L V6 Auto, Stock, Original owner, 185,800K miles
Re: Torque converter/transmission problem, 2004 Sport [Re: pcc] #1103583 07/02/17 04:52 AM
Joined: Jun 2001
Posts: 1,452
J
Jim_B Offline OP
Body Damage is Cool
Originally Posted by pcc
Have you been Having any drivability symptoms other than trans?

No, just the converter and/or transmission acting weird. At steady throttle the problem is the worst. Getting on the gas seems to temporarily alleviate the problem.

Re: Torque converter/transmission problem, 2004 Sport [Re: Jim_B] #1103584 07/03/17 11:22 AM
Joined: Mar 2005
Posts: 1,006
P
pcc Offline
Body Damage is Cool
The other possible is the TPS. It is part of the computer input for shift points. I'd inspect it's adjustment. On your 2004 there may also be a vacuum hose that transmits engine load info to computer.

Also I guess you've checked your trans fluid level.

Last edited by pcc; 07/03/17 11:22 AM.

92 Montero LS 3.0L V6 Auto, Stock, Original owner, 185,800K miles
Re: Torque converter/transmission problem, 2004 Sport [Re: pcc] #1103586 07/04/17 05:48 PM
Joined: Jun 2001
Posts: 1,452
J
Jim_B Offline OP
Body Damage is Cool
Originally Posted by pcc
On your 2004 there may also be a vacuum hose that transmits engine load info to computer.

Also I guess you've checked your trans fluid level.

Yep, the fluid level is correct, it's clean, and the proper Mitsubishi brand fluid. (Purchased at the Mitsubishi dealer).

Can you elaborate on the vacuum hose? (If you could let me know where it's located so I can have a look at it, that would be great.)

Last edited by Jim_B; 07/04/17 05:49 PM.
Re: Torque converter/transmission problem, 2004 Sport [Re: Jim_B] #1103587 07/04/17 10:04 PM
Joined: Mar 2005
Posts: 1,006
P
pcc Offline
Body Damage is Cool
I don't know if your 04 has one - just putting that out as a possible to research. Maybe someone else here can help.

Do you have any manuals?


92 Montero LS 3.0L V6 Auto, Stock, Original owner, 185,800K miles
Re: Torque converter/transmission problem, 2004 Sport [Re: Jim_B] #1103591 07/09/17 07:23 AM
Joined: Jun 2001
Posts: 1,452
J
Jim_B Offline OP
Body Damage is Cool
Well, I think I've inadvertently fixed the problem. It had also started to misfire at stop lights when the air conditioning was running. I was pretty sure the plugs and wires had never been changed, so I went ahead and swapped in some new ones. It not only fixed the misfire when stopped at a light, but it fixed the weird shifting, as well. I'm at kind of a loss to explain why it even fixed the problem. The only (admittedly non-technical) explanation I can come up with is that the misfiring plug was confusing the electronic controls. (One of the plug wire boots was bad and the electricity was traveling down the outside of the ceramic of the spark plug.) In any event, it's been several days now and it does appear that changing the plugs and wires fixed the problem.

Thanks for the responses, pcc!

Re: Torque converter/transmission problem, 2004 Sport [Re: Jim_B] #1103592 07/09/17 08:51 PM
Joined: Mar 2005
Posts: 1,006
P
pcc Offline
Body Damage is Cool
Originally Posted by Jim_B
Well, I think I've inadvertently fixed the problem.


That makes sense. The computer is monitoring load. If the engine's missing then the it will require a lower gear to handle perceived load. My suggestions, were a stab at getting to the parts that measured load - which would allow shift to OD or not OD.

Glad you got it fixed without an expensive looky-see at the torque converter.


92 Montero LS 3.0L V6 Auto, Stock, Original owner, 185,800K miles







4x4Wire Social:

| 4x4Wire on FaceBook |


OutdoorWire, 4x4Wire, JeepWire, TrailTalk, MUIRNet-News, and 4x4Voice are all trademarks and publications of OutdoorWire, Inc. and MUIRNet Consulting.
Copyright (c) 1999-2019 OutdoorWire, Inc and MUIRNet Consulting - All Rights Reserved, no part of this publication may be reproduced in any form without express written permission
You may link freely to this site, but no further use is allowed without the express written permission of the owner of this material.
All corporate trademarks are the property of their respective owners.

Powered by UBB.threads™ PHP Forum Software 7.7.3
(Release build 20190728)
PHP: 7.2.34 Page Time: 0.031s Queries: 15 (0.008s) Memory: 2.8558 MB (Peak: 3.1632 MB) Data Comp: Off Server Time: 2021-03-01 17:14:35 UTC
Valid HTML 5 and Valid CSS