Terrano changing revs.
Submitted: Wednesday, Jan 24, 2007 at 21:54
ThreadID:
41596
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3577
Replies:
5
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6
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nasaman
The vehicle is an imported 1990 Terrano
It has 140,000 on the clock.
Has never really towed any more than a small trailer rarely.
It is a Turbo 2.7 diesel Engine TD27033604T 4X4 4 door 3 speed automatic wagon.
It usually doesn’t go into top gear until about 75 Ks/Hour
The vehicle seems to change revs a lot as if it is slipping back to second.
Sometimes I am sitting on 100Ks at 2500 revs
The next thing I am sitting on 100Ks at 3000 revs.
Sometimes It will run at 100Ks at 2300 revs
You can hear the engine change revs but sometimes the rev counter changes accordingly and mysteriously sometimes you hear like the engine change revs but the rev counter doesn’t move. I have always though it was getting to top a bit on the slow side like revving out a while in second.
Now it is like you are doing an even 100ks on a smooth road and suddenly sounds like engine revs up but rev counter doesn’t indicate this.
I really don’t know anything about these turbo charges I don’t even know how to really tell if the turbo is working or not. I paid over $100 for a manual and when I looked to that all it said was if turbo charger fails – replace. LOL.
I have checked transmission fluid and if any thing have slightly overfilled to no avail.
Any ideas would be welcome. nasa@netbay.com.au
Reply By: johannagoanna - Wednesday, Jan 24, 2007 at 23:24
Wednesday, Jan 24, 2007 at 23:24
Hey Nasa,
I can't help you, but if you log onto the Pathfinders Club
Forum, you will find all the answers you need. Quite a few Terrano guys there to help you.
The link can be found at www.pcoa.org.au
Hope this helps.
Jo
AnswerID:
217621
Follow Up By: hoyks - Thursday, Jan 25, 2007 at 22:07
Thursday, Jan 25, 2007 at 22:07
Well, 1, Me ;-) and I have no idea what it could be.
Mine is the Terrano II which is slightly different. More electronic stuff and a manual box.
FollowupID:
478253
Reply By: robak (QLD) - Thursday, Jan 25, 2007 at 09:40
Thursday, Jan 25, 2007 at 09:40
nasaman
I have a 92 terrano. I'm no expert but it sounds like your torque converter is not locking properly. You haven't got that "power" switch "on" by any chance?
I usually run (100km/h) at about 2500 revs before the converters locks and about 2100 after it locks-up.
R.
AnswerID:
217678
Follow Up By: nasaman - Monday, Jan 29, 2007 at 16:46
Monday, Jan 29, 2007 at 16:46
Thank you
I am now really convinced you were on the right track with the torque converter.
Because this morning I done a little experimenting and went down the road at 100ks and then dropped the foot down. The engine started doing 3000 revs and the Speedo was just climbing slowly.
I then tried the same thing with the HOLD –A/T –POWER button on hold and this time the engine took load and both speed and revs started climbing in accordance.
I never did understand the A/T button and was just told on purchase to leave it alone, I have come to conclude that on HOLD it locks the torque converter and on POWER it unlocks it whilst in A/T it simply lets the torque converter work automatically.
Is this correct.?
When I put it on POWER I have the same slipping problem as when in A/T position.
Most certainly on HOLD it locks the slipping and it seems to me that when in A/T the thing is still slipping a little.
I have the operator’s manual but my Japanese is not so hot. LOL
Thank you for the help so far.
FollowupID:
478803
Follow Up By: robak (QLD) - Tuesday, Jan 30, 2007 at 12:56
Tuesday, Jan 30, 2007 at 12:56
I never really understood the hold/AT/power button. On "hold" it seems to stay in gear and (like you say) with the converter locked. In "power" mode it probably never locks. I just leave on AT and sometimes on "hold" when on long highway stretches. Seems to be happy with that.
BTW - I believe the car is 3 speed + overdrvive, which is effectively 4 speed.
With the slipping problem - does it only slip when you press the accelerator? If so, I think that's what it should be doing. If, on the other hand, it is slipping at unexpected times then you should probably have it looked at.
Cheers
R.
FollowupID:
479000
Follow Up By: nasaman - Wednesday, Jan 31, 2007 at 14:02
Wednesday, Jan 31, 2007 at 14:02
Hi again Robak,
You are indeed correct it is three speed with overdrive.
I usually just leave the overdrive on permanently.
This morning called for further experimentation.
I left the A/T button on hold and away we went.
The gears still change normally so this doesn’t lock the thing in gear.
What I now believe this dose is lock the Torque converter because once I was getting along in third I planted the foot and the speed and the revs were locked together and could only adjust in accordance to one another.
Then I stuck the A/T on A/T central. Then if I slammed the foot to the floor up went the revs away ahead of the speed. Once I slapped the A/T in power same thing occurred.
I am now totally convinced that the A/T button simply locks and unlocks the Torque converter and whilst in A/T mode it allows this locking feature to be controlled by the sensor systems.
Or simply the A/T switch is a Torque converter lock unlock and auto switch.
( hold = lock ) ( A/T = automatic ) and ( power = unlocked )
Anyway at this time it appears that this manual mucking around with the thing has cured the problem.
I don’t get out much. We will see over the next trip to
Atherton.
Thanks again ………………………..Nasa.
FollowupID:
479233
Reply By: GaryInOz (Vic) - Thursday, Jan 25, 2007 at 10:49
Thursday, Jan 25, 2007 at 10:49
Left of field...
Another possibility if it is elecronically controlled injection is a bad connection to the engine temperature sensor (this is not usually the one connected to the dash temp guage). If this connection goes open or high resistance due to dirt/corrosion then the ECU senses the engine is cold, and may send a message to the transmission controller to not allow the transmission into overdrive. The transmission then gets twitchy with the good/bad/good contact being made. It will also disable the torque converter lockup, possibly giving rise to the three rpm's you get for 100 km/h. (2300 locked and OD, 2500 unlocked and OD, and 3000 unlocked and third.).
Are you SURE it is only a three speed auto (four speed would not have been uncommon, even in 1990), if not then this would DEFINITELY indicate a bad connection to the temp sender or bad sender, being one of the few items of failure that will cause this problem.
Are there any
check engine lights or codes coming from the computer that you can read or have had read?
AnswerID:
217703
Follow Up By: nasaman - Wednesday, Jan 31, 2007 at 14:13
Wednesday, Jan 31, 2007 at 14:13
Hi GaryInOz,
Thanks for the response,
You also hit the nail on the head with looking towards the torque converter lockup.
I appreciate the good advice.
You also mentioned the engine temperature sensor and you will see by the posts immediately above this one that this is the direction I will be heading.
You also said (this is not usually the one connected to the dash temp gauge).
I have had a brief look and I wonder if you have any further idea where this sensor is located.
My great $100 manual doesn’t show any of this, and my Japanese is no better now than it was last week.
Thanks to all ……Nasa.
FollowupID:
479235
Follow Up By: GaryInOz (Vic) - Wednesday, Jan 31, 2007 at 17:18
Wednesday, Jan 31, 2007 at 17:18
Sorry, but I don't know exactly where it is, but it would be near the thermostat cover and waterpump area (actually on the thermostat housing?)
I'm guessing you would see two sensors, one for the temp guage and one for the ECU, again, a guess that the ECU one will have two wires coming out of it whereas the temp guage will only have one.
I don't own a Terrano, but my Kia Sportage model also has similar issues related to similar problems.
FollowupID:
479271
Reply By: SantaAus - Thursday, Jan 25, 2007 at 21:41
Thursday, Jan 25, 2007 at 21:41
Try this website as
well. 4x4parts.com
This is the american website for the Pathfinder./ They should be able to help you with the gearbox side of things.
SantaAus
AnswerID:
217828
Reply By: nasaman - Sunday, Jan 28, 2007 at 22:46
Sunday, Jan 28, 2007 at 22:46
Thanks so far guys.
You have given me a new clue.
What I did do was cruise along at about a hundred and slammed her back into second just for the experience.
Well that taught me one thing you will know about it if they drop back to second so that counts that out it is not that severe.
I also noticed that when cruising along at about 80 you drop the foot down and immediately the rev counter goes up to about 3000 revs but the speed just slowly begins to clime.
I checked the A/T power switch I have always run this in the neutral position.
The cleaning fairy had not changed it.
I really don’t think the torque converter is locking up properly.
I have come to believe that is properly where the problem is.
I will have another play tomorrow.
Thanks for the clues.
AnswerID:
218268