Hi Guys,
as some of you know I have been having problems with the carby but that's all sorted now.
When I was having the problems though I had to hit the throttle hard to get the revs down and when I did the the transmission started to jump into natural, which it never did before I had the carby problems.

The only problem it is still doing it particularly if you kick it down or under fast acceleration. It goes back into gear when you get back down under 50 km. A real pain if you are passing!!!:eek2:
Any ideas guys?
cheers, Robbie

have you checked the colour and level of the fluid .

Yes, it seems quite full and clearish in colour. Checked while engine is running and when stopped.

Just to clarify, does the T bar actually jump into the neutral position or do you just lose all drive and regain it when you slow down? You must have to back off the accelerator quickly to stop the engine over-revving.

I had a similar problem with my fiirst Magna, a TM that I bought new. It would only happen if I went through tight left and right turns in quick succession such as going through a roundabout at speed. I'd lose all drive on exit from the roundabout and the engine would go up the scale. It was quite dangerous if other cars were close behind. I think the g forces caused the transmission oil to move to the side. I have never experienced anything similar in a TP, so perhaps the TM didn't have a good baffle system.

I only realised a week ago that I previously misunderstood where the oil level is supposed to be. I thought when hot it had to be between the cold and hot marks on the dipstick. In fact, it is supposed to be between the marks on either side of the word "HOT" on the dipstick. So I had been under-filling mine.

To check the oil level, drive the car until the trans is warmed up, then stop and put trans in neutral. Engage the handbrake and hold down the brake pedal while putting the transmission in each gear and then back into neutral. Then check the level.

T bar doesn't move, It just looses all drive and regain it when I slow down and yes revs go through the roof!! It's never done this before and just started the other day. We had a V3000 magna that used to do this but only in overdrive but the TP does it whether it's in overdrive or not. It was warm when I checked and I had just come back from a run into town, which is 26 km.

The transmission has a self-diagnosis facility that stores error codes you can read using a multi-meter. The diagnosis plug is above but inside the glovebox. More about that later. I will be checking mine tomorrow so will refresh my memory before commenting further.

I've been reading the fault diagnosis chart and the nearest symptom to what you described is "sudden engine rpm increase during upshift".

The manual says the priority items to check for this are:
12. line pressure too low (seal damaged, leakage, looseness etc.).
22. Malfunction of TPS or improper adjustment.

Other causes to check:
10. Worn inside diameter of front clutch retainer.
13. Malfunction of valve body (sticking valve, working cavity, adjustment etc.)
14. Malfunction of front clutch or piston.
16. Malfunction of kickdown band or piston.
17. Improper adjustment of kickdown servo.
23. Pulse generator (A) damaged or disconnected wiring or short-circuit.
27. Malfunction of ignition system signal.
30. Pressure control solenoid valve damaged or disconnected wiring (valve open).
36. Malfunction of Transmission control unit (TCU).

As your problem seems related to the carburettor problem, the first thing I'd check is proper adjustment and operation of the TPS (throttle position sensor) - i.e. item 22 above.

We had a V3000 magna that used to do this but only in overdrive but the TP does it whether it's in overdrive or not.

V3000 in overdrive was the overdrive clutch on the way out.
The TP is the other clutch packs probably on the way out i think also as had a TN that started to do the same under hi power in 2nd. Slips like crazy and revs high and when you back off you can just get some drive. Slowly gets worse and eventually you get no drive at all. Auto tech said that was what was happening. I put another tranny in soon after diagnosis.
Get an auto specialist to road test the car they will soon tell you. Vee

It's not slipping, it's jumping out of gear and you can feel it go back in when you slow down.
We had an 86 Magna sedan manual when we lived in Perth that started loosing all gears when cruising in top gear and you had to come to a total stop and put it in first a it was fine. In the end it lost all gears.
The problem was part of the electrics in the top of the gear box. A simple fix that cost around $300 from memory.
I think what the TP is doing seems very similar but in this case it's an automatic.

You said it happens whether in overdrive or not. Does it happen when overdrive is off completely? Just trying to establish whether it only occurs when the 3 to 4 upshift is about to take place. If so, magna _buff's info post here may be relevant: http://www.aussiemagna.com/forums/showthread.php?t=40090&page=2 (see post #19). It is worth reading anyway, as are the links he provided.

Robbie it probably is still in gear but the clutch slips dramtically so you think you are not in gear. ie: neutral
I had a Nissan cefiro in Nz 2 years ago and it did the exact same thing. It would just suddenly rev to redline when you accelerated too much.
If you back off enough you can just feel it start to drive again as the clutch starts to grab again as the revs come off.
The Cefiro was not old age High Km but previous owner ran it low on fluid......recipe for disaster!!
As i said drop in to an auto repair/service place and most will road test for nothing and give you an idea what they think is the problem. Vee

Sorry for the slow reply Guys, been away for couple of days. Just taken it for a ride and It's only the over drive. If I drive with the overdrive turned off it's fine and kicks down as it should and doesn't slip or jump out of gear.
If I put the over drive on it just jumps out, doesn't seem like its slipping to me, just no gear!!

Thanks for the link Coldamus, very informative. The problem might be the TCU unit.
Cheers,
Robbie

Had a TS V6 that did that, I needed to get the revs up in third, hit about 80 kph, then lift off the throttle and engage overdrive. It would then find fourth.
Worse when cold, ok when hot - in fact I only needed to lock out overdrive for the first few km in the morning.

Try doing it that way.

More likely to be the clutch pack than the TCU.

More likely to be the clutch pack than the TCU.

I agree with that. At least it can be repaired without having to remove the trans. from the car.

In the first gens it is the overdrive clutch, it is simply not in any gear. They are not too hard to replace with the box in the car just make sure everything is spotless

Thanks guys, is there info on the forum for this job?

Thanks guys, is there info on the forum for this job?

yes, somewhere.

Found it!

Hi Guys, Is this clutch only for the overdrive?

Hi Guys, Is this clutch only for the overdrive?

I'm not sure which post you are referring to. Did you read this article that magna-buff linked to? http://www.mirage-performance.com/sonata/Transmission/endclutch.html If so, yes that is just for the overdrive.

If that seems too difficult and you can find a trans with a good overdrive, you could just swap its overdrive into yours. Apparently that is very easy, according to this post: http://www.aussiemagna.com/forums/showthread.php?t=81704&highlight=overdrive

Incidentally, if you don't have a workshop manual, you can download the 2nd Gen one here: http://ipfreelyproxies.net/mynannashotpants/TR-TS,KR-KS Workshop Manual 1995 OCR.pdf

(about 48 megabytes)

The transmission in 2.6 litre 2nd gens is the F4A-23 (also known as KM 177-6), same as the TP. There's also a lot of info re the carby and engine that is common to both 1st and 2nd gens. Nobody has uploaded a TP service manual yet.

Yes and thanks for all the info Coldamus.

filter


filter may be clogged

on a tp gearbox i once found
the cluster gear may be stripped not giving reliable drive

the symptom is it will drive till hot then just go nowhere

when cool again it will drive for a short distance

There's also a lot of info re the carby and engine that is common to both 1st and 2nd gens. Nobody has uploaded a TP service manual yet.

You can use a Tr Ts manual for most of it.
Not too much changed with the 4cyl motor core itself. Just roller rockers and the ratchet adjusters on the cam and balance chains but these were on the very last of the TP models as well. They redesigned the intake plenum and remapped the ECU to go with bigger fuel injectors and increased fuel rail pressure to get another few kilowatts out of the 2.6 motor up from 93 to 98 on ulp i belive it was. Carby for the basic models were the same and still had the 83kw.Vee

Hi Guys, is this the seal kit I need to do the job?
http://au.picclick.com/MITSUBISHI-MAGNA-AUTOMATIC-TRANSMISSION-AUTO-TRANS-TN-TM-121151408050.html

Pretty certain that's it but magna buff would know for sure. If he doesn't answer here, perhaps send him a private message.

thats just the seals for the overdrive/fourth gear

only worry about that if the overdrive revs as if in neutral

try dropping the pan and fit a new filter and gasket

the pan has magnets and you can tell if the box has other problems

not around anymore
thats true i dont use this forum much anymore because there are so few first gen members left