39 replies to this topic

[MRLXSS]

I'm no expert, but things you could check are.

Vacuum lines are all connected and not leaking (The ones from the manifold to the modulator on the Tranny.

And also that your Filter in your Trans isnt clogged up with shit (its about $15-20, for a kit that you can fit yourself and give the box a service)

They are two issues i have had with Trimatics previously that had similar gear changing issues...

[MRLXSS]

I got mine from supercheap, but Autobahn or anywhere like that will have it, its the same kit for a V8 and a 6

[LX2DR]

Mine did exactly the same thing a while ago.

Was the vac line to the modulator, was off at the modulator on the back off the trans.

Could also be the fitting on the manifold where the vac line comes out for the modulator, that fitting has a tiny hole in it and it could be blocked with crap.

The kickdown switch is basicaly self adjusting, grab the lever on the side of the switch, give it a good push towards the front of the car this releases it.
When you push the accelerator to the floor is lifts it to the highest possition and that sets it.

Edited by LX2DR, 05 March 2008 - 08:15 PM.

[LX2DR]

I'm completey confused now?

Mine has started doing a similar strange thing

After it has been running for about 20 minutes, for no reason it shifts down to 2nd and will only shift up again if i push into it to go faster, the moment you alow it to cruise again (as you have to at the speed limit) it shifts down again.

The real problem for me is, i recently put a new filter and all seals through it before i fitted it to the hatch.

I have done all the above checks and its still doing it

The next thing i will do is replace the modulator itself.

Its a real pain, this is the 120k tranny i just put in the car and looked perfect when i had it open, so now i'm scratching my head?

Seems like it has to be something sticking as it only does it while hot, although it doesnt make sense why it starts to do it when you are cruising on a flat road?

[TerrA LX]

Sounds like the modulator to me.

[mr5000]

i have the answer to all your problems its a traumatic

[LX2DR]

Yes, let's all convert to 4 speed Lenco's.

Maybe they will give a 50% trade-in or 50% discount to finally get them of the road

Also to help put us out of our long suffering misery

Edited by LX2DR, 24 March 2008 - 02:27 PM.

[surfmaster]

You could be losing oil pressure somewhere in the system, the governor could be sticking or a valve sticking in the valve body. (Assuming you have eliminated ALL vacuum leaks).

[makka]

this may sound funny but its possible that water may be getting into the tranny through the radiator mounted oil cooler, I have seen it happen before and it caused similar things to happen except 3rd wouldnt engage till around 120kmh

[surfmaster]

Keeping the tranny fluid cool keeps it "thicker" and therefore it will seal and work better under some conditions. If you have to keep it cool for the transmission to operate properly there is an underlying problem which needs rectification.

Trimatics 101:

All vacuum leaks must be eliminated. This includes the modulator line from the the manifold to the modulator (which must be tight), the inlet manifold must be tight and sealed, (check the rearmost bolts/nut - very important).

Oil level must be right, (warm it up, run through all the gears and check in park with the engine running).

Band must be adjusted correctly - this is a slightly technical job involving removal of the auto sump, band servo housing and correct adjustment of the band itself (up 40 inch pounds and back off four turns for older boxes, five for later emission boxes)

There are a number of areas which can cause low pressure in a trimatic, worn pump bush, worn seals in 2nd, 3rd and reverse clutches, worn reverse clutch plates which fall in the sump and block the oil filter, worn oil pump or worn oil pump seals. Sometimes a 2nd hand good replacement box is a cheaper option.

[LX2DR]

I have fitted a trans cooler, the 1st test drive was long enough for the fault to normally start happening and it didn't do it, hopefully it will behave till it's next service and will see if the problem can be found and fixed properly.

[LX2DR]

I have fitted a trans cooler, the 1st test drive was long enough for the fault to normally start happening and it didn't do it,    hopefully it will behave till it's next service and will see if the problem can be found and fixed properly.

Damn it hasn't fixed it or helped it, bugger.

Rang the local Auto Trans place and booked it in.

Started to tell him what it was doing and he finished telling the rest of the story, knew exactly what was happening .

Asked about how much to fix, $140, full service, adjust band and fit a new kickdown solenoid.

Obviously thats what is wrong, he said must still have the original kickdown solenoid as they had a habit of warping.

Even though i now know, what needs to be replaced i will still get him to do the job, it's the right thing to do.

Everybody else can benefit.

I'll keep you informed if it is fixed.

[rodomo]

Ahhhhh, so I was on the right track?
Just on the wrong tram

[LX2DR]

Ahhhhh, so I was on the right track?
Just on the wrong tram

Yep

[rodomo]

I have fitted a trans cooler, the 1st test drive was long enough for the fault to normally start happening and it didn't do it, hopefully it will behave till it's next service and will see if the problem can be found and fixed properly.

You'll need this at Winton anyway

[LX2DR]

OK, the service was done at Eltham Automatics (BBE Auto P/L)

The culprit


The problem




The body is warped and gets worse when heated, the fluid starts to pass and down shifts.

Turns out the owner has an LX Torrie sedan that he's building, so i invited him to the site and mentioned the prefered supplier forum, to which he said he would have a look?