A340E question

[Kckazdude]

Have been fighting with my transmission shift points since I got this car. After getting the TPS cleaned and properly set the shift points at part throttle are right were they should be. Downshifts into proper gears and all. Have locked the line pressure adjustment open for a firmer shift. When cold the car will not shift out of 1st until I get to at least 4500 RPM. After 2 shifts,it shifts as it should. At WOT the 1/2 shift is horrible. It will pull all the way to 6500 RPM then delay the shift for almost 2 seconds. Right now it is actually a better shift is I let off the accelerator and get back into it at 5800-6000 RPM. This still gets me a 'soft' shift. What am I missing to get the WOT shift firm?

 

[IJ.]

There is a temp input that won't let it lock the convertor ubtil 60c from memory.

Locking the line pressure cable is one of the stupidest things you can do to a 340...... the whole idea of it is so you have soft shifts at part throttle and firm shifts at full throttle (I really don't get how this ever came to be "a good idea")

You need to shim the accumulators for firm shifts mucking around with external things won't do it.

 

[MDCmotorsports]

Not to thread jack, but my a341e shifts very "delayed" and not positive at all out of first, no matter the throttle position.

Ive changed the shit solenoids and it still does the same thing.

Any ideas guys?

 

[IJ.]

Jon: Shift kit and shim the accumulators.
(Just fitted a kitted 341 valve body to my 340)

 

[wiseco7mgt]

Jon: Shift kit and shim the accumulators.
(Just fitted a kitted 341 valve body to my 340)

where'd you get that Ij?how much?

 

[IJ.]

Wis: MV Automatics in South Australia, can't remember what I paid for it Michael did it as a bit of a service as I needed the 341 VB to replace my kitted 340 one as I lost the Line Pressure cable when I went DBW.
(I have the 340 1.5 shift kitted body here if you're interested)

 

[Kckazdude]

I understand the temprature and convertor lock up. Not an issue at all for me. The trans literally will not shift out of 1st gear until after 4500 RPM until it goes through 2 shift cycles. Once it goes through 2 cycles it will shift depending on throttle position as it is supposed to.

Got the idea to lock the line pressure open from the thread over on SF that discusses the accumalator shimming. Just havent gotten brave enough to drop my valve body out and actually shim them.

 

[IJ.]

Try running it with the cable back to stock and see how it behaves?

 

[Kckazdude]

The cable adjustment made no difference in shift points. All the cable did was give it firmer feel. Didnt change the shift points at all. The TPS did correct many of my shifting problems that I was having. The cold shift point thing just wont go away as well as the delyed WOT 1/2 shift.

 

[IJ.]

The cable increases line pressure and that WILL change shift points....

There may be enough residual pressure at low throttle/tps settings to hang a clutch pack and not let it release the gear it's in.

 

[Kckazdude]

I have expirienced the condition you are refering to but it was a constant thing on the vehicle. This only happens when the car is coming from a cold start. It has been a problem ever since I got the car. Was doing it before I started adjusting the cable. Locking the cable out had no affect on the cold 1/2 shift.

 

[TurboStreetCar]

I have expirienced the condition you are refering to but it was a constant thing on the vehicle. This only happens when the car is coming from a cold start. It has been a problem ever since I got the car. Was doing it before I started adjusting the cable. Locking the cable out had no affect on the cold 1/2 shift.

the fluid is cold making it thicker making more pressure witch could cause issues, unlock the throttle cable and put it back to stock. its pointless to have it locked full.

Ive changed the shit solenoids and it still does the same thing.

Sounds like a smelly job.....

 

[dbsupra90]

you sure the fluid is full? if mine is just a fuzz low i can feel the difference.

be sure you do the gear select and engine warm and running for the fluid check.

have you checked for tranny codes at all? does your speedo work?

 

[Kckazdude]

Speedo works, no codes present and fluid at normal level and bright color.

When I first go tthe car it wouldnt hold 1 gear very long. Would usually shift at 10-15 MPH if not WOT. All shifts were as firm as those of an Avalon. Also would not downshift except for out of OD into 3rd. Had the same problem of not shifting out of 1st until 4500 RPM or later when cold.

So far I have replaced the trans filter and did 3 drain and fills on the trans fluid. Flushed trans cooler and lines. Clean and adjust TPS. Replaced ground wires and cleaned contact areas where needed to trans and engine. After all of this is when I locked the LP cable out all the way.

I did unlock it and set it to the TB linkage tonite after work. The shifts arent as firm. The shift points also seem to be 300-500 RPM sooner. Still have the WOT 1/2 shift delay. Still have the cold shift problem.

 

[wiseco7mgt]

i hate to ask a silly question but have you borrowed a mates ECT and tried that?please forgive me if youve mentioned that idea already, its a sunday arvo and im Quite drunk ....

 

[Kckazdude]

Have not tried a known good ECT. The thought has crossed the back of my mind. I feel like the problem lies in the valve body itself. I am afraid it will have to be removed from the vehicle to actually fix the problem. I am just really hoping that isnt case.

 

[dbsupra90]

another thing i would check is Tt to ground (E1).

with a volt meter, check that the voltage is going from 0v -5v in steps as you increase throttle position. you can do this with the car not running, just have it turned on. if this isnt working correctly, it will have a huge effect on shifting.