Shifting Problem

[GT_Hatchback]

ok so basically my transmission has a mind of its own. its an automatic gs (nothing special just a dd) and for about 2 weeks now the transmission has been acting up. It will wind out gears to just about 4500-5000 rpms and then shift...half the time when I left off of it to let it shift it still doesnt...it will have to wind way down to shift..........another problem is that when I'm driving at a normal pace it will automatically downshift for no apparent reason...I was thinking the tranny just needs flushed and a new filter but the fluid looks good on the dipstick....I'm going to change it here in the next couple of days....this is getting really annoying so I hope you guys can give me some advice...if I cant do anything I'll just do a 5 spd swap (yeah right)

 

[Locke]

Any codes?

I'd suspect the speed sensors (or their wiring) or the TCU.

 

[GT_Hatchback]

yeah I'm throwing a code as we speak...but I was told it comes up as EGR ( which is probably due to the fact that I accidentally broke off the valve) but no other codes...I was just thinking that a new fluid and filter change would do it but I guess not...By the Way I was told it has a manual computer in it...dont know if that would contribute to the problem or not

 

[heckles]

Ive seen similar problems with my neon, It ended up being a seized downshift lever on the tranny. I disconnected it from the cable, cleaned it, lubed it (antiseize) and that fixed it.

 

[GT_Hatchback]

you think that could be it?? if you dont mind how would I go about doing that??

 

[96mitsugsx]

I was just talking to a friend of mine who used to be a mechanic at a Mitsu dealership and he said the automatic trannys on those are weak. He said he used to rebuild those all the time. But try flushing your tranny before anything else.

 

[GT_Hatchback]

hmm...I guess I'm just going to flush it out and see what that does

 

[Laysher91]

Originally Posted by Locke
Any codes?

I'd suspect the speed sensors (or their wiring) or the TCU.

yeah I'm throwing a code as we speak...but I was told it comes up as EGR ( which is probably due to the fact that I accidentally broke off the valve) but no other codes...I was just thinking that a new fluid and filter change would do it but I guess not...By the Way I was told it has a manual computer in it...dont know if that would contribute to the problem or not

I believe Locke was talking transmission codes and not engine codes. Check this out for pulling auto transmission codes:

TCU Codes

 

[Locke]

I was, but on the 2gnt, the ECU communicates with the TCU via the CAN bus. If TCU fault codes are present, the ECU will dump code P0700.

 

[GT_Hatchback]

so its not something wrong electrically?? as in a sensor or something??

 

[Locke]

It could very well be, if a sensors output is still within operating range, it won't throw a code. It may be very off, though, and still within range.