problem unknown

[Petersho1]

There is the story, I'm driving 70 mph-2600rpm, in 1 sec engine goes to 3000rpm, after a ~3min engine slowly goes back to 2600rpm, after 10-15min the same think.I did not do anythink.It happen first time just after temps fall below 32 F
Sho 94ATX stock
Thank you!

 

[Ishodu]

I dont know much about the ATX. But were you loosing over drive? Did you try shutting it off when this happened to see if there was any change?

 

[DubbaDooz]

you didn't have your defogger on, did you?

 

[SHOZ123]

When the Gen 3s do this it is the TC locking and unlocking because the A/C compressor is on. Try running in either just the vent or floor positions and see if it stops doing that.

 

[Petersho1]

A/C off,def. off,all off,OD off engine goes 500rpm up,so trrany is fine I hope so.Maybe some sensor.

 

[SolidState]

That was the first symptoms of my transmission failure...it was either the OD bands slipping, orthe torque converter failing....

 

[Petersho1]

I'm getting scared.At the moment when this start I feel a little jolt, like changing gear,but why O/D button works?I mean rpm goes up and down as I push the button. What is the defference betwen 3rd and 4th gear in rpm, mayby I'm loosing the 4th gear?

 

[DHMag]

Petersho1:
I'm getting scared.At the moment when this start I feel a little jolt, like changing gear,but why O/D button works?I mean rpm goes up and down as I push the button. What is the defference betwen 3rd and 4th gear in rpm, mayby I'm loosing the 4th gear?

if the bands are slipping, here is something you might look into. but first a warning...i have never done this, only been told about it, so if you choose to do it, i am not to be held liable for any mishappenings. ok, with that said, ive heard that could could pour a capful of brake fluid into the tranny fluid. something causes it to make the bands sticky, hence, curing the slipping gears.

 

[projectSHO89]

Run the KOEO and KOER diagnostic tests.

You didn't mention if you had a CEL in conjuction with the change in engine speed.

My old 93 Explorer exhibited the same symptom (changing engine speed while at constant speed, TC locking/unlocking, etc) a long time ago, it turned out to be a bad TPS (Throttle Position Sensor). The transmission lasted another 70K miles until a newer, heavier boat took its toll on the tranny.

Maybe you will get lucky and the TPS will be your problem.

Steve

 

[Petersho1]

What is CEL?

 

[Xs SHO 1]

Check Engine Light....

 

[Xs SHO 1]

DHMag:

Petersho1:
I'm getting scared.At the moment when this start I feel a little jolt, like changing gear,but why O/D button works?I mean rpm goes up and down as I push the button. What is the defference betwen 3rd and 4th gear in rpm, mayby I'm loosing the 4th gear?

if the bands are slipping, here is something you might look into. but first a warning...i have never done this, only been told about it, so if you choose to do it, i am not to be held liable for any mishappenings. ok, with that said, ive heard that could could pour a capful of brake fluid into the tranny fluid. something causes it to make the bands sticky, hence, curing the slipping gears.

eek!

 

[Petersho1]

NO CEL sorry, I'm silly, check what heppen later-engine stopped at 30mph and cold wheter=crappy gas, what is wrong whith SHO in cold wheter?