No upshift at WOT only. Shifts fine otherwise

[SEOK]

94 740 with 5hp30 black label.
If I put it to the floor WOT it will downshift as it should but won't upshift, it will just bounce around near redline shift point, it will shift only if I let off the throttle slightly, basically to the point of releasing the kickdown switch. At least that's what it feels like. Trans shifts great otherwise, upshifts and downshift. It was serviced a couple years ago @120,000miles with correct fluid, and had a speed sensor replaced last year that caused a Trans program error. Everything works as it should other than the upshift when the pedal is to the floor only. Any idea what this could be? Could the kickdown switch have something to do with this?
Thanks

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[whiskychaser]

On older cars, the kickdown switch just grounds a pin on the TCM. I'd suggest that if you keep that switch closed, you are continuing to command the tranny to select the next gear down. It sounds like it is working perfectly to me

[SEOK]

Ok that makes sense. I'm just not use to this style I guess. I drive mostly classic american cars that use a cable to kickdown the trans and it will automatically upshift while the pedal is to the floor.

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[SEOK]

It just seems odd to me that I could punch the throttle to the floor and take off and it will just bounce around at redline and not know it should shift into the next gear, just because the pedal is depressing the switch. I would think it would know to select the next gear automatically without having to back off the throttle. We've had the car a few years now and I've definitely pushed it hard a few times. I could be wrong, but I just don't recall having to back off to get it to shift.

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[Zerocool818]

Bump.
Just googled this and I am having the same issue. I don't think its normal. mine seems to reach redline and then wait half a second and then shift. Feels like it holds the gear for too long and it basically tops out the engine, makes for a weird feeling, almost like in a manual if you just don't shift, just doesn't pull

[shogun]

your car is an E38 750iL, wrong forum here anyway, we are talking about E32. But in any case your E38 750 has EML and there the throttle pedal goes via a potentiometer + EML, not like in case of the E32 740 via a cable.
EML explained http://www.europeantransmission.com/...MW/EML-BMW.pdf
yours is Siemens IIIs E38 M73 1995-present
our E32 have Bosch 1.7 and/or 1.2 systems, different throttle valves etc pp.
Better post your problem in the E38 forum.
Too different systems and even different transmissions