86 EH Auto Delayed Shifting
Posted: Sun Jul 15, 2018 1:24 am
Hi everyone
Took the car for a nice long drive this weekend, approx 1,000 km's all up. Car went like a dream apart from one issue that I've noticed.
Its an 86 Euro 635csi with the EH Auto. What happens is i'll accelerate up to 100km/hr and the transmission will work perfectly. Smoothly shifts up through all the gears and into 4th OD at 100km/hr. It shifts smoothly down when decelerating too.
Now, if I approach a hill in 4th OD and I mash the gas, it kicks down to 3rd and takes off. Great
This is where the problem arises. When i've buttoned off the gas and am cruising down the other side, it sits in 3rd and refuses to change into a higher gear for about 5 WHOLE minutes. The effect is that i'm heading along the road at 100km/hr at roughly 3,000 rpm.
When its doing this I've tried manually selecting the gears and it doesn't seem to help either. If I put it in second, then third and finally "D", it changes down to 2nd and then shifts to 3rd and holds it again. Changing the switch to "S" mode and back to "E" does nothing either, likewise with "123" and back to "E".
After about 5 minutes it DOES change into 4th and then OD but in the meantime the only way to solve it earlier is to slow down to about 50km/hr where the car drops down the gears itself. When I start accelerating again, it all works nice and smoothly shifting all the way through to 4th OD. The transmission has already had a new filter and fluid change and I remember it had this problem beforehand too.
Does this sound like a TPS problem? Or is it likely to be something in the box itself?
Any help with this would be much appreciated.
Cheers
Mark
Took the car for a nice long drive this weekend, approx 1,000 km's all up. Car went like a dream apart from one issue that I've noticed.
Its an 86 Euro 635csi with the EH Auto. What happens is i'll accelerate up to 100km/hr and the transmission will work perfectly. Smoothly shifts up through all the gears and into 4th OD at 100km/hr. It shifts smoothly down when decelerating too.
Now, if I approach a hill in 4th OD and I mash the gas, it kicks down to 3rd and takes off. Great
This is where the problem arises. When i've buttoned off the gas and am cruising down the other side, it sits in 3rd and refuses to change into a higher gear for about 5 WHOLE minutes. The effect is that i'm heading along the road at 100km/hr at roughly 3,000 rpm.
When its doing this I've tried manually selecting the gears and it doesn't seem to help either. If I put it in second, then third and finally "D", it changes down to 2nd and then shifts to 3rd and holds it again. Changing the switch to "S" mode and back to "E" does nothing either, likewise with "123" and back to "E".
After about 5 minutes it DOES change into 4th and then OD but in the meantime the only way to solve it earlier is to slow down to about 50km/hr where the car drops down the gears itself. When I start accelerating again, it all works nice and smoothly shifting all the way through to 4th OD. The transmission has already had a new filter and fluid change and I remember it had this problem beforehand too.
Does this sound like a TPS problem? Or is it likely to be something in the box itself?
Any help with this would be much appreciated.
Cheers
Mark