Gen 2 Auto box not unlocking clutch before down shifting
Posted: Mon Feb 03, 2014 8:47 am
Hi guys,
So on my Gen 2 3.5 V6 auto, the following happens:
When shifting up form 3rd to 4th, the torque converter is unlocked, and then locks with a decrease in rpm of about 300rpm. All normal.
But when I'm going up a slight uphill and press on the throttle a bit, the box shifts straight down to 3rd, without unlocking the torque converter in 4th first... I've tried in normal A/T mode and power mode, I tried by very gently pressing the throttle, but there's nothing to do, the box always goes straight down to 3rd, and up to 4th unlocked, then locked if I release the throttle a bit.
Is this what the box is supposed to do? As far as I know about auto boxes, it shouldn't do that, but can someone confirm?
I've got an oil and filter change on my to do list, as there's also a slight slip going from a stand still when hot. And the lady's got a few kms on the odo and I'm not too sure how the previous owners treated her.
The TPS is also acting funny sometimes, so I thought maybe a jump in resistance value could be interpreted as a kick down command, therefore skipping the unlocking of the torque converter, but I've tried at different pedal positions, so I doubt this is the cause.
Any ideas or advice are welcome.
Thank you.
Fabien.
So on my Gen 2 3.5 V6 auto, the following happens:
When shifting up form 3rd to 4th, the torque converter is unlocked, and then locks with a decrease in rpm of about 300rpm. All normal.
But when I'm going up a slight uphill and press on the throttle a bit, the box shifts straight down to 3rd, without unlocking the torque converter in 4th first... I've tried in normal A/T mode and power mode, I tried by very gently pressing the throttle, but there's nothing to do, the box always goes straight down to 3rd, and up to 4th unlocked, then locked if I release the throttle a bit.
Is this what the box is supposed to do? As far as I know about auto boxes, it shouldn't do that, but can someone confirm?
I've got an oil and filter change on my to do list, as there's also a slight slip going from a stand still when hot. And the lady's got a few kms on the odo and I'm not too sure how the previous owners treated her.
The TPS is also acting funny sometimes, so I thought maybe a jump in resistance value could be interpreted as a kick down command, therefore skipping the unlocking of the torque converter, but I've tried at different pedal positions, so I doubt this is the cause.
Any ideas or advice are welcome.
Thank you.
Fabien.