Haha - yeah simon mentioned the TPS back on page 1 - the unit was checked and deemed ok. Even a specialist said I needed another new box!

Turns out the TPS malfunctions after 20 mins of driving/or when engine gets up to temp. It's all very peculiar....at least it's sorted.

Cheers all involved.

IT LIVES!! After months of slippage - the van is running great. Turns out it was the TPS; malfunctioning either when gear box temp was hot/or a duration of time had passed. Old Sensor worked fine on start up - so this was putting us off the scent!! I was just about to purchase another box too!! Phew...

Thank you.

Hi all,

Any ideas where I can source one from? Everywhere seems to be out of stock.

Ta

UPDATE 10383! Hi all, Well this evening has been rather busy, dropped the sump again and flushed Torque coverter. After starting, the box immediately slipped. (It normally does this when warm) So after another look around, We noticed a bush missing from the selector cable. Wondering if the issue cou...

Mike - there are 2 similar problems here. One from the OP and one from me. The thread is blending into one!! Hahaha. Yep - I'm waiting to hear from specialist. Terminally bewildered - sounds identical to my issue tbh. I'm also thinking a tenpreture sensor has failed - 2 boxes with indentical problem...

Yeah - it's just that I didn't drain the TQ itself. Will wait for fluid to be pumped around and then drop the sump again.

Would brake bands play up when warm?

Ok just an update... Fans are working. Sump off and fluid changed - old AT was Dark brown. (Didn't drain TQ - will do over next few days). Temp of engine was still up - drove off and slipped straight away. I'm guessing this rules the fluid out - and pointing towards something regulating the tempretu...

just curious, does the cold start work ok or does it chug into life when the weather is really cold, and do the front radiator fans come on when the engine is really hot. When it's been left standing for a while it does chug into life (some white smoke when cold). Runs rough for 10secs or so. After...

Just a thought as I am not auto techy .. If the problem generally occurs at the same time / speed/ engine temperature ... is it about the same time as the gearbox goes into 'lock up' ..?? My limited understanding is that when the fluid is warm and at a given road speed (I 'think' on the Bongo @ aro...

Nah - the new gear box was installed (inc torque converter) and new fluid installed.

However, I supose the garage could have used fluid from the old box.

It is defo not the right colour. New box went in during feb.

How do I drain the torque converter?

Yep the torque converter was changed too - we actually thought it was that and not the gear box. But changed both anyway.

I know. It doesn't make sense does it. And what makes it even more confusing is the problem is identical. Loss of power - then noise after a few weeks - only happens when warm (20 or so minutes into journey). Totally at a loss here. If another box is put in and the issues occur again.... Well I won'...

That's the one.

Still the the same - it's making a sucking sound now when it slips (sounds a little like rain in the wheel arch). Identical to before.

Unsure if I should do a full atf flush/clean or bite the bullet and take to a specialist.

Any input is much appreciated.

The gearbox was changed in feb - new fluids were put in then.