Hello everyone. I've just joined, so please forgive me if this question has an obvious answer I don't know about.

My 1995 80 TDi Avant loses power under load, such as when going up long hills on the motorway (speed will drop down to 70, no matter how much throttle I give it.) It's not exactly a ball of fire on the flat either, and I'm sure performance isn't as it should be. I've replaced the air flow meter, as that seems to be a common solution for power loss problems, but it made little or no difference. I don't know if it's significant, but the power problems seem to be happening around 2000rpm in 5th (or 4th if going up a steep hill), and there's generally quite a bit of black smoke chuffing out the back when it happens.

Also, does anyone know if the 80 TDi requires an 8 or 10 pin plug for an 'ebay special' tuning box? I know they're not the best way to gain performance, but I've been in a Seat Leon with one fitted, and it really made a difference.


Any suggestions would be gratefully received.

Thanks
John