I have read many posts on the adjustment of the ALDA (mine is a 85 300TD CA) approx. 160K miles) My question is : What happens (either in IP or otherwise) that causes us to adjust this part? Is the pump going out of it proper setting? - Due to age, etc. Is it the engine? By the way - I had an extra ALDA (untampered) - I had been adjusting mine - had screw maxed. Had new one put on with shim - When I checked mpg - I gained 5 mpg!


Thanks

Steve