I have disabled a few with no noticable effects on engine performance. In a few instances we have removed the pump. No effect on performance. In my opinion the pump was a silly addition. The same amount of smog goes out the exhaust with the air pump only diluting it with air. If it was so good at reducing pollution why did they discontinue it?
Bill Lewallen Lexington,Ky. The Blue Grass State. Where diesels purr,and turbos whine.