Quote:
Originally Posted by tangofox007
Anything that you may have read that suggects that the switchover valve has anythng to do with vacuum is erroneous.
The switchvalve is normally open so that manifold pressure is "transmitted" to the ALDA so that the ALDA can deliver fuel in proportion to manifold pressure. Manifold pressure is normally regulated (at the top end) by the turbo wastegate. In the event that the wastegate fails to properly regulate boost pressure and an overboost condition occurs, a switch in the intake manifold closes to provide a ground path to the switchover valve, causing it to actuate. When actuated, the switchover valve vents pressure from the ALDA and blocks pressure from the manifold so that fuel delivery will be reduced as a secondary method of preventing an overboost condition.
|
I wasnt implying i had read anything that said that switch was vacuum related, i was just trying to say i wasnt sure what this switch did, and it appeared to be a "vacuum" related switch.
I did run the lines back to it and the car runs the same. Now, I'm wondering, have these switches failed in a way where they wouldnt prevent over-boost. In other words, I'm wondering why the previous owner would have by-passed it if it wasnt running poor with it connected.
__________________
1982 240d, maual, 235k mi (flat black) $500-owned since, 9-06
1980 300sd, auto, 125k mi (silver)$1500-girlfreind owned since, 6-08
|