Quote:
Originally Posted by Bob Weir
Did white one to sov from intake side.
Too cold to go outside with flashlight. So from memory  something makes me think there's one from sov to air pump? If so I seem to remember it "disappearing" behind the pump. Or am I having vacuum confusion of the brain?
Bob |
The one you replaced is engine common feed vac to the SOVs [egr and air ].
There are 2 coming out of the SOVs...one goes to egr and the other goes to the flow valve between the air pump and the engine. That is a vac actuated valve to allow the pumps air to reach the engine. If the pump runs , then you want to check that valve and see if vac is going to it .That would be the other vac line you are referring to and a disconnect here would be the cause of your AIR code. [ air not flowing to engine even though the pump does run] and thus, the 02 sens does not see lean and fails test, triggering air code/ce lamp.
There is also a final check valve at the engine to allow one-way checking of exhaust so it can't get back to pump. That is the whole system.
I have seen some AIR codes that where caused by guys putting the wrong connectors or vac lines on the sovs when re-installing after repair work, as they are a piggy-backed unit. If this is done , the egr is getting the air sig and the air is getting the egr sig. Might want to check that if all other things check out..
There is an article about it in the archieves by me or SB....