Vac hoses are connected correctly at SVO with tight fit.

Hoses to Air Pump and to EGR are soft, pliable and orange (not OEM). Never could "see" where vac hose to Air Pump is connected. It's routed between the pump and block. Is "special mirror tool" used to see the connection? Pump is very quiet, but never have noticed a clutch engaging or disengaging.


Meter at 200mV, Engine hot and at idle.

Yesterday meter consistently fluctuated between 47 and 53 with both vac hoses connected and with one at a time disconnected.

Today meter consistently fluctuated between 18.2 and 21.5 with both vac hoses connected,
with hose to fuel regulator disconnected between 21.5 and 23.6 and with hose to SOV disconnected between 21.7 and 24.4

Are these vastly different (47-53 vs 18-24) readings correct or am I doing something incorrectly?

Considering my reading (if correct) is not near the .9 for Rich, can I assume the o2 sensor needs to be replaced?

Bob