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The 6VE1 engines coolant temp sensor is in the cross over housing on right hand front section of head just under throttle body (ECU). From memory the 6VD1 (older) engine is in similar position. There are 2 sensors one for engine ECU & one for Temp gauge the single wire one is for temp gauge which is in same cross over housing but left side.
OXYGEN SENSORS GETTING OIL ON THEM. THAT IS A BAD SIGN.THAT YOUR ENGINE BURNING OIL.LOOK AT SPARK PLUGS IF THEY ENGINE OIL DEPOSIT ON THEM.YOU HAVE WORN PISTON RINGS,WORN VALVE GUIDES OR WORN VALVE SEALS. YOU CAN REPLACE AND CLEAN BOTH O2 SENSORS IF ENGINE BURNING OIL.IT WILL KEEP LEAKING OIL ON O2 SENSORS AND SPARK PLUGS.
Engine not at operating temperature--Cold Converter,Thermostat Stuck Open
Malfunctioning Mixture Control--O2 Sensor reading lean all the time.
Coolant Temp Sensor high resistance or open circuit
Check your vacuum controllers and injectors if equipped. It sounds like your vacuum is falling off when the engine reaches operating temperature which points towards a bad MAP sensor/valve or a bad PCV valve.
I'd check to see what is in the crankcase currently; with modern multirange oils, that sounds high.
The typical operating range is from 30-60#; 10 seems low for an idle pressure but then idiot lights are supposed to trigger at ~ 4# pressure.
If it was mine, I would change oil and put a multirange type suitable for your area in it to see what influence it has.
If you are in a temperate climate as I am, it might be time to change from summer to a winter range; 10W30 is good for us and 10W40 in summer (WV).