I am slowly working the kinks out of the new V12, and ran it for 15 minutes and had no engine codes when I was done. Replaced all the 02 sensors which cleared the last nagging error (such a deal - NTKs for 26 bucks on amazon).

I'm concerned that the idle speed is low. I used a smoke machine to test for vacuum leaks, and I cleaned the MAFS with MAF spray. I cleaned the throttle bodies with throttle body spray.
It idles smoothly, and doesn't hunt but as it warms up it drops down to 700RPM or so, and then if you blip the throttle it will idle at 550 RPM. This has the oil pressure right at 4 PSI which will flick the oil pressure light. (which we don't want!).

Two questions - one, what is your idle once the motor is warmed up, and two, for the pros - what am I missing that would cause it to be low, and three, how do I raise it? Or will this fix itself once I drive it a while and it learns?

Also, for the oil guys - the pressure was 20PSI at 1000 RPM with the oil at 130 degrees F. Makes me wonder if I should up the viscosity.

 

The idle speed is specified in the back of the owners manual. About 760rpm IIRC

 

Thanks - and it is supposed to be set electronically by the throttle bodies that act like Idle control valves (adjusting plate angle to hold a speed). Trying to figure out if it's a learning thing (It will slowly fix itself), or there is some systemic fault that is causing low idle... Sadly there is no idle adjustment screw hidden behind a metal plate that I can drill out and adjust!