Oil Pressure

[Judboy]

Is it normal for the oil pressure to run about 22 at idle/slow speeds? It runs around 40 when cruising.

[bdbake01]

Completely normal.

[14SLTZ71]

Advanced Oiling System

The oiling system on the new engines incorporates a new variable displace- ment two-stage vane-type oil pump that enables more efficient oil delivery, based on operating conditions.

Its dual-pressure control enables opera- tion at a very efficient oil pressure at lower RPM,

and then delivers higher pressure at higher engine speeds.

An oil control solenoid valve, con- trolled by the ECM, mounted to the oil pump provides two-stage functionality. The oil pump is mounted on the front of the engine block and driven directly by the crankshaft sprocket.

An oil passage at camshaft bear-

ing location permits oil flow into the center of the camshaft. Oil enters the camshaft, exiting at the front and into the camshaft position (CMP) actuator solenoid valve. The CMP valve spool position is controlled by the ECM and CMP magnet. When commanded by the ECM, the CMP magnet repositions the CMP actuator solenoid valve spool directing pressurized oil into the CMP actuator to control valve timing.

Oil pressure gauge needle oscilla- tion will occur due to the two-stage oil pump self-test. The ECM will perform a functionality test of the two-stage

oil pump after a cold soak, when the engine is first started and the vehicle is driven.

This functionality test will occur three times in a short time span and can be observed on the oil pressure gauge as a brief increase (spike) in the oil pressure gauge needle. Additionally, at 3,500 RPM or greater, the two-stage oil pump switches over to high stage and the oil pressure gauge needle will move to the high position.

 

http://www.acdelcotechconnect.com/pdf/TechConnect_SepOct_2013.pdf