Oil Pressure Spike

[gmcleer]

Has anyone experienced a brief spike in oil pressure? I have noticed on two occasions a sudden jump and immediate return to normal pressure. Just wondering if anyone else noticed the same thing.

[SMiller]

Oil pump is two stage, I believe 3500rpm is where it jumps to high pressure.

[gone_fishing]

Instrument Cluster Oil Pressure Gauge

The oil pressure gauge needle oscillation is 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. Upon completion of the three tests, the self test will not occur again until after the engine is turned OFF and another cold soak has completed.

TIP: The exception to this self test occurs if the vehicle has come to a stop BEFORE the three tests have been completed. If that occurs, the self test will run again until the test can complete.

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://sandyblogs.com/techlink/?p=2139

[high country]

And here I thought I was just loosing it when I saw it happen lol
Thanks guys I feel better now.

[02suburbanZ71]

Instrument Cluster Oil Pressure Gauge

The oil pressure gauge needle oscillation is 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. Upon completion of the three tests, the self test will not occur again until after the engine is turned OFF and another cold soak has completed.

TIP: The exception to this self test occurs if the vehicle has come to a stop BEFORE the three tests have been completed. If that occurs, the self test will run again until the test can complete.

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://sandyblogs.com/techlink/?p=2139

Wow had no idea

[gmcleer]

I noticed it when the engine was hit and had been running for a while. Could it be a malfunction? Should I be concerned?

[Darmichar]

I have noticed this a few times under hard acceleration. Happy to know it's supposed to be doing this.

[Eddie 70]

I noticed today when I was on the interstate coming home, I just happen to catch the needle dropping back to about mid point on the gauge.

[chuckl1218]

Normal during initial test and WOT...

I noticed today when I was on the interstate coming home, I just happen to catch the needle dropping back to about mid point on the gauge.

[SMiller]

Duel speed oil pump, all is well.