Oil pressure problem

JONSANFORD

MEMBER
2001 GMC SONOMA
4 CYL
2WD
AUTOMATIC
104,000 MILES

2.2l gmc sonoma low oil pressure?

Wednesday, January 12th, 2011 AT 9:04 PM

5 Replies

JDL

MECHANIC
16,098 POSTS

I'd use a mechanical gage in place of the oil sending unit. See if that gage and the gage on your dash read the same? I didn't see a minimum spec for the four cylinder. 56 psi@3000 rpms. I did see idle spec for the 6 cylinder, oil pressure minimum, 6psi. You may need to check compression.

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Wednesday, January 12th, 2011 AT 9:30 PM

JONSANFORD

MEMBER
2 POSTS

I checked I for sure have low oil pressure. Starts out fine but as engine warms up pressure continues to drop. Already checked the pump starting to pull bearings caps now

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Wednesday, January 12th, 2011 AT 9:53 PM

JDL

MECHANIC
16,098 POSTS

If I was going into the engine, I'd replace the pump anyway.

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Thursday, March 3rd, 2011 AT 7:47 PM

SCOOB

MEMBER
1 POST

I replaced oil pump sending unit and all bearing. Still when warms up the gauge drops to zero engine runs fine

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Friday, August 23rd, 2024 AT 8:59 AM

KEN L

MASTER CERTIFIED MECHANIC
48,363 POSTS

It sounds like the oil pump pressure spring is broken or the oil pump pick up is clogged. When you did the bearing did you look at the oil pump and pick up screen?

This guide may help as well

https://www.2carpros.com/articles/high-or-low-engine-oil-pressure

Please go over this guide and get back to us.