2007 GMC Yukon IOL PRESSURE PROBLEM

PATRICK RICHARD

MEMBER
2007 GMC YUKON
6 CYL
AWD
AUTOMATIC
10,000 MILES

Sirs, I have a 2007 gmc denali, 6.2 litre. Great car. I noticed my iol pressure was very low after coming from town. Changed the iol a month ago. With the denali in drive the iol pressure was touching the red. Took the car in to the dealership the next day. They checked it out so said and told me it was fine. How could it be. What is the recommended oil pressure, running temp in gear for this car. Please advise me of any advise. Thanks very much

3 Replies

BRIAN 1

MECHANIC
1,030 POSTS

Oil Pressure - Minimum - Hot 6 psig at 1,000 engine RPM

18 psig at 2,000 engine RPM

24 psig at 4,000 engine RPM
did the dealer check oil pressure with a guage?Did they check the guage in the dash to see if it works properly? What weight oil are you running? Post back with any other info or questions.

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Tuesday, December 30th, 2008 AT 9:11 PM

PATRICK RICHARD

MEMBER
2 POSTS

Yes they checked it a guage.I run the rceommended weight iol. The ychecked the guage so said.

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Tuesday, December 30th, 2008 AT 9:28 PM

BRIAN 1

MECHANIC
1,030 POSTS

You might want to take it to another dealer they might have overlooked something.I did find this bulletin to look at it might help. Some customers may complain of low oil pressure, no oil pressure, and/or engine noise. This may be the result of a sticking oil pump pressure relief valve. In some instances, the customer may experience this intermittently if the valve frees up when the engine cools down.

Recommendation/Instructions:
If the SI diagnosis isolates low mechanical oil pressure, replace the oil pump, flush the oil cooler lines (if equipped), clean the inside of the oil pan, change the oil and filter, and re-evaluate the concern.

Notice: If an engine noise is noticed after replacing the oil pump, follow the SI diagnosis and repair the engine as necessary.

Post back with what you find.

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Tuesday, December 30th, 2008 AT 9:45 PM