Question about 1997 GMC Yukon

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Oil pressure reads high 40 to 60 psi, guage never flucuated this much before new engine

Brand new long block in a 97 GMC Yukon 5.7L EFI just fired her up, the electronic oil pressure and water temp gauges fluctuate like crazy oil pressure jumps between 40 to 60 psi. The gauges were not this reactive prior to the install

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Try another earth cable ?? straight to engine and chassis

Posted on May 30, 2009

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1 Answer

MY 97 yukon has Rough idle, loud knocking at high torque, and oil pressure goes from 40psi to 0psi. what do you think is the problem?


Checking oil level won't tell you anything

You need to put a mechanical gauge on
the motor,you can't go by the dash for accuracy

You could have many things that need to be
done preventative maintenance wise before
you even start to diagnose the couple of current
issues

Dash Check Lights?
Codes?
Driven for two years & never worked on?

We can't guess,you need a repair shop to
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Oct 03, 2012 | GMC Yukon Cars & Trucks

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Why do i have high oil pressure on a 2006 yukon (80psi)


Not uncommon for oil pressure to read @ 80psi when oil is cold an thicker or a heavier weight oil, however, does it fluctuates or simply stays @ 80psi cold or at running temp? if so, its normal, if it stays there and doesn't move, that may a bad guage or sending unit. consider this and get back. I am a mechanic . TH

Dec 06, 2011 | 2006 GMC Yukon Xl Denali

1 Answer

I have a 2004 Yukon Denali. The oil pressure gage decreases when I make a full stop. When the car is running, the oil pressure gage goes up very slowly. I am wondering if anyone has experienced similar...


Your oil pressure will flucuate with the rpm of your engine. It is generally higher also when the engine is cold as the oil is thicker. This is normal as long as your oil pressure stay in the normal operatting range.

May 09, 2011 | 2003 GMC Yukon Denali

3 Answers

Oil pressure guage stays at 40 psi on ign/engine shut down, but drops to 0 psi when ign is turned back on, and then on starting of engine operates normally... What's up ???


the oil pressure gauge only gets a reading when the engine is runningas the oil is being curculated. when you shut the vehicle off it should go back to zero and be there until the vehicle cranks back up. i hope this helps

Feb 05, 2011 | 2002 GMC Sierra 1500

2 Answers

Low oil pressure


If the engine is not making any noise.It is probably the oil sending unit that is defective.If you want to be sure you will have to install a pressure gauge and check the pressure when the vehicle is at normal operating temperature.If it is above 10 psi then replace the sending unit.It is located on the back of the motor on the block by the left cylinder head.You might need a special socket for it.Hope this helps.Good luck.

Jan 12, 2010 | 2004 GMC Yukon

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1995 gmc yukon when the motor is cold the oil sending switch show a psi of 40 when the motor heats up the psi goes down to 20 when you are either at a stop or idling when you are going you see the sending...


you may have a bad oil filter, the best check is to install an oilpressure guage to find out what the actual pressure is, or maybe you put in too light an an oil,

Nov 13, 2009 | 1995 GMC Yukon

2 Answers

OIL PRESSURE GUAGE, IT SHOULD BE STABLE?


bout the oil pressure gauge its normal to go up but not to high coz u might overheat, try checking the cylinderhead gasket if there is pressure coming out, replace the gasket if needed

Jul 15, 2009 | 1999 GMC Yukon

1 Answer

Where is the oil level sensor located? oil guage wiggles between 40 & 60 at idle and stays on 60 on the road.


That's not oil level you see on the gauge -- that is oil pressure in pounds per square inch (PSI). It is normal for the pressure to fluctuate when the engine RPM goes down. If it stays on 60 PSI on the road, you are very lucky -- that is excellent oil pressure!

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1 Answer

Engine will not fire


is the spark blue?xheck all the connectors to the mfi iac and ignition module,and the distributor

May 28, 2009 | 1997 GMC Yukon

2 Answers

Sudden change in oil pressure gauge


DIAL IN CAB COULD BE AT FAULT, NEED TO GET ANOTHER DAIL GUAGE AND CONNECT TO SENDER, IF SAME COULD BE SENDER, IF STILL THE SAME, PRESSURE VALVE IN BLOCK STICKING DUE TO DIRT OR U/S, OR AT WORSE !!! ENGINE WORN, THIS WILL BE CONSTANT IN MOST CASES, FAULT IN GUAGES ARE NORM INTERMITANT.
LOTUS

Feb 02, 2009 | 1993 GMC Suburban

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