Question about 2000 GMC Yukon XL

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5.3 L Yukon XL oil pressure problems

The oil pressure goes down at altitude so I put Sea Foam in, ran it 1 hr and changed the oil and the pressure went up dramatically and was fine for our 600 mile drive yesterday. This morning I started the car in cold conditions(24 degrees f) and now I have 0 oil pressure. What should I do?

I read that the 0 ring being cut can cause air to get introduced and I also read that water can get introduced around the intake manifold as coolant runs through it.

Please advise.

Thanks.

415.250.1801

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  • GMC Master
  • 83,514 Answers

Well first the GM oil pressure sending units are notorious for false readings, so what you must do is remove the oil pressure sending unit and plug in a test mechanical gage to verify the engine has acceptable oil pressure, after you are certain the pressure is ok replace the sending unit, it requires a special socket to remove it, the socket is about $5.00 USD. There is a deep socket and a shallow, so check the sending unit for the correct socket fit.

Posted on May 02, 2017

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Posted on Jan 02, 2017

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jmassengill
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SOURCE: OIL PRESSURE LIGHT COMES ON AND PRESSURE GOES TO 0 ON GAUGE

Any time the oil pressure is 0 you take a chance of locking up the motor. The only way to know for sure is to put a pressure gauge in the oil pressure sending unit port on the engine and see what the pressure really is. At that point you will either have the peace of mind in the knowledge that the sending unit is really bad and needs replacement or you can then contact a repair shop and tell them what your testing has revealed. I wouldn't drive or run your truck while the oil pressure is at zero.

Good luck

Posted on Nov 10, 2008

motor1258
  • 6674 Answers

SOURCE: Air Conditioning not running cold on 2005 Yukon XL 2500

bigger hose is usually low side.

Posted on Jun 20, 2009

RonPark
  • 855 Answers

SOURCE: 03 gmc envoy with 5.3 140000 miles. Oil pressure

There may be a loose wire or the gauge or sending unit may be going bad. The first thing I would do is to hook up a temporary oil pressure gauge, not using the old one at all. With this watch gauge while driving and see what readings you get. If the readings still jump around you have a pump that is getting weak and failing, If that is the case the pump should be replaced, but with high milage you may consider rebuilding the entire engine. If the readings stay normal start checking for a loose wire at gauge or sender. Then check sender, then gauge and replace as needed.

Posted on Oct 02, 2009

jturcotte
  • 8841 Answers

SOURCE: I have a 95 GMC

Hi, you may have a torn fuel pressure regulator diaphram. The diaphram is behind a square cover on the side of the throttle body, that is held in by 4 screws. Take the diaphram out and check it for tears. If no tears, put it back the way you took it out and check your injectors. Can you see them squirting as you pull the throttle? Is the squirt the same for both? Is it a regular pattern or distorted? If you see issues there, you can take them out and try to clean them. If that doesn't work, replace an injector that has a poor or irregular flow pattern. Please let me know if you have any questions, and thanks for using FixYa.

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Posted on Dec 21, 2010

bluebirdmate
  • 1190 Answers

SOURCE: 2003 yukon xl oil pressure guage

Hello: You may have a inaccurate oil pressure sensor, you might try replacing the sensor but you have to remove the intake manifold to access the oil pressure sensor

Posted on Jan 21, 2011

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