Oil gauge is reading low oil pressure i got an oil change and it still did not change
You didn't mention the actual pressure but an engine requires as low as 6 psi when the engine is idling and 15 to 20 psi while driving at higway speeds. Your Yukon requires a 5w-30 weight oil. If the oil used is correct, you will want to have the pressure sending unit and gauge checked.
A mechanic will install a "mechanical" oil pressure gauge tester on the engine to find out what the actual oil pressure is. If the mechanical tester says the oil pressure is good, he will then begin to diagnose the electrical pressure gauge system.
If on the other hand, the mechanical gauge verifies the pressure is still low, he must diagnose the engine mechanical problem that is causing the low pressure issue.
Good luck.
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.
SOURCE: oil pressure gauge reads 80 while running
could be one of two things, oil pressure switch (located on top of engine behind intake) or instrument panel cluster, if your vehicle has under 70,000 miles, it's covered under warrenty
SOURCE: low oil pressure 93 GMC P/U w/350 motor w/205,000 miles gauge
While engine is running, open the cover where you add oil to engine and see if you see a good flow of oil, if good flow, could be as easy as replacing oil sending sensor. got to realize that if poor maintenance history your engine may not be building enough pressure at iddle to move your hydraulic operated valves, only when you rev it up it will pump enough to run smooth. if running engine too long, you may cause more damage to other engine components such as crankshaft and cam shaft bearings. if you can spare a few bucks, have a good mechanic check your oil pressure with a mechanical gauge. another cheap option is to replace oil pump. last resort if you love your truck as much as we do,replace engine or rebuild it. At 205,000 this is a normal symptom, other than timing chain problems, most engines don't make it that far. hope this helps!
SOURCE: 2003 Sierra Pickup 4.8 V8, oil pressure reading
{: ) The engine oil pressure sensor is on the left rear side of the engine block. Remove first the intake manifold sight shield (cover). The 3 wires all go to the powertrain control module (PCM).
Black = low reference ; Gray = 5v reference ; Tan/White = oil pressure signal.
On the other hand, the oil level sensor has two wires; Black/White = ground (G103); Brown = oil level signal going to the PCM. See sample diagram below:
The PCM monitors the input signals coming from these two sensors, and it will communicate to the cluster (IPC) through Class2 serial data line. The IPC will then indicate the corresponding values on the pressure gauge and will also indicate a warning lamp or message when necessary.
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