In almost every engine the oil pressure switch, sender or oil pressure gauge pipe is connected to or screwed into the main oil gallery or oil filter head.
The main oil gallery generally runs the length of the cylinder block about halfway up, the most convenient position to provide oilways to all the crankshaft bearings and the camshaft and valve gear.
Unless the sensor is very cheap it would be as well to carry out an oil pressure test while it is removed and then if the pressure really is low the new sensor can be returned for a refund.
The VERY FIRST THING YOU NEED TO DO is hook up a manual oil pressure gage and check the pressure, chances are the sending unit is defective
SOURCE: 1990 GMC Sierra lifters knocking. Oil pressure
I doubt it....It could be a totally worn out engine.
Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/sean_54c3a3dc48a7773c
SOURCE: when cranked: ticking noise, low oil pressure
I have a 2002 with 130,000 and it ticks,but goes away after 2 min,if yours continues to tick you may have a rocker arm that is getting lose or a lifter that is not pumping up.
SOURCE: where is the oil pressure sending unit?
The oil pressure sending unit is located on the engine block, passenger side by the Distributor. Good luck and make sure you get the right sending unit, there is the simple unit that only turns on a low oil pressure light and the other will send signals to the oil pressure gauge.
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: LOW OIL PRESSURE ON 2007 GMC SIERRA 1500. CHANGED
have it tested using a manual gage if still low then main baring ore most likely bad that would mean a over hall if is really low and bearings bad should be making rattle noise when started up first few seconds
Testimonial: "thanks alot.truck is not making a rattling noise.we did check it with a manual gauge.it read about 10 at idol. press. gets better as you incr speed"
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