i have a 2006 trailblazer 5.3L and the oil pressure gauge reads about 45 psi but the oil light is on. have fresh oil change , why is the light on?
I replaced a faulty oil sensor 2 months ago. I have lifter noise when I first start
until it warms up. The engine has 135,000 mile and I just oil changed the
engine after my oil light came on. The oil level was normal so I changed the oil
and filter and the oil light still on but gauges read 40-45 at idle. What do you
think is going on?
If you have lifter noise then you don't have oil pressure. Seems like there is a high failure rate on these pumps.
I understand these engines with high miles have a tendency to have noisy lifters at start up and quiet up as the engine warms. This is what i'm been experiencing for over a year but never had the oil light stay on and still have a normal oil pressure reading, proper oil level and clean 5w-30 oil. If i had a bad oil pump i would think my oil gauge would read low and check engine light go on and eventually i should hear a knocking in the engine which i do not. So i dont think its a bad oil pump.
The only way to know for sure is to hookup a manual oil gauge and compare the two readings. If you get a bouncing needle on the manual gauge it is indicating something is going wrong, possible pickup tube and or screen, pump early stages of failure.
yes good idea. That will be my first check.
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