2000 Chevrolet Blazer Zr2 Cold start knocking from engine
I have 2000 Chevrolet Blazer Zr2, it has about 148,000 miles. When i start MY truck up in the morning the engine knocks, not severly or violently but there is definetly some light knocking. The knocking will increase in tempo when I increase the throttle as well. When the truck warms up after 2-3 mins the knocking stops and it sounds fine. Also, at cold starts I noticed that the oil pressure gauge is reading really high but then once the truck warms up it goes back to normal. I have noticed no power changes from the engine just a cold start knocking. Also Oil levels are full. What could this be and how do I fix it?