Hello so last week when i started my car it sounded like a jet engine taking off and wouldn’t stop. I put it in a new h8 batttery and did a coolant flush myself but nothing fixed the issue. Had an obd tool reset everything and the car was completely fine almost. I noticed when warming up the car there is a repeated fasted paced but low sounding ticking noise until the car is warmed up, if you rev it it sounds like as if theres zero oil through the system or something that makes a loud grinding noise near the exhaust that sounds like a toy spinning lip whistle and won’t stop until the car fully warms up. Today the temp gauge was taking abnormally long to move/warm up and would actually go down when i revved the car. I also feel as if the car won’t lower its rpm after warming up like it did before, its at slightly above one notch above 500rp. The only difference in the car is i had an h7 battery before vs an h8. When i got into the car it read it was 100 degrees F in the sun but its 65 degrees F outside. The last time i scanned the car these codes came up. P050c, P2610x2 ecm/pcm engine off timer performance/engine off time has implausible value& P0420.