Cold engine noise
Hi, I have a 2000 p71. Lately, ive been noticing a ticking noise when the engine is cold. It is not constant, just when getting rolling. I baby the throttle when its cold, yet i still get this noise. My truck makes the same noise when i am lowing a heavy load and have not filled up on premium. Could this be preignition or something worse? I have always ran regular gas in this car and have never heard this sound. Do i need to run premium? I dont think i bought a bad tank of gas, as it came from mobile. I'm at a 1/4 tank right now and plan on filling up with premium tomorrow. Is there anything else i should look for/worry about?