Thanks for the info. I will ask my mechanic to check it. I will post when I find out.

I have 2003 1.8l Vibe with auto transmission. The car has 50,000 miles & I use 5-30 synthectic oil. I started with a tapping almost knocking noise when cold then goes away when it warms up. I took it to my mechanic for a valve adjustment but he said the noise is coming from the timing chain... e...