02 Ticking Noise

[MORENOG]

I HAVE AN O2 AND I AM HAVING A TICKING NOISE.ITS LOUD AT COLD START UP AND SOMETIMES IT SMOOTHS OUT.CHANGED OIL AND RAN ADDITIVE,NOTHING.USED HIGH OCTANE GAS, HELPED SOME.I CHANGED OUT THE INLET MANIFOLD,SAME TICKING. ANY IDEAS APPRECIATED.

[Rovin4life]

if you put in a new intake manifold and its still ticking.

its the lifters.

you dont loose coolant or have oil in the coolant at all do you.

[MORENOG]

None That I Have Seen.

[Phat_pengiun]

I find this happening sometimes. I have absolutely no idea what causes it, but it sounds like it comes from the rear of the car to me. It's a little bit faster than a clock, almost like something dripping. It's easier to hear when sitting in the rear.

[Hippo]

Maybe its the rear subframe that cause the tick noises.
Needs winding in some models.