So I bought a new to me 2004 with 155k miles and she’s amazing! Engine sounds healthy, no codes, revs great! However……. Under acceleration it makes a tick tick tick airy sound that increases with throttle. It sounds just like an exhaust leak, but isn’t. I just had the manifolds done, exhaust system redone too. New timing and water pump plus bearings and pulleys. It’s not a lose metal shroud, fan noise, etc. again, it ONLY presents under load accelerating. Not at idle revving. When driving, it sounds like it’s coming from the engine area up front. Here is a video of it in action. Ps, we performed an excessive smoke and pressure test. Nothing!
