After cleaning and replacing my air filter today, I fired up the car and poked my head around under the hood for a few seconds (a habit after I once left the MAFS unplugged, and found that my car ran like ass the next morning). I noticed that if I gave the throttle a quick flick, revving up to maybe 2000-2500rpms, I could hear a quick series of metallic pings right as the engine speed leveled off, and that sounded they were coming from lower down on the motor. It would last for maybe 1/2 second, even if I held the throttle steady. It wasn't loud enough that I could hear it inside the cabin, and I'm fairly certain I've never heard it when the engine is warm (I'll take a listen tomorrow after work).
It doesn't sound like detonation-related pinging, but then I can't be sure I've ever actually heard it before, hehe... Plus, it doesn't seem right for that to happen on a cold motor. I'm no expert at diagnosing engine noises, so does anyone care to take a stab or prod me for more info? I did a little bit of googling, but I didn't find anything that seemed terribly relevant.
It doesn't sound like detonation-related pinging, but then I can't be sure I've ever actually heard it before, hehe... Plus, it doesn't seem right for that to happen on a cold motor. I'm no expert at diagnosing engine noises, so does anyone care to take a stab or prod me for more info? I did a little bit of googling, but I didn't find anything that seemed terribly relevant.