Metal knocking after swapped K&N Cone for stock air filter case.

[a_gunslinger]

I swapped out the loud sucking sound KN metal cone filter I got with my new-to-me 2012 Silverado. Thanks to the amazing mlhaprer here on forums (my spare parts guardian angel) I have the OEM air filter case with a KN filter in it. Still trying to figure out where the stock filter case breather hose went to, so its just a stock filter case with metal KN in it attached directly to TB, no hosing.

After putting it on I fired up the bike and there was a metal engine clank every 3 or so seconds. After about 2 minutes it subsided and went away. Very coincident to having swapped air filter setup so may be falsely attributing it to that. Could a change in air flow dynamics cause an issue or, or period of engine adaptation causing clanking?

Took off A and put on B:



Thanks all!

[MikeyC]

You didn't lose a little bolt or screw did you? If so it is now embedded in the top of a piston. Mind you that would be the worst-case scenario.

[a_gunslinger]

Scarey thought. 99% sure I didn't.

[Shores]

Sounds like your bike has a loose marble!

[a_gunslinger]

[a_gunslinger]

Take that back. I also removed and replaced the two bolts that the air cleaner stay attaches to on the engine. But they just came out, went back in. Not much opp to drop something in engine.

[D-Fresh]

Maybe the sound was always there but you didn't hear it with the "loud sucking sound" and now that it is quiet you do?

[a_gunslinger]

In wish that was the case, but I would recall that clank. Interestingly, when I started it twice yesterday I did not hear it. Which is what made me think it might be the engine responding or adjusting to a change in air induction volume? Presumably going from higher to slightly lower.

[Bikerron]

Uh, no.

[a_gunslinger]

Uh, no.

I was afraid of that

[a_gunslinger]

Sounds like your bike has a loose marble!

I do, so why shouldn't my bike