Whenever it's cold outside (30F or below) my engine makes a metallic rattling sound when I start up the car. It almost sounds like a diesel engine (but on a smaller scale). It's not real loud but goes away when I take the revs past 2000. It completely disappears after the engine warms up. I've heard a crack in the header can cause this but have visually checked it and I see no cracks. It's actually been doing this for the past 3 or so years but I guess I got used to it. Anybody got some advice?

 

Honda engines can be a little noisey durring cold start up. The noise comes primarily from the valves. A valve adjustment would most likely quite the noise down considerably. It's good practice to get the valves adjusted every15 to 30k. Nothing to loose sleep over.

 

got the same thing. get used to it. like he said, honda motors are like that.

 

I have the same thing when the engines cold, but when it warms up it goes away.Pretty much normal i think..

 

Ummmm, I understand your reply, but what in the hell is with that picture??

 

No ****! Haha...it was funny though, just seeing the randomness in it!