Cold engine makes mechanical noise
I have a 2004 Insight CVt with about 80,0000 miles, bought used about 18 months ago.
When I first purchased it, I noticed that the engine made a bit of noise when starting in the morning, and I don't know if it has gotten worse, or if I have just become more aware of it lately.
I owned a 750cc motorcycle once that developed bad piston rod bearings, and would knock when the engine was cold, and this doesn't sound quite like that.
It could be though that the motorcycle was air cooled and this engine has water cooling and maybe it is dampening the sound a bit??? But it doesn't sound like what I remember a rod nock sound like. It also seems a bit slower than idle speed would suggest.
Other canditates are piston slap and some kind of valve gear noise. I had the valves adjusted about 6 months ago though, and maybe that is when I started to notice it more. Just don't recall.
I am not at all sure what piston slap sounds like, and the sound MIGHT be at the same speed as the valve train because it doesn't sound that fast as compared to engine RPM.
When the engine warms up, the sound appears to either go away completly or become too muted to hear over tire noise. When the car is sitting at idle, if I open the hood, I hear mechanical noise, but having owned other Hondas, it doesn't seem to be more or less than a typical small Honda car engine at idle.
I guess I wanted to get others to tell me if their engines are a little noisey at startup and exibit the same behavior, and if this is just normal wear.
Any thoughts would be appreciated.
BTW, the car uses no oil, I get between 55 and 65 MPG in normal running around, the engine pulls fine, and in all other ways seems to run perfectly. And when it is warm, you don't hear the noise. Maybe for the first 2 or 3 minutes then it starts to quell.
Thanks!
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