In article .com>,
"Jacob" > wrote:

> How do I determine if it has a knock sensor?
>
> I'm not sure if I should even mess with the timing. It's running ok.
> I just want to make sure it is running at it's best possible
> efficiency. It sometimes idles around 500 RPM. Seems low to me.

You better not mess with it if you don't know whether or not it has a
knock sensor. Have a shop do it.