172 Ph2
When I was checking my dads 172 out today he mentioned that his makes a funny noise which he thought was the fan coming on before start-up. I asked him to show me and when he turned the ignition on (to the point before the engine fires) there was a weired noise coming from the engine bay. I popped the bonnett and it definately wasn't the fan, that wasn't moving. The noise was a weired electrical buzzing! I tracked it down to somewhere near the throttle body, possibly the black electrical box thing that's on the TB! Any ideas why it's doing this? Any ideas at all?? I'm well confused:S