Fast ticking noise from back left side of engine bay, hmmmm

[p3u]

Any clue on what this may be? I'm almost positive the sound is not being emitted by the motor, whats back there that could make this sound, fuel pump?

I can barely hear it while driving, the frequency of the sound does not change with engine speed.

Maybe the sound has always been there, as I rarely drive without the radio off.

Thanks!

[V8weight]

Probably your N80 (evap canister purge valve), or possibly the secondary air pump. The N80 will make a ticking noise when it fails.

[p3u]

Defintely not the secondary air pump, sounds different then what I'm hearing.

Would the N80 being potentially bad effect performance in any way?

[Hy Octane]

Drivers side left or passenger side left?

[p3u]

Passenger side, back of engine bay.

[Rupert]

It's the fuel return solenoid, ticking is occasional and nothing to worry about. Circled here:

... and a green arrow - you can't miss it! :D

http://i31.tinypic.com/214wjnr.jpg

[Hy Octane]

Yep. Thats what we call the Evap purge valve here.
I had mine replaced due to loud inconsistent knocking/ticking. The replacement ticks as well, but not as loudly.