Clicking From Under Inlet

[Jamie92]

Hi, first post :)

Basically, my mates girlfriend has a P-reg ka 1.3, and it's started misfiring pretty badly, first things first we changed all the plugs as one was properly caked in black, more so than the other 3, to no avail.

I've heard a very loud and noticeable clicking from around injector 2 (from left to right), that happens rhythmically, probably when it should be injecting fuel.

So basically, is there anything else we could check/change and are injector faults common on these engines?

Jamie.