Hi,
I've got a loud (audible while driving with the radio off) ticking noise coming from the engine of my V6 cavalier. It sounds like an injector, only louder... I used to get the noise for a few seconds after starting from cold, but now it seems to come and go as it pleases. The frequency of the tick is proportional to engine speed.
Could it be an injector? If so, is it anything to worry about? If not, what else could it be (hydraulic valve lifters have been suggested, but I don't know if I have those!).
Car's a 1995 (M) and done just under 140,000 miles.
Thanks in advance,
Iain