Hi all. I have a 1.4 Corsa LE 65 plate. Since I've had the car the engine makes quite a loud ticking noise when idling... It's been taken back to Vauxhall dealership twice and they say there is no problem and one of the engineers said he could not hear anything at all. It sounds like I'm sitting in a diesel car!! It's just had it's first service since I got the car and decided to try some Hydraulic valve lifter in with the new oil to see if that would help....nothing. Does anybody else have this annoying problem? And what can I do to fix it? Thanks