hello there my engine on my 2008 vectra sri xp2 150 cdti with 54k has a ticking and taping to it iv had vectra c since 2006 and all there engain were quite but this one it loud more on idle from cold then at full temp iv done all the follwing:

egr clean new gaskits
boost clean
trottle body clean
stp treatment
fully serviced
timeing belt was done at 43k
no codes on ecu

plese help drivng me crazy thanks