I've got a 2000, Vectra SRI 150 2.2 Z22SE motor & have noticed a tapping noise from the engine. I originally thought it was a noisy tappet/lifter, but checking further, I did the old screwdriver stethescope thing & all the lifters sounded fine, until I put the 'driver on the coil pack. It seems as if the noise is coming from the coil pack itself. Is this normal or anything to worry about??
thanks in advance
cheers...Nige