ticking noise, worse when cold...rings?
Mate of mine was complaining about his 735i being very 'ticky'. I helped him adjust valve and all were set pretty well but we did them anyway. On restarting the car the loud ticking was still there, but seemed to diminish as the car warmed up. I initially through that the valvetrain was probably worn. Tried unplugging injectors one at a time just for kicks and when we unplugged #3, the ticking went away, like completely dissapeared. Did not do a compression test but every cylinder made the car run just as rough when it was unplugged, however, #3 completely stopped the ticking also.
I am thinking either piston slap or maybe rings??? Its definately not valve clearance. Exhaust manifold does not appear to have leaks or cracks. Its not really a slap kind of noise, very much metallic ticking like a top end noise. Car runs perfect otherwise, no smoke, oil consumption etc.
Advice would be appreciated.
