Pinging noise on 98 civic after valves ajustment
 

Hi all, I recently replaced timing belt/water pump on my wife's 98
civic. I also ajusted valves clearance as well. After taking the car
for its first ride, my wife complained about a pinging noise that I
immediatly validated. I checked back the belt job - everything was
fine. I also did the valves clearance ajustement another time to make
sure everything was done well. So it is.

What happened here? Any help will be greatly appreciated, thanx.