so i was at mcdonalds yesterday and as i revved up my engine i heard this ticking noise tapping noise it was a weird noise and never heard before and my car was pretty warm was driving it for bout 1 hr .. i was wondering what this might be it already had a ticking noise i thought it was from a injector but now it has 2 just wondering what it might be ... could it be anything to do with the timing belt? i have 98,000 miles on it and yea thanks for your help