My celica gt just started ticking recently. The ticking is constant with the rpms so you can hear it when its in idle, but only barely from the inside. When I actually drive the car, it ticks between 2000-2500 rpms. I have no clue as to what this could be. I read that the 1zz has connecting rod bearing problems which lead to rod knock in the car or something. So I changed the bearings and I still hear the tick. Its really noticeable in the cold, right when it starts, then it dies down a bit but then only noticeable when its under load between those rpm ranges (2000-2500ish). If anyone has had this problem or knows what it is and how to fix it, all help is VERY MUCH APPRECIATED! Thanks.