How do you know which engine cylinders are 3 4 you want to replace the coil packs on your 2000 Toyota Avalon?

Answer 1

I don't have specific knowledge on this vehicle. But typically, an engine numbers the cyclinders either clock wise or counter-clock wise looking down on the engine block.

You can then Google the firing order of your vechicle and match that to the order in which the sparkplug wires are ordered on the coil.

After this, you should have some idea on the cylinder 3 location.