* 4-cylinder engine: Cylinders are numbered 1-4, typically from the timing belt/chain side to the opposite side.
* V6 engine: Cylinders are usually numbered 1-6, but the arrangement is in a 'V' shape. The specific firing order and arrangement would need to be looked up in a repair manual specific to that engine (e.g., 1MZ-FE). The numbering isn't always straightforward left-to-right.
To know the exact cylinder numbering, you need to consult your owner's manual or a repair manual specific to your 1999 Camry's engine. The engine code (found on a sticker under the hood) will help you locate the correct manual.
