Engine timing is done electronically. It is based on Cylinder 1 being a few degrees before TDC (Top Dead Centre of firing stroke).
Valve Timing is set using marks when you change the timing belt or chain. That is set with Piston 1 at TDC on FIRING stroke.
Here is the firing order. It is nice and easy, 1, 2, 3, 4, left to right.
https://www.google.com/search?q=2007+suzuki+forenza+firing+order
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