Can i change the spark ignition timing?

My Ford focus 2 (europe) 2007 has a knock in the engine but not that of a big noise, it is like blowing a kiss with that sound from your lips, sorry for the unspecific description for the sound
i went to the mechanic he started telling me that i need to put higher octane and the fuel is not burnning well because the octane ratio in your fuel is not enough so i went to put the higher octane and the knocking still there
i started to get confused as i don't know anymore what to do about this problem, i can't even detect my problem all i know is my fuel is not burnning well in the pistons
i got an OBDll and started dignosing the car for faults, None were found
i asked alot then for what is my problem and how can it be fixed and i concluded from all the answers i got My question about the spark ignition timing
Is it even possible to do something like that?

Added (1). Can i change the spark ignition timing?(I don't have my owner manual)

Yes, but there's a specification for the cars timing, and you need a timing light and the expertise to use it. Timing is changed by rotating the distributor.

Nope. The timing is completely under the control of the engine computer - You can't touch it.

You are going to damage your car trying to fix it yourself. Take it to a mechanic -- someone who knows what they are doing, which isn't you.

http://autorepair.about.com/

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