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)

How much is a 2002 Ford Focus with salvage title worth?

Hi, my friend is selling a 2002 Ford Focus with 160,000 miles on it and a salvage title. She's selling for $1,000 does anyone know how much I could get out of it if I resell? Car works fine. No severe body damage. She just needs the money

I don't know what's wrong with my car?

So when my car wouldn t start I took it in and it turns out it was the starter. The guy fixed it and everything was cool. But when I picked it up it made a weird noise and sounded like it wanted to turn off so I let it run for a little bit and everything was good. The tailpipe had alot of smoke coming out of it also but my uncle told me that was because they had to remove it or something. But anyway I drove home (which was an hour and a half away) and I didn't have any problems, it was running better than it ever has before. But when I got up this morning to drive it it made a weirder noise and I didn't think it was going to start but it did. It just sounded extremely weak and more smoke was coming out of the tailpipe. I made it to school but I'm so scared to drive it again. Should I just let it run for a minute before I drive it? I don't know some advice would be greatly appreciated. Thanks in advanced.

Added (1). 2002 Ford Focus, i don't know what engine but people tell me it's a difficult one and that it has 2 motors. White smoke. But last night it eventually stopped. And 1.7k miles. And it's not the head gasket I got that checked already.

Mark 3 (2012) Ford Focus fuel economy concern? - 2

According to Ford, the 2012 Ford Focus 1.6 ti vct (petrol) should do 35mpg around the houses (i.e. Urban driving). However I'm only getting 27 or 28mpg! Even if I do one longer journey per week (40miles) I only get 32mpg. Is this normal and do you know anyone with this model who has the same experience?

What does this mean please? - 1

In my Ford Focus owner's manual it says "Oil expands when it is hot. The level may therefore extend a few millimetres beyond the MAX mark." If I were to check the oil 10 or 15 minutes after turning the engine off, would the oil still be "hot" and hence have expanded a few millimetres above the max mark? Or does this only apply if I were to check the oil level immediately after turning the engine off? In other words after 10 or 15 minutes would the engine have cooled enough for the expansion to not apply?

2015 Charger SE or 2016 civic?

I'm looking to buy a new vehicle. I have been driving a 2013 Ford Focus for the past 3 years. It has been a pain in my ***. Constantly taking it back to the dealer for transmission issues. Not fun to drive either. I'm looking at a v6 charger for decent gas mileage and the 100k warranty. Plus it would be a commuter with 300hp. Sounds like fun. The other option would be to pick up a 2016 civic base with the stick and look at a few mods to give it some more spice. What would you fellas recommend? (I'm a 20yr old male). If y all have any other suggestions shoot them my way.

Can I increase my tire size by 1 inch?

Right now my car has P205/50/R16 tires. I want to buy some new rims and tires and I was was wondering if I could upsize to 17 inch rims and tires. If so, what size tire would I have to go with so it doesn't interfere with my speedometer? I have a 2005 Ford Focus ST

What does this mean please?

In my Ford Focus owner's manual it says "Oil expands when it is hot. The level may therefore extend a few millimetres beyond the MAX mark."

If I were to check the oil 10 or 15 minutes after turning the engine off, would the oil still be "hot" and hence have expanded a few millimetres above the max mark? Or does this only apply if I were to check the oil level immediately after turning the engine off? In other words after 10 or 15 minutes would the engine have cooled enough for the expansion to not apply?