Hello everybody !
My name is Michael and I am the owner of a 1.6 ti-vct '05 Focus. I have owned it since summer '09 and I'm thrilled with it, except one small issue that I can't really get rid of.
When I first took it into service for oil and filters changes, the mechanic used a type of oil that wasn't suited for my car. After that, my car started making a noise at start up, especially in the summer and with a warm engine (which was diagnosed by another mechanic and after another 2 or 3 oil changes has disappeared almost completely) and a small hesitation / trembling of the engine in the 1800-2000 rpm range in 2nd and 3rd gear. It's a slight hesitation, you can't really notice it if you aren't expecting it, but I'd like my car to run smooth through the entire rpm range. I haven't managed to find out the cause of this issue, even though I went to a lot of mechanics and sincer I'm taking my car into service next month for cam belt and auxiliary belts replacement, I'd thought I could solve this issue as well.
I'd appreciate any tip or piece of advice you could give me. Thanks in advance.