Wasalam,
I got 2006 Vitz, bought in 2013 and since last year I am facing more or less similar issues which you have mentioned. Prior to that, my Vitz did justice with my purchase Alhamdulillah.
I have driven more than 50K since I bought currently ODO meter is at 88K, took it on longer routes couple of times and Alhamdulillah it never disappoints me.
However, there are some instinct problems with Vitz such as loud engine noise, low fuel average and Vibration.
On suggestion of @capsat I went to a mechanic in Karachi, who has resolved much of the problems I was facing, the annoying noise from Steering Rack has gone after I got it replaced last week.
The vibration was one big concern for me, I got my car tuned couple of times, did throttle body service, changed spark plug but all this couldn't help until recently I got its fuel injector cleaned, and now Alhamdulillah no vibration at all.
There are still 2 problems, firstly fuel average is very pathetic I am getting 7.5 to 8 km per liter in city without AC looking to figure out this now.
Secondly, there is a lot of cabin noise when I drive my car on bumpy road, the dashboard and seats is making rattling noise, don't know how it fix this. Should I get it detailed (interior cleaning)? any help in this would be appreciated.
@pwuser151461545062 Contact me if you need number of the mechanic.