First - I've merged ALL of your threads relating to this issue into one.
Moving on ...
i just googled, its mpi engine / multy point injection
A Google search will produce information that is not necessarily correct - the 1.2 Swift has been built with several different versions of the K12 engine, some of which are port injected, some of which are direct injection - WHAT does YOUR car have?
What I say below is largely applicable to the direct injection engines.
the outside of the injectors. im not expert in mechanics but i saw the injectors they look like long pencils on the bottom they were clear, but everything other was with carbon build up
You can't see the inside of the injectors, and my question was poorly worded, it was more about which part of the injector you were looking at - I don't see how carbon can build up on the body of the injector, where would it come from? how would it get there? Dirt & oil, to some extent would be normal. If the injectors were removed from the engine you might be able to see the tips, the part of the injector that goes down into the intake ports, if it's a port injected engine, or the combustion chamber if it's a direct injection engine.
Generally speaking on a port injected engine the tips of the injectors would be relatively clean, direct injection engines are a different matter, and this is why I asked about the engine - the tip of the injector is directly in the combustion chamber and carbon build up IS an issue, fuel quality IS an issue, and so that it is clear, I'm not referring to octane rating here, direct injection engines require a fuel with a high level of detergents, what is known in the trade as a "top tier" fuel, they also require a higher level of maintenance than a port injected engine and a periodic "induction" cleaning, which is why I will not buy another vehicle with a direct injection engine.
30,000 kms is a relatively short distance in which to have a direct injection engine develop enough carbon build up to cause a problem, but depending on the circumstances it is possible - as mentioned before, fuel quality is a critical factor, usage pattern is also critical, if that vehicle is left idling for long periods, you'll get carbon buildup occurring with no movement being registered on the odometer, if the vehicle is frequently primarily in heavy traffic, there will be carbon buildup with low mileage being recorded.
We still need to know if your engine is direct injected or not, if it's port injected, then the discussion changes.
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