Kia Carnival 2004 Problems

THOUGH the engine is a 2.5-litre V6, it's still a small unit for such a large vehicle. Being used to a V8, you may be using too much throttle. Look at your driving style, and make sure you aren't carrying unnecessary weight. Also, make sure your tyres are properly inflated. I'm sceptical about the gadgets. It's impossible for the average person to establish whether the maker's claims are true. Unless they can show valid test data from an independent source, I wouldn't believe any claim they make.

It is likely that there is a head gasket problem; it was a common issue with the early Carnival. Buying a secondhand engine is inviting trouble. It could also be struck down with the same problem and you could find yourself back in the same situation. I would be doing the head gasket rather than buying a secondhand engine, that way you know it is fixed.