errr
dont have any intention to flame ppl
but car manufactor reroute the oil vapor to intake manifold due to the emission and enviromental issue
in old day the oil vapour are release to open air but this were demed to dirty thus later they plug to manifold and it suck to the combustion chamber and were combust away
trade of it is gum,oil residue were left on the whole intake system lo

Correction, for environmental and money making process. By clogging the TB, u will have to pay for replacement fast. Good for service centre.

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Added on January 20, 2011, 2:31 pmThat one is a problem inherited from Mitsubishi. Till now, they never figure how to improve it. Many mechanics resort to cut and paste parts from Toyota to solve this nagging issue.

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Added on January 20, 2011, 2:32 pmSame goes for Myvi. All driven by throttle cable. Good and bad.

This post has been edited by acbc: Jan 20 2011, 02:32 PM

So is that to say that Toyota cars are more resilient to dirty throttle bodies by virtue of their design and parts?

TS, Can you tell us what are the "Current Cars" you talking about?

During combustion some of the fuel may travel backup to the valves, this may include the throttle body valve, when the engine cools down, these fuel harden and sticks on the valve & body, becomes carbon. As such you get buildups. And since only air travels tru the body, there's no cleansing agent, as such the clogs remains there and builds up more & more til one day you have insufficient air and affects the car performance.

Not sure about old cars because they use carburetor have air & fuel mixed inside as such cleansing agent added into the petrol tank will wash some of the deposits away.

For Direct Injection Engines, these problems are much worse, e.g. newer Audi, Lexus, Volkswagen engines, as they utilize Direct injection, fuel don't even passtru the air intake valve, as such the air intake valve which directly connect to the combustion chamber will suffer more of this problem, since it's next to the combustion chamber, the force is higher and fuel will backflow to the air intake valve faster than Throttle body, and more severe clogging happens on those engines, and since air intake valves are smaller than Throttle body valves, the effect is much worse for DI Engines. Cleaning the valve every 20k km is normal as they build up much faster than non direct injected engines.

all think until so complicated for what??.. its the air filter not filtering the air 100% efficiently laa... surely there will be some dust passing through it at high revs....

If Dirty Air goes in it'd go straight into the combustion chamber, it may stay inside the chamber but it won't stuck in the throttle body like gum and end up getting bigger & bigger becoming deposits will they. Unless it's oily air getting in.

No. I'm saying Toyota have better tech in solving this aging old infections Mitsubishi problem.

This post has been edited by acbc: Jan 21 2011, 09:29 PM

Aiya use carb la no fancy stuff so no headache but no fancy fc and no fancy refinement lo . No free lunch in this world

If u don't want to worry about TB issues, buy a diesel. Even carb have TB issues also just lesser.