Air is dirty in the first place. Some cars will not even start if TB is stuck or very dirty.

One way to prevent TB dirty is to do a PCV by-pass. U will notice 2 hoses coming from the intake manifold and cam cover, correct?

Nope. Did this simple mod for all my smart since Day 1. TB only dirty after 2 years of usage. If not, have to service TB every year.

On the engine, u will notice 2 hoses coming from cam cover and intake manifold.

U need to T both hoses together and connect to an oil catch tank (if not, dump to ground).

Refer below:



Notice the top brown hose and bottom clear hose? Previously the bottom hose was connected on the cam cover. Now, with a simple mod, u T the hoses (cam cover has 2 outlets) together and dump to either an oil catch tank or ground. Refer to 2nd image below.



Remember the bottom clear hose? It now goes to the intake pipe after the filter where the 2nd cam cover outlet used to be. Some people say better performance as intake manifold will be able to suck cleaner air directly bypassing the TB. Some say higher FC after that (in my case, yes... higher FC). If u not confident, simply cap both ends with rubber cap (a must or car may stall due to vacuum leak).

This post has been edited by acbc: Jan 16 2011, 01:15 PM

Actually, both hoses used to be transparent and they turn brown after 2 years of light usage. It shows that manufacturers chose to reroute dirty oil vapour into the intake manifold and intake pipe which will eventually clogged the TB. This is very bad for those with electronic TB (cars that have drive by wire such as Gen2 and Vios).

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

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

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