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What is the Iac? 200

posted by  someone claiming to be Rhys on  Thu Jan 29 13:24 CST 2004 [RELATED]

Bob it's true in North America that CIS does stand for Constant Idle Speed. When Bosch first used the term in the 70's though, they intended it to be the English term for what they called the K-Jetronic system. In German, it is spelled "Kontinous", hence K-Jet, with "CIS" meaning "Continuous Injection System". When OBD II systems came out, the terminology was also standardized, so Bosch was told not to use CIS to describe their fuel system, as that acronym was to be applied to all cars as constant idle speed. Now it seems that IAC has superceded it.
More info than the topic warrants I suppose.
I think the electronic part you are referring to must be the frequency valve, which no Canadian market B21 or B23E engines got, only the American market cars. Other engines using K-jet did get frequency valves, like the B27, and VW and Mercedes in the Canadian market.
It is confusing!






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