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Old January 12th, 2018, 18:04
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Ecomike Ecomike is offline
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Join Date: Dec 2006
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Re: When does the EGR activate?

Originally Posted by jrowell View Post
If these are the only times it activates, how would the EGR affect a smog test?
If it works properly it reduces NOx emissions when it opens by keeping the engine from running too lean.

If it stays open when it should be closed it screws with, dilutes, the O2 concentration, making the ECU think the engine is running lean, and so it adds fuel when it should.


I'd have to sleep on it for a day to recall the rest of what I once knew about that answer.
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