Egr valve. Options

[monky322]

Hi, Guys! i've been searching in the forums about the EGR valve, because my engine light came on and in autozone, the guy told me that my EGR valve was the the cause. So I live in Florida, so not emissions tests are required by law; my question is about if the EGR valve malfunction would have an impact on the MPG. I read a tread about the EGR valve not having an impact on my miles per gallon. Somebody said here that only the new oxigen sensor and a tune up can improve our MPG. I am asking because my MPG are a little poor right now so i was thinking that my bad EGR valve might have something to do with it.

thanks for your replies.

[monky322]

Well i just found this in one of our treads here at 6GC




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QUOTE (Kwanza26 @ May 9, 2010 - 3:41 PM) *
All the stuff about fuel economy at cruising speed is irrelevant to the EGR system. Learn how it works before you go off on a tangent.


That raises a question for me - and it sounds like you can answer it/clear it up. I thought the EGR only actually came on at cruising speed (i.e. about 50 mph). So my question is, how would a faulty EGR affect stop-and-go driving if it doesn't activate until you hit 50?

Reason I ask is that I've been fighting with my friend's EGR on his Prizm (4AFE). We had to get it through DEQ, and after replacing the EGR w/no luck on the CEL, I finally just took it to a parts store and had the CEL reset, at which point we drove it to DEQ (about 6 miles) and kept it under 40 mph so the EGR wouldn't trigger and the CEL code would stay clear long enough to get it through DEQ. (Illegal, I know. Desperate measures, ya know...)

In his particular case, the CEL or bad EGR hasn't affected "performance" or gas mileage at all. I know on other cars though, a CEL would throw it into "safe mode" and make the car run like crap and get horrible mpg. Does this just not really apply on our particular cars (or variations thereof)?