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Old 06-11-2009, 08:07 PM   #21 (permalink)
stevey_frac
EcoModding Apprentice
 
Join Date: Jun 2008
Location: Cambridge, ON
Posts: 240

Jalilah - '07 Chevrolet Cobalt LT
90 day: 40.57 mpg (US)
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Quote:
Originally Posted by brucepick View Post
not enough exhaust in the intake air??
Hmm. Does it have EGR that pulls from post-cat converter?

Even aside from the intake air bit, I'm sure that the leak just aft of the cat messed up the O2 readings. And I bet that leak was building for a while and finally became clearly audible.

OK, I have to admit to CRS syndrome; I'm now past 55 and I don't mean mph. I"m PRETTY sure I ran it for about 40 mi. with the grill block back in and had trouble keeping LB. But I will put the lower grill block in for tomorrow's 60-mile ride up to work and we'll see how it goes. No inconvenience at all - it's sections of foam pipe insulation bundled together to fit the grill openings. Easily removable and reinstallable.
CRS syndrome?

I'm was thinking the leak was dropping exhuast pressure, and this was causing EGR action to slow down, and throw things off. Didn't think about a post cat O2 sensor. Perhaps I should just stick to code? :P

Either way, try 'er and see!

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