Thread: Cooling issues
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Old 05-31-2008, 07:41 PM   #10
Tru2Chevy
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Quote:
Originally Posted by IROCdan330 View Post
i'm confused? how does a hole in the y-pipe cause the car to run lean?

I understand he was told at dyno day that his car was lean or whatever from a hole in the y-pipe...but that to me would be misleading. yea, a tailpipe wideband would show lean because the exhaust would scavenge more air from that hole and show more oxygen at the tailpipe...that doesnt mean that his actual air/fuel in the combustion chamber is lean...thats why tailpipe widebands are only accurate with a sealed exhaust system and no cat.

I assume there is more info to go along with his lean condition...definitely would have that carb adjustment looked into.

And Justin, I agree, the combination of everything most likely is contributing to the situation...after those 3 things are handled, we can have a more accurate approach to any cooling issue, if one still exists.
My understanding was that the hole was pre-02 sensor....

- Justin
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