STUPID QUESTION: what exactly is a breather and whats it for - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat
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Performance, Brainstorming & Tuning Talk about modifications, or anything else associated with performance enhancements. Have a new idea for performance/reliability? Post it here. No idea is stupid! (please use Detailing and Appearance for cosmetic ideas)

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Old 07-08-2005, 07:42 PM   #11
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Originally Posted by willwren
Don't get me wrong, I'm not saying there'* really any benefit to it. If I put my cap back on, it takes about 5 minutes for the PCM to re-adapt for idle. And the other way around, too.

SOMETHING is different.
Try this if it still does that when you're done building it:

Hook up the scantool and put it under the hood with you
Start car
Remove breather/cap
Note fuel trims and o2mv
Place your hand over oil cap hole, forming a seal
Note fuel trims and o2mv

$0.13 says you're lean with the breather. That'* all I'll bet, not a penny more
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