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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 11-11-2004, 08:46 PM   #1
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Default Got an oil breather?

This was wild. For well over a month now I've been chasing down a lean at idle problem. At idle the o2 mv would dance around 20 (VERY lean). I replaced the fuel pump, cleaned the injectors a second time, replaced filter, blew out the lines, all with no luck. I spent countless hours pulling everything back off and retightening things, replacing lines, everything I could think of and again no luck. So today I was doing the usual hunt for a vacuum leak when I got frustrated and yanked my oil breather and put my palm over the hole. INSTANTLY the mv went from about 20 to 1100. hooolllyy craaap. Ran and grabbed a new oil cap, slapped it on there, and now it runs perfect! Who knew?? The odd thing is I've had it on there for a long while, and the idle issue only seemingly just came up more recently...oh well, seems to work for now hopefully it lasts
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Old 11-11-2004, 09:37 PM   #2
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Me too, Doc! When I put my breather on for purely cosmetic reasons, I observed the same. My idle changed (after re-learning, it was for the better), felt more power, and the car runs more efficiently.
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Old 11-11-2004, 10:15 PM   #3
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Huh? A breather cap or a new stock filler cap?
I've been running my California Custom'* breather cap on my B-ville'* for the past 16 months. Didn't think it was much of a benefit beyond eye-candy.
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Old 11-11-2004, 10:16 PM   #4
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Yeah i'm talking oil breather cap....obviously made mine run really lean at idle
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Old 11-11-2004, 10:23 PM   #5
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Is that the thing that is like a small air filter where the stock oil fill cap is?

What are the purpose of those things?


-justin
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Old 11-11-2004, 10:26 PM   #6
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I dont know but whenever I think about buying one they arent screw on types, just filters with the tiny hose at the end of it which wouldnt fit.
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Old 11-11-2004, 10:42 PM   #7
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does that mean you've got a lot of blowby?
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Old 11-11-2004, 10:58 PM   #8
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I'm pretty sure that there to relieve crank case pressure when you disable your pvc.
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Old 11-11-2004, 11:01 PM   #9
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As long as you have a functioning PCV why would one need a breather? Not doubting it helped you, just curious.
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Old 11-11-2004, 11:15 PM   #10
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My pcv is new
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