breather cap

r_suh

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hey guys i got a quick question. i was curious to know if anyone has a breather cap instead of an oil cap. My question is if you use a breather cap can you take off the short hose just under the cap thats also connected to the air intake?
 

G_94_T

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Just going off what ive seen on the 'net....a breather cap on an EFI car is a no-no.....it will fool the computer into thinking there's a vacuum leak
 

Eastcoast5.0

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I have a breather on mine, no problems what so ever. Yes take that line off, just plug the hole in your CAI or whatever intake you have on it.
 

JTEarp

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Is there any particular breather cap that is recommended? Thanks.
 

Lightning Struck

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damn its been so long I cant remember what kind I had on my 91 :-\ :-\ :-\ I want to say it was a K&N ??? ??? ??? do they make them..............damn I'm getting old I cant remember crap :( :(
 

ryclef331

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G_94_T said:
Just going off what ive seen on the 'net....a breather cap on an EFI car is a no-no.....it will fool the computer into thinking there's a vacuum leak

he's right. the car may run fine and all but you may start to notice idle issues with that setup. The PROPER way would be to plug the PVC system. Look at it this way. The intake manifold is connected to the pvc with obviously is connected to the crank case. The crank case shares the same air with the lifter valley and under the valve covers. The valve cover is vented into the inlet elbow of the factory intake. NOW, when you slap a breather onto the filler neck, you just opened that seal system. The PVC no longer has "suction" on the crank case so you just botched that system. You gain NOTHING NOTHING by doing this. IF you have oil in the intake, its normally pull in through the PVC. You can installed an air/oil seperator for under 20 bucks.

Either way...IF you go with breathers, you need to block off the PVC completely. Its one or the other.
 

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