2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.

atmosphere bov makes car run richer??

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Old Mar 18, 2002 | 09:32 PM
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T210thAnniv's Avatar
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Question atmosphere bov makes car run richer??

i was told that if you have a atmosphere blow off valve the car will run richer. Is this true? and also i put 7 washers into the spring cause it was sucking air in when idleing, and i put a ligther there to see if it was sucking any more, and it wasn't. Do you think it could be sucking in when i am gunning it and will it harm the engine?? ok i meant i have a aftermarket bov. its a turbo II h34 and you need to washers into it so it would be more tigher si when idle it will not suck

Last edited by T210thAnniv; Mar 18, 2002 at 10:41 PM.
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Old Mar 18, 2002 | 10:20 PM
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Re: atmosphere bov makes car run richer??

Originally posted by T210thAnniv
i was told that if you have a atmosphere blow off valve the car will run richer. Is this true?



only when the BOV is working, while shifting and letting off the gas. so it makes no difference.


and also i put 7 washers into the spring cause it was sucking air in when idleing, and i put a ligther there to see if it was sucking any more, and it wasn't. Do you think it could be sucking in when i am gunning it and will it harm the engine??
are you running the stock one into the air?? you CAN NOT do that. it if is an aftermarket one there should be a nut you turn to change the stiffness. you shouldn't need any washers...
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Old Mar 18, 2002 | 10:36 PM
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Open venting the BOV with the AFM in place means metered air is being dumped, but that air's fuel still gets injected. It causes a momentary rich condition which can cause bogging.
You have to put a check valve on the stock BOV if you open vent it or you'll have the mother of all vac leaks.
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