Blow off valve not making sound
 

Hi everybody,i'm new to tis club and hope i can get all the information i need here form all of u seniors members.I have a prob with my blow off valve as it doesn't makes any sound when i decelerating and air sound only came from my turbine.Can anyone here please help me as i've looked in the noob thred and i dun seem to get any info.

losen the adjestment bolt on the back of the bov.

adjust the bov bolt with the engine running at idle. keep loosening the bolt till you see the bov open. when you see the bov open then tighten it a little more so its closed at idle. then test drive and enjoy the noise.

Hi guys,i've been using tis bov for quiet sometimes n all out of sudden it doesn't work.i've juz borrowed a turbosmart supersonic bov from a frenz of mine to try out n it still doesn't work n tis bov i borrowed is a working bov fr his car.Any of u seniors in here have ever encounter tis problem please give me some idea wat d caused of tis.Tq

check your vacuum lines to the bov.

^ agreed. If you know the valve is functioning, and you are building boost at your plenum, it's gotta be the signal.

Hi guys,i've checked the vacuum hose n i can feel there's suction available n tis is making me very confuse.I'm totally wandering wat else can be the caused.Pls help me if any of u have ever encounter other causes d bov not functioning beside faulty bov n vacuum leak or no suction.

feel??? you need to measure the vacuum with a gauge. does your bov open freely? theres a seal in the bov that can stick. also the diaphram in the bov may have a small leak. the only way to find this out is by purchasing a vacuum gauge tool. there pretty cheap. u can get them at pepboys, advanced auto parts, etc.

Thanks busa4 for d advise n i'll try to get a vacuum gauge 1st n test.

Does the BOV vent to atmosphere or re-circulate? If you are boosting you should have a gauge to monitor, are you sure you are actually getting into boost? A large boost leak somewhere in your system may be preventing you from boosting, and not producing enough pressure to open the BOV when your throttle plate snaps closed. Buy or make a pressure testing kit and find & fix any leaks. If open atmosphere type, while idling, reach in w/ your finger and see if you can easily push the plunger and open the valve, air should rush out. If you can't take the BOV apart and clean/possibly oil/grease a little to ensure smoothe operation. Some BOV's don't have an adjustment bolt, you need to unscrew the BOV and add/remove washers to tighten/loosen the spring. My bet is a large boost leak and a tight spring.