Standard Blow Off Valve

[Race__24]

Hi guys,

I suspect i have a faulty BOV. I just have a standard item on my car at the moment and was just wondering if there was any way of checking that it's not leeking under boost

Thanks

[krzysiu]

whats it doing?

[Race__24]

the car doesn't seem to be making boost as quickly as it was a month or so ago. And i can here it activate at low boost but when the boost gets up a little i can no longer hear it, but i can hear a hissing sound under acceleration.

[predator]

might not be BOV.. could be a vacuum leak from somewhere else. I'd suggest getting out, and giving it a couple of quick revs. Sometimes if its bad you can even hear where it's coming from. Otherwise, feel your finger around the vacuum hoses whilst doing revs (carefully obviously), and see if you can feel anything.

Usually as its fairly pressurised, it will be easy to feel..

[TTT]

most commonly a vacuum leak.

the rubber hoses in the engine bay are old.

start looking at the obvious.

the BOV vacuum line.

the boost gauge vacuum line.

I know that after taking mine off and on about 5 times, the line split.

cost's less than $2 for a replacement so don't be too worried.

[Steve]

If you suspect its the BOV, try blocking it off with some plate BOVs are overated anyway

Well worth while checking lines, but the fact that the BOV lifts at lower boost, but not at higher boost doesnt seem to follow the normal leaking vacuum line symptons that I have seen and experienced.

[Race__24]

Thanks people, I'll be having a good look under the bonnet tomorrow. Hopefully it's just a vac line, fingers crossed.

[sproosy]

With the standard BOV if you think its the problem you can put a 20c peice inside of it to block it off. A friend of mine did this because he fitted an aftermarket BOV, it worked fine and now the aftermarket BOV is really loud and gets him defects all the time. Hope you fix it dude!

[WazR32GTSt]

if it were a vaccum leak, then surely it would pose other idling problems?

if its a BOV leak then it will only be affected under boost (obviously).. if you put the car on a dyno you could easily work out if its a bov leak, as the bonnet will be open in your face at full boost . or alternatively, as has been said, just block off the bov return line and see if there is any difference in power

cheers,

Warren.