I can hear this POP noise

[MsG_ChRiS]

lately when i am driving i can hear a poping sound when i step on the clutch to change gear???

it only happens sometimes and its fairly quite ... could it be backfiring ???

the only thing i can think was someone telling me it had something to do with fitting the blow off valve would this true??? <--- something about the a/f ratio being a lil rich because of the valve venting air away from the inlet and dumping the subsequent unburnt fuel on the turbine???

if this is the case is this a bad thing???? :kick:

[someonestolecc]

If you recently fitted a BOV and this wasn't happening before and it happens when you back off (not use the clutch) then yes.

If it's actually the clutch then it might be coincidental but to do with that

[Cubes]

Chances are it is caused by the BOV.

This is one reason why the EPA have put a big black cross next to atomo bov's.

If mr. police man see's you have an atmo bov you will be defected.

The atmo bov's can also cause stalling due to the fuel flooding the car.

It also reduces the life of your cat convertor.

While atmo bovs are good for venting away the old dirty hot air, the fuel dump is not good for the bores. Good for running around a track flat stick as it cools everything down but for general driving bad.

Excessive fuel in your bores can wash the oil from them and cause glazing.

But in reality I don't know if it really is enough to glaze the bores. When you glaze the bores the car tends to use/burn a little oil.

[Cool Hand Luke]

When i changed to my atmo venting bov i found it popped on off throttle and some gear changes, especially when the exhaust was hot.. Its just pumping excess fuel when the bov opens as the afm see's a lot of air coming in, but the bov is venting most of it out, hense why you'll get black soot up the back of your car and why in all honesty i shouldnt've changed to one

[JaFF]

So there is not much point in having a atmo bov?

Mines had one since I got it but I also have the standard one. My car goes through a tonne of petrol and backfires all the time when changing gear. I didn;t realise this was due to the bov.

Should I go back to the standard or get a new better bov?

[LANFOH]

Yep itll be your BOV mate. Just get it plumbed back to your inlet in between your turbo and air flow meter. Running rich for that split second is also no good for your spark plugs.

[MsG_ChRiS]

CoOl thanks guys

ummm ive got a stealth fx so i'll think i will tune it to vent some air back to the inlet rather than have it on full blast that should fix the prob =)