chris1stscooby

my 1996 wrx v limited keeps cutting out when coming to a stop it has been doing it every now and then for a while but now seems to be doing it all of the time i come to stop. ive noticed the BOV is sticking open and whilst its open it revs all over the shop once it shuts it idles fine and doesnt stall! the car had the BOV already on it when i got the car i cant see any make on it so i assume its just a cheap one!
ive just ordered a standard recirc one and im hoping that will solve the problem. has any one else had anything like this happen? was it just as simple as the BOV being **** or could it be more serious??
any help much appreciated! cheers

EngineMapper @ Group B Motorsport

BOVs that externally vent on the original MAF management system will always cause a problem to the idling and low load as they allow unmetered air in after the MAF.

Graham

chris1stscooby

so your personal oppinion of my symptoms then mate you think maybe just the original recirc will solve my probs? would it of maybe affected the maf if it has been messing up the airflow?

TIZERBOY

iTrader: (1)

Its your Maf Sensor mate,, change it then happy days....

chris1stscooby

def the maf sensor and not the BOV im not getting any fault codes though mate!
where could i get a maf and any ideas on price?

Scoobyno1

iTrader: (22)

Could also be your idle control valve?

TIZERBOY

iTrader: (1)

Give these a ring mate, its where i got mine from....


http://www.importcarparts.co.uk/default.asp

TIZERBOY

iTrader: (1)

9 time out of 10 its your Maf......

chris1stscooby

cheers tizerboy appreciated!
still hoping it might only be the cheap BOV though lol
would a faulty maf or idle control sensor cause the BOV to stay open slightly?

Turbotits

iTrader: (2)

As the bov is sticking its likely to that. As you know its faulty that has to be the first port of call

Turbo Tez

iTrader: (8)

BOV is meant to be open when engine is running.

chris1stscooby

surely it should only open to release pressure hense the whooosh?!

Turbotits

iTrader: (2)

Cant be. If it was it would be sucking air straight into the inlet system. With no boost the engine is just like a pump and sucking air in through the filter/maf/ intercooler etc. If anything at all is open air will be sucked in that isnt measured by the maf

EngineMapper @ Group B Motorsport

Every one I've seen does it, the diaphragm inside them opens the valve over the given spring pressure under vacuum and boost. That's why it causes a problem with Mafs as they receive un-metered air.

Graham

Turbo Tez

iTrader: (8)

BOV Is open on tick over and closes when you open the accelerator. It's the vacume in the manifold caused by the closed throttle that opens the VTA BOV. When there is pressure in the manifold the BOV is closed.

Turbotits

iTrader: (2)

So its sucking in metred air in then? Not that it affects me at all as i dont have one.

Turbotits

iTrader: (2)

Bloody phone lol. Was meant to say un metred air

chris1stscooby

do you not think its he BOV then turbo tez?

EngineMapper @ Group B Motorsport

It certainly won't be helping and it's the first thing to change.

Graham

Turbo Tez

iTrader: (8)

Nar mate. I'd go for MAF. Where are you based. I'm sure there must be someone local to you that could lend you theirs to help diagnose. Dump valve wise I would go standard re-circ or dump valve delete. If your near Huddersfield call round and il have a look

chris1stscooby

thanks for the offer turbotez but no where near huddersfield im affraid im in grantham. ive got a recirc ordered just waiting for delivery! can i blank it off until it arrives if so how?

chris1stscooby

just an update forr everyone that helped. fitted the recirc dumpvalve and it seems to have solved all the problems i was having with the idle. so no need for the new maf sensor!