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[Tick Tock]

I'm just in the process of cleaning and servicing the breather system on my 2.5 V6 - many thanks to Fuse19 for the guide and explanations.



This item is fixed to the side of the breather box, and looks like some sort of solenoid valve. The inboard port which hosts the rubber pipe which goes to the breather bridge was full of crusty dried crud, now cleaned out and easy enough to blow through. The other pipe disappears into the O/S wheel arch and beyond.

Out of interest and a better understanding, please can anyone tell me what it does and where the pipe goes to.

[Doctor Gollum]

Purge valve... Pipe actually comes from the wheel arch... Where there's a catch tank to collect fumes from the petrol tank.

ECU then opens the valve periodically

[Tick Tock]

Thanks for that.

So as I can blow through with it off the car, does that mean it's energised under normal conditions so that no purge can take place?

[Doctor Gollum]

Couldn't tell you

Does it blow through both ways?

[Tick Tock]

Blows through both ways here on the bench.

Always interested to learn more about these cars, rather than just throw it back into the engine bay and forget about it.

Any other thoughts most welcome, but does seem strange that it's open in an un-energised state...... and why would you wish to purge fuel vapour? from the tank into the breather system?

[Tick Tock]

Ok, can't seem to edit the title of this thread to Purge Control Valve

Now that the kind Dr Gollum has confirmed what it is we're discussing here, I've done some research and understand what this device is supposed to do. The fact I can blow both ways through it would indicate there may be something wrong, and according to the information I've come across, if the valve fails in the open position, it's possible / probable that the engine management light will illuminate (or at least that's what it does on some cars).

Prior to removal, the car was working fine, and will hopefully work when I've put it all back together. There's been no indication of the engine management light apart from when the ignition is turned on initially.

What I'd like to know is -

Am I fitting a faulty valve back on to the car?
How will the ECU know if the valve is faulty?
Will the purged vapours continue to enter the breather system uncontrolled?
Does anybody care? Is this just a gimmick?
 

[biggriffin]

Ok, can't seem to edit the title of this thread to Purge Control Valve

Now that the kind Dr Gollum has confirmed what it is we're discussing here, I've done some research and understand what this device is supposed to do. The fact I can blow both ways through it would indicate there may be something wrong, and according to the information I've come across, if the valve fails in the open position, it's possible / probable that the engine management light will illuminate (or at least that's what it does on some cars).

Prior to removal, the car was working fine, and will hopefully work when I've put it all back together. There's been no indication of the engine management light apart from when the ignition is turned on initially.

What I'd like to know is -

Am I fitting a faulty valve back on to the car?
How will the ECU know if the valve is faulty?
Will the purged vapours continue to enter the breather system uncontrolled?
Does anybody care? Is this just a gimmick?

If the car runs fine, if it ain't broken don't fix it.

[Doctor Gollum]

Could it collapse the tank?

[biggriffin]

Could it collapse the tank?

Only if it jams closed,. Very rare. Would assume it defaults open.