Cannister Purge Valve?

justmicky · 9th February 2009, 09:56

My car has been idle for the last 3-4 weeks while I have been away. I fired her up this morning and she sounded a litlle bit "rattly". It wasn't tappets, and upon further investigation the noise appears to be coming from the Cannister Purge Valve. Would this be normal under these conditions at this time of year or is there a problem looming? I can't say I have ever heard this before, but then again I haven't had the car laying as long without use before.

T-Cut · 9th February 2009, 10:39

Quote:

Originally Posted by justmicky

- - - the noise appears to be coming from the Cannister Purge Valve. Would this be normal under these conditions at this time of year or is there a problem looming?

It's quite normal and isn't anything to do with the cold weather. The petrol vapour recycling system operates automatically whenever the inlet manifold pressure is suitable for drawing the fumes from the rear cannister. You typically hear it operating when stood at tickover. It can be very disconcerting when you first hear it. It's much like a tappet gone bad.

Quote:

I can't say I have ever heard this before, but then again I haven't had the car laying as long without use before.

I'm not aware of any time factor, but it's possible that the cannister has to be saturated to trip the system. I'm unclear how it's switched on. Whatever, everything's perfectly normal.

Perfectly normal!

T-Cut · 9th February 2009, 10:41

Double post, sorry.

justmicky · 9th February 2009, 16:59

Cheers, thanks for that.

9th February 2009, 09:56	#1
justmicky I really should get out more....... Rover 75 Saloon 1.8 Club SE Join Date: May 2008 Location: north west Posts: 2,160 Thanks: 0 Thanked 1 Time in 1 Post	Cannister Purge Valve? My car has been idle for the last 3-4 weeks while I have been away. I fired her up this morning and she sounded a litlle bit "rattly". It wasn't tappets, and upon further investigation the noise appears to be coming from the Cannister Purge Valve. Would this be normal under these conditions at this time of year or is there a problem looming? I can't say I have ever heard this before, but then again I haven't had the car laying as long without use before.

9th February 2009, 10:41	#3
T-Cut This is my second home Rover75 and Mreg Corsa. Join Date: Nov 2006 Location: Sumweer onat mote o'dust (Sagin) Posts: 21,753 Thanks: 341 Thanked 3,660 Times in 2,924 Posts	Double post, sorry. Last edited by T-Cut; 9th February 2009 at 18:38..

9th February 2009, 16:59	#4
justmicky I really should get out more....... Rover 75 Saloon 1.8 Club SE Join Date: May 2008 Location: north west Posts: 2,160 Thanks: 0 Thanked 1 Time in 1 Post	Cheers, thanks for that.