Carbon canister valve

[Alistair E]

Changed the after run pump on my 94 ABY avant last night. While I was waiting for the car to warm up after fitting the pump, I decided to have a listen around the engine bay. For quite some time I have had an annoying ticking coming from the engine and have always put it down to the injectors.
However, it would appear that this is not the case. I eventually tracked it down to the carbon canister valve. The ticking is so loud that I can hear it in the car while it is idling. Would someone tell me is this normal? Is it a fault with the valve and does it need to be replaced? Is there a method for checking it? And lastly, if it should be replaced, roughly how much is the part?

Thanks in advance

Alistair

[Greg_S]

Alistair, also check the bomb. Mine ticks when on tickover or when driving along. if you hold onto the copper pipe you can feel it pulsing

[newsh]

It ticks when idling to apply inlet manifold vacuum to the canister. Sounds loud though, is it resting aganst something hard?

If it leaks you'll get a boost leak into the PCV system. You could take it off and try to blow through it or test it with a mightyvac?.