Any idea's what is making a odd noise. it sounds like someone tapping a small drum. 1 tap. Happens hot or cold. Turn off engine and 3 seconds later a thud.

Edited 17 December, 200916 yr by sparky93

Any idea's what is making a odd noise. it sounds like someone tapping a small drum. 1 tap. Happens hot or cold. Turn off engine and 3 seconds later a thud.

On Turbo diesel models that is an anti-shudder flap that cuts off the air supply on shut-down - for three seconds. My guess is that the flap valve is making this noise when it returns to normal position.

It is mounted on the drivers side of the car in the air supply pipe you can see at the top going to the inlet manifold. You will able to see or feel the vacuum operated lever which moves the flap, or put you hand on the pipe and see if the click can be felt when someone turns off the engine for you.

Why yours is noisy I don't know, perhaps just wear. I would expect the mechanism to move slowly as the vacuum is released.

Hope this helps you find it.

Edited 18 December, 200916 yr by pikpilot

Thanks for that, I will take a look in the light. Wonder why its sudden/ and noise making. the car has done only 23k, 03 plate.

I have just had a look for this air valve part and I watched it spring hard close making the noise.

On the air tube(trunk) there is a silver vacum type device with a small tube coming out of it. This pipe goes onto the bulkhead and across to a part marked VAC and the pipe does suck a little. I pulled the pipe off the silver part and ran the car and didnt notice any running change. Turned off engine and the air valve, after 3 seconds, shut smoothly and quietly.

Edited 21 December, 200916 yr by sparky93

I have just had a look for this air valve part and I watched it spring hard close making the noise.

On the air tube(trunk) there is a silver vacum type device with a small tube coming out of it. This pipe goes onto the bulkhead and across to a part marked VAC and the pipe does suck a little. I pulled the pipe off the silver part and ran the car and didnt notice any running change. Turned off engine and the air valve, after 3 seconds, shut smoothly and quietly.

My guess is that you had a small air leak where the vac pipe joins the actuator and by refitting it, the leak has now gone so making the flap valve move smoothly again. Worth checking the rubber pipe for cracking - if so replace it when you can.

My guess is that you had a small air leak where the vac pipe joins the actuator and by refitting it, the leak has now gone so making the flap valve move smoothly again. Worth checking the rubber pipe for cracking - if so replace it when you can.

I missed a bit of text off. When I put that tube back ok, the hard clunk of the valve returned. I need a pic really of that area :-)

I missed a bit of text off. When I put that tube back ok, the hard clunk of the valve returned. I need a pic really of that area :-)

Hope the poor picture worked, The left circle is where this valve flap is. The middle circle is the silver thing I refered to and its pipe i pulled off. doing this made the valve smooth in operation. Putting it back on the hard changeover returned. The right blue circle is where the pipe ends, in the VAC part.

Hope the poor picture worked, The left circle is where this valve flap is. The middle circle is the silver thing I refered to and its pipe i pulled off. doing this made the valve smooth in operation. Putting it back on the hard changeover returned. The right blue circle is where the pipe ends, in the VAC part.

pic attached but not showing, here it is as link

http://nellwells.myby.co.uk/valve.bmp

<http://nellwells.myby.co.uk/valve.bmp>