Nocking on idle - definately not clutch !!

[tommy_a]

I think I already know the answer to this but thought I'd ask anyway!

I got in my car (Leon Cupra) yesterday morning and when I started her up there was a rather loud knocking sound coming from under the dash whilst the car was idling. Once I was on the move it went away! I stopped at set of traffic lights and the noise came back. I blipped the throttle and the noise went away. As soon as it settled back to idle it came back!

I've also noticed that if I'm driving along and I put the clutch in the noise appears but is quiet faint! Am I right in thinking that this could be the clutch? Anyone else had a similar experience?

[derek]

Possibly be clutch release or thrust bearing.

I would take it and get it checked out.

[tommy_a]

Cheers for that mate!

I've been trying to find the source of the noise today and I'm thinking it might not actually be the clutch! When I depress the clutch the noise is still there! It seems to be coming from under the center console under the gearstick area! This is leading me to believe it's a knocking/rubbing noise! I've looked but can't find anything! I'm going to jack it up and have a poper look around tomorrow. If I can't find anything it's going back into seat!

[tommy_a]

right, well in the last couple of hours it seems to have gotten slightly louder !!

on idle there is a loud tapping noise coming from under the dash area (under the car exhaust tunnel/back of engine area). it doesnt sound like a metal on metal noise as its not a tinny high pitch noise more of a dull plastic on plastic noise !!

anyone any ideas or suggestions ??

[tommy_a]

well it went into Seat today and they found out that a fuel pipe running under the car had come loose !! just glad its sorted now !! 

[mattchaps]

well it went into Seat today and they found out that a fuel pipe running under the car had come loose !! just glad its sorted now !! 

Happy days, the list of possibilities could have been endless! We like a good ending

[snapey]

I've got a similar issue to the one you've described, thank god its something simple. Does anyone know where the fuel line runs? Am I right in thinking its along the offside?

Luke

[JackP]

iv got exactly the same problem, when idle my car is only running on 3 cylinders (golf tdi), but when any revs are applied it goes back to normal. its a loud and fast tapping noise. an AA guy told me it could be sticking valves so i flushed the oil out and changed it but the noise came back after about 5 minutes of driving. anybody have any ideas what it could be?