Muffled Thud

[NagaBurns]

Hi Guys
I've got a MK1 LEON 1.9 TDI 110 bhp (55k).
I'm new to diesels and have only had the car a little over a month and I am concerned that two or three seconds after turning the engine off there is a single muffled thud. It's done it for a few days now but there seems to be no other symptoms indicating any obvious problem, in that it drives fine and starts perfectly every time.
I have used the search feature on the forum but have drawn a blank on finding an answer but I know a bit about sound deadening now;-)

Thanks in advance
Lee

 

[NI3K]

you dont have a sub do you?

 

[NagaBurns]

Hi NI3K
Thanks for your reply, but no I don't have a sub. I have managed to get out of the car quick enough to hear it outside so I know it's coming from the engine.
Another way of describing the noise would be to say that it sounds like a door being closed in a different room or in your neighbours house. I had thought it might be a valve sticking and releasing pressure but I don't know enough about this kind of stuff to even hazard a guess really.

All the best
Lee

 

[MJ]

Sounds like the anti shudder valve on the inlet manifold. Thats the only thing active after the engine is switched off.

 

[NagaBurns]

Thanks for that MJ, I'll have a poke about tomorrow and check it out. Do you think it'll just need cleaning out and some lube?

All the best
Lee