I did have to lol the first time I heard it happen in person!
Neil.
It is quite an amusing noise!
As a general bit of info for the thread, I changed my spark plugs on saturday, which involved removing the upper inlet manifold. It was fiddly, but not as bad as people make out on other forums! Getting to the rear two nuts (one holds a wiring loom up, the one below that holds the manifold on at the back - you only need to slacken off this nut) was fiddly but fine with a set of ratchet spanners (with a piece of string tied to them in case I dropped them down behind the engine). Then you just remove the six bolts on top near the inlet ports, then two bolts holding on the bracket for a purge valve at the back to the right of the manifold, then there's another bolt attaching a bracket below and to the rear of the throttle body. Disconnect the rear breather hose, brake vacuum hose, and other vacuum/breather hoses that may not flex so well, and gently lift the manifold up. I suspended it at about 45 degrees by resting it on a large ring spanner!
The old plugs were very worn, and it has made a bit of a difference to how the engine feels, particularly at low revs and idle speeds.
If you need to do yours, don't be scared
![Wink ;) ;)](/styles/default/xenforo/vbSmilies/Normal/wink.gif)