Slight top end rattle?

[Jcerb]

Evening all, my 2.5 has been sat for about 6 weeks in the garage and started up for the first time tonight and noticed under very light throttle at idle; right next to the throttle there is a rattling? Once the revs pick up you can't really hear it. But it's like a quick mini wood pecker! Is it oil not getting around to the top end? I never noticed it before...Cars on 28k and just had remap (about 3 months ago). Many Thanks

[Jcerb]

Oh dear, well I hope it's not that! You can only hear it when you're down close with your ear, it doesn't do it a idle at all. Never noticed it after the mapping just after being sat for a while... It was only at Jetstream a couple of months back just before it was mapped!

[Jcerb]

That's right, and strangly after letting it cool down for a couple of hours it had stopped for the first 30 odd seconds, then it started up again?? It's like a little rattle snake it probably a better way to describe it ha ha. But it is coming straight from the throttle body, no where near the rocker covers. I checked the butterfly and no play there also checked the TPS all fine mmmmmmmm

[Jcerb]

I will have a look, I didn't notice any nuts around there only the tensioner spring. Do you think a stethoscope would narrow this down? I hope I can get a garage to just have a listen to get an opinion.

[Jcerb]

Thanks guys for all your help so far, I have a mechanic looking at it later today. Fuel filter is new and pump should be fine as not long had wiring mod done by Jetstream. The sound is very localised to throttle body, nowhere else!

[Jcerb]

It turned out to be the electronic boost control valve!!! It is perfectly fine. Thanks very much to all of you for your help here.