Tapping Sound at idle

[jpbecker]

Hey guys, I have an annoying tap tap tapping sound at idle on my car. I have a 2008 987 2.7 with only 13,000 miles. It sounds exactly like this related YOUTUBE post someone else listed:

http://www.youtube.com/watch?v=rL9_PsYkvow&feature=related

Any ideas?

 

[gdavison]

run it a while until warm .. rev it when warm and take it for a drive !!!!!!!!!!!!!!! .. tapping noise will go []

 

[jpbecker]

[] I know but the sound was at the end of the day when opening the garage door so totally warm!!

 

[Richard_Hamilton]

Might be worth checking tha spark plugs are tight. Not uncommon for one to come loose, but they tend to make a noise that sounds more like a chirp than a tap.

 

[jpbecker]

Thanks Richard, my sounds exactly like the youtube link

 

[CLIFFWILKINS]

Could be the dual mass, heard lots making this noise
Only my opinion

 

[jpbecker]

If dual mass what does that mean?

 

[jpbecker]

looks like I'll have to take it in to get checked out. I figured it may have been common or normal but I guess not!

 

[Buddy]

Dual Mass Flywheel.

As with a normal flywheel a rotating mass to smooth out the rotation of the shaft, to a large extent smooths out vibrations/pulsations in an engine.

In the case of the dual mass flywheel there are to put it basically, two related masses built into the flywheel which is not a single solid mass although in most running conditions acts as one, these are related to each other in part by damping springs built into the assembly so while the whole assembly effectively works as the rotating mass or flywheel the damped element further damps the pulsations especially at low engine speeds.

Problems come about in the event of any of the damping components breaking or becoming loose.

I hope this helps