tappety

hello my injectors seem to be abit tappety? why is this? what should i do? thanks

:confused: I have notice when I come to a stop in my daily commute, that I have a tappety noise developing, it seems to be coming from the engine bay around the region of the altenator, any ideas what this may be?

When I start my Passat the first time each day, it makes a tappety noise for a few seconds until the oil pressure is up, then it goes quiet. If I stop and start up again later in the day, it's fine - only makes the noise when it's been stopped for a long time (ie overnight). I know it's...