Question will be kinda vague, but I have some rattling at low rmp when car is first started. Once idle kicks down (after one minute or so, when 'warmed up', it goes away. It sounds like it's coming from engine (2003 A4 1.8) at "back", near firewall, perhaps a hose is loose and kicking out air, or maybe it's even mechanical. The engine makes the noise no matter if the climate system is on or off.

Again, kinda vague, but trying to learn to repair this myself and not finding anything in manuals I have. Any input would be appreciated! Thanks, Kevin.

 

probably lifter/tappet rattle which is quite normal as long as it goes away in seconds, do an oil and filter change but it happens to new cars when stood over night so nothing to worry about

 

Thanks, Dave. I have some Valvoline oil in there right now, synthetic. I usually use Mobil 1 and didnt last time, store was out. Vibrations seem louder with this other oil, but since bought this (2003) car in May, it seems to be getting louder. I will definitely check out/change oil back to what I was using, see if oil up into engine quicker helps reduce rattlign. Thanks.

 

can you give us more info?

Have you listened with the hood up to pinpoint the noise?

Sounds like lifter tick, but not sure. Almost sounds like you have a rattle at certain rpm that goes away when the rpm changes.