dipping revs

[Corne]

Hi

My Audi's revs dips when I take off the oil filler cap, is that normal or not, she doesn't stall or anything, the revs just dips a bit and stay there. Is that ok or not?
Corne

 

[scotty33]

Yes that is normal. The crankcase breather system is connected into the intake, when you open the oil filler, you are letting in unmetered air through the breather system.

 

[5potnoodle]

You don't say what engine you have there...

My 5pot 1B engine stalls when I do that (and my NF before that), it's a good check to see if you have any vacuum leaks... or so I've been told anyway. If it doesn't stall there may be a leak elsewhere.

 

[Corne]

You don't say what engine you have there...

My 5pot 1B engine stalls when I do that (and my NF before that), it's a good check to see if you have any vacuum leaks... or so I've been told anyway. If it doesn't stall there may be a leak elsewhere.

Hi, sorry for takin so long to write back, I have an AAH engine 2.8 V6, Thanks for the help.
Corne