B7 RS4 Jumpy Idle

[E36graduate]

At Idle, RPM's go from 800 to 1200 and then back to 800, consistently. Fuel adaptive trim were:

Bank 1
idle/long term
-2.5% / 0.0%

Bank 2
-1.5% / -4.7%

Some misfires on cold start. Also, on cold start the idle is much higher than normal until it comes down.

If you pull out the oil dip stick the idle smooths out. If you take off oil filler, the car dies.

After I pulled out the oil dip stick for a few minutes, I put it back in and the car idle was still smooth. The car ran well, but felt throttle was a bit sensitive.

I'm thinking vaccum leak, something to do with the oil separator, any ideas?

[MikeFish]

MAF?

[E36graduate]

I logged the MAF and did a 1st gear pull and it seemed okay....?

[Frostie]

Mine was up to similar antics.... replaced the PCV valve and is all good now.