Ritchie

I have a 2005 A4 quattro with the 1.8L. It just turned 76k on the odometer. Yesterday I drove to work no issues parked and the idle sat high then the CEL came on solid. I left work and when I started the car the idle was still high and CEL was still on. Stopped to pick my kid up and plugged in obd2 reader. It came up with random misfire, misfire cylinders 1-4, and high idle speed. I cleared the codes and the idle dropped became extremely rough with very noticeable misses. I drove home a couple of miles and at higher rpms it smoothed out. I got on it once and it spooled up but not as peppy as before. When I got home I could smell oil. Popped the hood and the dipstick had been blown out and the engine bay was covered in vast amounts of oil. Not sure where to go from here. Could the pcv valve do all of this? A coil pack should not create crank case pressure. I'm not rich enough at this point to take it to Audi or to start just throwing money at it. Any input is appreciated. I did flush out and clean pcv valve when the dealer said they'd have to order one and there was no change and all the same codes.

Prospeeder

yea sounds like the crank case vent valve stuck open. Its a giant air leak and vacuum leak. And Its a boost leak, and its filling the crankcase with pressure and will start making seals leak. being lean will cause the misfires and high idle.

joelj

Had the same problems a while back which ended up being the breather hose had just started crumbling around the oil filter housing and allowing air in/out. It could be the valve, but it could also just be a leak like mine. Also I wouldn't drive it like that for too long as it tends to spit out oil from everywhere with all the pressure build up