BrittEC_

2009 Audi A4 Quattro 2.0T.

My car suddenly shakes, sputters, check engine light is on and sometimes when in park it blinks, also I am going through gas pretty quick.. I took it to Autozone to have codes read and these are what was read:

P0300 Random misfire detected.
P2015 Intake manifold Runner Position Sensor/ Switch Circuit Range/ Performance Bank 1.
P0304 Cylinder 4 Misfire Detected
P0303 Cylinder 3 Misfire Detected
P0302 Cylinder 2 Misfire Detected
P0506 Idle Air Control System RPM Lower than Expected
P2279 Intake Air system leak.
P0301 Cylinder 1 Misfire detected

Anyone have any ideas on what it could be?


I just got it from my uncle and am at a loss of what it could be. It was in working order until i started driving it on the highway, then that is when the problems started.

SMac770

First thing I'd look at is the PCV diaphragm. Had to replace that from time to time.
Though you didn't mention it sounds like a freight train whistle. When the PCV diaphragm goes, everyone within a hundred feet will usually know.
When you pull the oil tube plug (where the dipstick would normally have been), does it smooth out?

Intake manifold code though would not be related. Might have the broken intake manifold.
That's apparently a new video, but at 1:48 he's showing the old video and the part that pops out when the manifold breaks in one of its many ways (this is how mine broke). That part is the back end, towards the firewall. See if slides in and out of the manifold.

BrittEC_

If I take it out and it smooths does that mean its the PCV Diaphragm or the Intake Manifold?

SMac770

Well, if you have both issues, .... I never had both issues at the same time. Both relate to an air imbalance, and the opening of the oil tube just helps confirm that. But it alone doesn't pin point where your air leak is.
Another thing you can check is if you look at the PCV on top of the engine, on the backside of the round top is a pin hole. Do you feel a strong air flow coming out of that? (that's where the whistle would be) If so, that means there's a tear in the diaphragm.
You can freely push on that intake manifold arm to feel it do its movement. Does the other end of the arm (what you see in the youtube vid cover) seem securely in place in the manifold?
The P2015 would point more to the manifold, but I've had that code pop up on long travels (no evident operational issues) and a reset and it wouldn't come back. Eventually the arm broke (was popping out of the manifold under pressure) and I replaced it. When it really broke, the engine operation was a mess.