BMW M54 PCV Membrane: Typical Symptoms of a Failing Crankcase Ventilation System
On an M54, CCV issues often begin as a small annoyance and then become obvious. First, it is an idle quality. Then it is a hiss or whistle from the...
Audi 2.0L: How to Tell if the Problem Is the PCV Membrane and Not the Breather Hoses
Audi 2.0L crankcase ventilation issues often produce very similar symptoms. Audi 2.0 PCV rough idle. A whistle or hiss. Vacuum leak vibes. Maybe a check engine light. At that point,...
Audi 2.0 FSI Rough Idle: Is the Valve Cover or the PCV System Causing It?
Audi 2.0 FSI rough idle PCV is one of those problems that makes you stare at the tachometer and go “wait, is it supposed to do that?” Sometimes the idle...
Audi 1.5 TSI: When to Replace the PCV Membrane and the First Signs of Failure
A tiny diaphragm can cause a lot of noise and not-so-tiny problems. On the Audi 1.5 TSI, the PCV membrane helps control crankcase pressure, keeps idle stable, and manages oil...
BMW B58 PCV Repair Kit: When to Repair the Valve Cover Instead of Replacing the Entire Assembly
For B58 owners, the “repair or replace” question comes up fast after the whistle and idle issues start. The good news is that many issues are isolated to the diaphragm...
BMW M3/M4 S55: Whistling Noise, Vacuum Leaks, and PCV System Problems
You know that moment on the S55: it idles, everything feels fine… and then you hear it. A BMW S55 whistling noise at idle. Or a squeal. Sometimes it sounds...
BMW B58 Whistling at Idle: Is the Valve Cover Diaphragm to Blame?
A whistle. Sometimes it is a soft hiss; sometimes it turns into a more pronounced “whooo” sound typical of BMW B58 whistling at idle. Not scary like a knock, but...
BMW B58 Valve Cover Diaphragm: Common Failure Symptoms
If your B58 has started to whistle under the valve cover, idle roughly, or drink oil faster than it used to, don’t be scared about the turbo (as most drivers...
Common PCV Failures on BMW N52, N52N, N52K, and N51: Symptoms and Repair Options
Many BMW owners notice the same small but annoying problems. Unfortunately, these are the first BMW N52 PCV symptoms, and they often begin almost silently. The sooner you address these...
Common PCV Failures on Audi 1.4L and 1.6L: Why a Whistling Noise Starts Under the Cover
A thin whistle from under the cover is a common problem with Audi 1.4L and 1.6L engines. No driver can ignore it for so long: it’s annoying, intermittent, and a...