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...
Audi 1.4T, 1.8T, and 2.0T: Symptoms of a Bad Valve Cover Membrane
There are three key signs that something is wrong: a whistle, an unstable idle, and an oil film. Unfortunately, these are the most common Audi valve cover membrane symptoms. This...
Audi 2.0 TSI Lean Mixture Codes: How to Check if the PCV Membrane Is the Problem
Lean codes can be frustrating because the car feels like it’s “not getting fuel.” But the real issue may be extra air through the Audi 2.0 TSI lean mixture PCV...
Audi 2.0 TFSI Burning Oil: When the Oil Separator Is the Problem, Not the Turbo
Blue smoke and a low oil level make drivers blame the turbo right away. Fair choice. But for the Audi 2.0 TFSI turbo, oil consumption can also come from crankcase...
Why the Audi 1.8 TFSI Develops a PCV Vacuum Leak and How to Spot the Symptoms
Noticed that your Audi runs lean, stumbles at idle, or triggers the check engine light that looks “air leak-ish”? This usually indicates typical Audi PCV membrane failure symptoms. This is...