My 996 Porsche 911 Targa has been suffering from a terrible misfire and rough running from its M96 flat-six engine. After changing the coil packs to no avail, here's the story of how we fixed the misfire!
This guide to diagnosing M96 engine misfires will be useful to anyone with a second-generation Porsche 996 or 986 Boxster. It covers how to change the air oil separator (AOS) and signs of AOS failure, as well as a detailed look at how Variocam Plus works.
If you're worried your 991 or Boxster may be suffering from bore-scoring, d-chunking, IMS failure or other issues, watch this video first!
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▬ Contents of this video ▬▬▬▬▬▬▬▬▬▬
0:00 - Intro
00:26 - The Story so Far
02:27 - Misfire Diagnosis
03:04 - Air Oil Separator Replacement
06:16 - Engine Knocking
07:01 - Professional Diagnosis
07:37 - Faulty Variocam System
08:22 - Variocam Plus Explained
11:35 - Variocam Fix
12:38 - Misfire Fixed!
14:24 - Diagnostic Tips
13:15 - Engine fire up
14:13 - Test Drive
17:32 - Outro
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▬ Links and Credits ▬▬▬▬▬▬▬▬▬▬
HUGE thanks to Mike at Zentrum, Calverton - https://www.zentrum.co.uk/
AOS replacement guide at Pelican Parts - https://www.pelicanparts.com/techarticles/Porsche-996-997-Carrera/09-ENGINE-Air_Oil_Separator/09-ENGINE-Air_Oil_Separator.htm
Variocam Operation Diagram - Copyright Porsche, used under "fair use for purposes of instruction"