OEM data Archives - Professional Motor Mechanic https://pmmonline.co.uk/tag/oem-data/ The website for motor industry servicing and repair professionals Thu, 07 May 2026 10:55:28 +0000 en-GB hourly 1 https://pmmonline.co.uk/wp-content/uploads/2024/06/PMM-Site-Icon-24-36x36.jpg OEM data Archives - Professional Motor Mechanic https://pmmonline.co.uk/tag/oem-data/ 32 32 Why are Porsche 911 Carrera’s misfiring https://pmmonline.co.uk/technical/why-are-porsche-911-carreras-misfiring/ Fri, 08 May 2026 18:04:01 +0000 https://pmmonline.co.uk/?p=44949 Why are Porsche 911 Carrera's misfiring

Why would a Porsche 911 Carrera 4S start misfiring on cylinder four following a routine spark plug replacement? ALLDATA and Porsche’s OEM repair data can provide an answer.  Problem  Following a standard spark plug change, a Porsche 911 Carrera 4S (Type 992, 3.0L) returned to the workshop after the driver noticed poor engine performance. The ...

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