How to count Vauxhall cylinder sequence

How to count the cylinder sequence of a Vauxhall movan B combi.

A workshop faced a tough ask when the injectors of a 2017 model needed to be serviced – but the cylinder numbering was not visible on the vehicle’s documents – so how did the technician overcome this?

Correct cylinder numbering is essential for accurate fault diagnosis. In modern engines with common rail direct injection, each injector is individually programmed to its corresponding cylinder. Incorrect assignment can cause misfiring, rough running or power loss.

Without the correct information, the technician would likely have disconnected the injectors or dismantled them – a risk that could have exacerbated the issue to the detriment of the motorist, according to ALLDATA Europe.

To quickly return the vehicle to the road, the technician contacted the ALLDATA Info Centre. An expert guided them to the correct information in ALLDATA Repair, a portal that grants independent workshop and bodyshop professionals access to genuine repair and maintenance instructions.

A targeted search for the relevant VM schematics for the engine control and glow plugs showed that one glow plug is equipped with a combustion chamber pressure sensor – a clear indication of cylinder one. With this crucial information, the technician was able to determine the correct cylinder sequence.