General notes

Notice! Observe exact position of the spark plug in direct ignition systems. 

In contrast to naturally aspirated engines, a pronounced charge movement is generated in spray-guided direct injection engines. The spark plug must be geometrically situated directly in the respective injected fuel spray. In spray-guided direct injection diesel engines the exact seating is ensured by a straight-cut thread on the spark plug and in the cylinder head. A precise tightening torque of 23 Nm ± 3 Nm must be observed in the process. As the spark plug electrodes are positioned particularly deep inside the combustion chamber. lean mixture compositions can also be ignited. This is important in the cold-start phase and in the catalytic converter warm-up phase. Multiple sparks are also discharged during this phase when, in contrast to previous engine management systems, all ignition-related diagnostic functions remain active.

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