Ignition System: Description and Operation

V8 DFI Engines

Ignition Coils







The Cayenne has static high-voltage ignition distribution with individual ignition coils attached directly to the spark plugs. The newly enhanced ignition coils in V8 DFI engines work according to the same principle as previous V8 ignition coils.

This system offers the following advantages:
- High level of ignition safety.
- Minimum electromagnetic interference with other electronic components.
- No requirement for ignition cables and distributor ignition.

The DME control unit activates the individual ignition coils individually in the firing order 1-3-7-2-6-5-4-8 for each cylinder. Safer ignition processes and therefore optimized power, together with minimized emissions and fuel consumption are obtained as a result of the measures and advantages described. All parts in this enhanced component are installed as a complete unit in a special rod ignition module housing. This is connected electrically and mechanically to the spark plug in the spark plug recess via the short high-voltage plug. The component is also secured mechanically using bolts. The ignition coil is sealed at the four-pin plug and in the spark plug recess to protect it from spray water.


Cayenne Turbo Spark Plugs

The V8 turbo engine has air gap spark plugs with one double-platinum ground electrode, which must be changed every 24,000 miles (40,000 km) or after 4 years according to the Technical Data.

NOTE: Spark plug replacement intervals have changed for M.Y. 2008 when compared to the 2003-2006 Cayenne models.