DISTRIBUTORLESS Ignition System
The Viper uses a distributorless electronic ignition system. Since the system does not use a distributor, ignition timing is not adjustable. The system uses two epoxy filled coil packs mounted on the rear of the cylinder heads. See illustrations Fig 1 and Fig 2 .
The coil pack on the left side of the engine contains three separate coils and fires cylinders 1, 2, 3, 6, 8, and 9. The coil pack on the right side of the engine contains two individual coils and fires cylinders 4, 5, 7, and 10. When one of the coils discharges, it fires two cylinders at the same time (one cylinder on its compression stroke, the other on its exhaust stroke). At the request of the Powertrain Control Module (PCM), the Ignition Control Module (ICM) energizes the individual coils in each coil pack. The ICM energizes each coil by providing a ground path. The PCM and ICM determine cylinder identification from the crankshaft position sensor and camshaft position sensor inputs. The PCM operates the fuel injection system. It operates the ignition system through the ICM. The firing order of the 8.0L V10 engine is 1-10-9-4-3-6-5-8-7-2. See Fig 3 .