Commodore Hall Effect Timing Sensor - DFI
The ignition system used in Commodores up to the Alloytec is different to most vehicle ignition systems. The ignition system used is a distributorless Direct Fire Ignition System.
The differences include;
- No Distributor is used to supply spark.
- 2 sparks occur during each cylinders cycle (Waste Spark).
- The ignition system is part of the Engine Management System and is commonly known as Electronic Spark Timing.
- In this system 3 coils are used - controlled by the ECU - No distributor is used
The Ignition timing is non adjustable, controlled by the ECU (Electronic Control Unit). The Ignition system incorporates a Delco Direct Fire Ignition System (DFI) With waste spark, 1 durng compression and 1 during exhaust stroke.
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| Harmonic Balancer - Crankshaft Pulley |
| This image shows the 18 evenly spaced windows and the 3 unevenly spaced windows. |
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| Crankshaft Position Sensor or Crank Angle Sensor |
| This is a Dual Hall Effect Sensor with a common magnet between the two Hall Effect Sensors. |
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| Sensor Location |
| The sensor is located to the left of the timing chain cover and is just behind the harmonc balancer. |
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| DFI Module |
| Three twin tower ignition coils are used and combined into a single coil pack unit. The coils are mounted on top of the DFI Module on the left side cylinder head. |
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For a list of child restraint fitters and to view the new laws