LS2 Ignition Coil
ABOUT
Description
Haltech does not currently sell this part.
The LS2 ignition coil is a high output inductive coil with an internal igniter module. These were found on most General Motors LS2 and LS3 Gen 4 engines and are commonly used in the aftermarket.
it requires a unique spark plug lead connection that incorporate a ferrule. Without the correct spark plug lead connection it is possible for the spark to arc to the coil mount body section of the coil near the spark discharge post.
LS2 Truck Coil Variant
These are identified by a large heat sink. Wiring is the same as for normal LS2 coils.
SETTINGS
Configuration
| Haltech Elite Series Setting | Value |
Ignition Mode | Installation Dependent |
Ignition Edge | Falling |
Ignition Dwell Mode | Constant Charge |
DWELL
Charging LS2 coils at over ~5ms can lead to them auto-discharging which results in random ignition timing. It appears to be an issue with "break" time, the time between firing events. With high dwell time they will run fine at low rpm, but as rpm is increased issues can be seen. Care should be taken to not overcharge these coils especially at higher RPM.
Suggested Dwell Time for LS2 Coils
WIRING
Pin Letters are on the Connector Shell
| Pin | Connection |
| A | Ground (Cylinder Head) |
| B | Ground (ECU Signal Ground) |
| C | Ignition Output |
| D | 12V+ |
It is advised to Ground both pins A and B to the Cylinder Head to avoid grounding issues causing damage to the coils.
NOTES
12V Power Supply
The LS2 coil can draw up to 10A. If high rpm and high power is being used, together with conventional 30A Relays to provide power, it may be necessary to have a separate fuse and relay for every pair of coils. This is rare but it is possible.
If the wiring is also not cable of supplying the current required it can also limit the spark output.
Grounding
The number of grounds (2x) on this coil often cause confusion. If in doubt, all grounds can be joined together and run the to cylinder head. This can eliminate issues if there is a poor engine ground strap that then pushes high current through the coil. It can also prevent a coil from firing if the engine grounding is not sufficient, and this happens as the ground lifts on the ECU signal preventing triggering. The fix is of course to improve the engine grounding.
Officially:
Ground Pin A should go to the Cylinder Head and is the return path for the spark
Ground Pin B should go to the ECU Signal Ground and is used as a reference for the ECU Ignition Output.
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