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1. Disconnect the battery

2. Label all spark plug wires so that they can be reattached in the exact positions on the Coil packs.

3. Unhook the spark plug wires from the coil packs.

4. There are usually 2 bolts holding each coil pack to the Ignition Control Module. undo all bolts and the coil packs should come off.

5. The wafer the coil packs are attached to is the Ignition Control Module. Where the wiring harness attaches to the ICM, there is 1 or 2 screws too detach the wires. Undo these screws.

6. On the new ICM place the new gasket onto the ICM, inside the area where the wires attach, be careful not too bend any of the wire prongs inside. I find a small flathead screwdriver and minimal pressure works well.

7. Place the gaskets onto the prongs where the coil packs attach. Again do not bend the prongs.

8. Attach new ICM back to the wiring harness.

9. Seat the CoilPacks onto the ICM and seat the coil packs onto the ICM using the bolts to hold them on. Align the bolts with the holes to mount entire assembly back to the motor. You can attach ICM first to motor then attach the coil packs. The bolts that hold the coil packs to the ICM also hold the ICM to the motor. Tighten all bolts.

10. Reattach the spark plug wires to the coil packs IN THE EXACT SPOT they were before removal. Getting the order wrong can really kill your engine.

11. Reconnect your negative battery cable and everything should be okay.

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Q: How do I Replace a engine control module on a 1991 olds 98?
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