LS Coil Instructions

The mechanical installation of the bracket and coils is fairly straight forward. Install the coils onto the bracket with the supplied hardware (if you ordered the complete kit). De-torque all your valve cover bolts before removing the ones where the bracket goes. Put on the bracket and then follow the torque specs and order in the service manual.

Wiring instructions are specific to each year, so we put together an overall guide. Download that here

The spark plug wires are 3 different lengths. A shorter one, a middle one, and two longer ones. We designed them to be installed long, long, medium, short from front to back, however, you can install these however you want to be the most aesthetically pleasing. On 1990-2000 engines the plug wires should fit in without any fuss. Once the wire clicks onto the spark plug, you may need to press the top of the boot a bit to get it to seal nicely in place. 2001-2005 cars have slightly smaller plug boot holes, and also two of the spark plug holes are raised slightly. The plug wires should fit the lower holes with a slight gap. For the raised holes, a little trimming is required to slim down the boot.

With the wiring done and the bracket, coils, and plug wires installed, it’s time to set up your tune. The below is for Megasquirt 3, and other MS version and stand along ECUs should be similar.

Start by setting up your coil settings

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Then set up your dwell table and battery correction.

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Now it’s time to drive your car! You will likely need to slightly tune much if not all of your fuel table. LS coils pack a meatier punch and will give you more complete combustion.

Sequential Add-On

The FlowForce LS coil harness comes wired for wasted spark for plug and play ease, and is also upgradeable for sequential ignition. The switch to sequential is fully reversible, and the upgrade kit is available on this site.

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The middle connectors are for cylinders 2 and 3 and the outer connectors are for cylinders 1 and 4 in batch configuration. When switching to sequential, choose one 1/4 connector and one 2/3 connector to re-pin to wires that run straight to your ECU. You can choose which connectors you re-pin based on the layout of your harness in your car. On each you need to remove the middle wire and replace it with the new sequential wire. To make the upgrade fully reversible, insulate and tape back the old middle wire.

Start by removing the wire guard

Start by removing the wire guard

Then pull with firm careful pressure to remove the white cover

Then pull with firm careful pressure to remove the white cover

Use a small flat screwdriver or pick to pull up on the retainer clip, and pull out the middle wire.

Use a small flat screwdriver or pick to pull up on the retainer clip, and pull out the middle wire.

Once the wiring is complete at the harness, run the two new sequential wires back to your ecu, and splice to your spare ignition signal wires. Make the appropriate adjustments in your tuning software to indicate which ignition output controls which coil.