Ignition · 4 / 6 / 8 cyl

• K4Ignition 1
• K3Ignition 2
• K2Ignition 3
• K1Ignition 4
• J3GP Out 5
• J4GP Out 6

4-cylinder

Smart coils on K4–K1 (Ignition 1–4). Wasted spark with two coils, or sequential COP with four coils plus a cam on F4. Coil +12 V from main-relay 87. Coil power ground to the head, not analog ground.

6-cylinder — wasted spark

Three logic coils on K4, K3, K2 (Ignition 1–3). Two cylinders per coil. Ignition 4 (K1) is taken by the 6-cyl 3-channel injector driver — do not also put a coil on it.

8-cylinder — wasted spark

Four logic outputs on K4–K1, wasted spark (two cylinders per coil). Pair cylinders 360° apart. Example 1UZ-FE order 1-8-4-3-6-5-7-2 pairs as 1&6, 8&5, 4&7, 3&2 — assign whatever firing order the engine actually has. GPO 5 / 6 are then free for the two-channel injector driver.

Lock timing to a fixed 10° and confirm with a light on cylinder 1 before you add load. If the light is 180° out, add 360° to the offset or swap wasted-spark pairs — do not guess with fuel in the hole.