Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Ignition System - TFI-IV: Operation
The TFI-IV distributor uses a Hall Effect switch mechanism to switch primary voltage and send a Profile Ignition Pickup (PIP) to the Electronic Control Assembly (ECA) and TFI module on 3.8L engines. On all models, the ECA uses PIP input signal to produce an output signal called SPOUT that is sent to the TFI ignition module to be used to trigger discharge of coil secondary voltage.
Secondary voltage is distributed through a conventional cap, rotor and spark plug wires.
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.