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: Description
The Delco-Remy High Energy Ignition System (HEI) consists of a distributor with an integral electronic module, a battery, an ignition coil, an ignition switch, spark plugs, and primary and secondary wiring.
The HEI distributor housing encloses the following components: Vacuum and centrifugal advance mechanisms, magnetic pick-up coil, pole piece (with internal teeth), trigger wheel (with external teeth), an electronic module (with built-in radio noise suppression capacitor), rotor and distributor shaft. See Fig 1.
All HEI systems use 8 mm spark plug wiring and wide spark plug gaps. An electrical connector on the side of the distributor housing connects the HEI system with the vehicle's ignition and battery wiring.
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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.
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