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.
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.