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.
Coil-Near-Plug Ignition
The Coil-Near-Plug (CNP) ignition system, used on Camaro, Firebird and Corvette, eliminates the need for a mechanical distributor. The CNP ignition system consists of 8 ignition coil/module assemblies, 8 separate Ignition Control (IC) circuits, Camshaft Position (CMP) sensor, 1X camshaft reluctor wheel, Crankshaft Position (CKP) sensor, 24X crankshaft reluctor wheel and a Powertrain Control Module (PCM).
Each individual coil/module assembly is mounted above its respective cylinder on the rocker covers, and are attached to spark plugs using short secondary wires. Each coil/module assembly is attached to the PCM with a separate IC circuit and are fired sequentially. Ignition timing decisions are made by PCM based on input from the crankshaft reference signal and various other sensors. PCM triggers and controls timing of each coil/module assembly individually.
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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.