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.
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HOMESERVICE MANUALSFORD1999MUSTANG GT, 2D CONVERTIBLE, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)EXTERNAL PAGESDIFFERENT CARSECTION 24 (ENGINE CONTROLS - THEORY & OPERATION - GASOLINE & NGV)COMPUTERIZED ENGINE CONTROLSOUTPUT DEVICESCOIL ON PLUG
1999 Ford Mustang GT, 2D Convertible, Standard
Coil On Plug
1999 Ford Mustang GT, 2D Convertible, StandardSECTION Coil On Plug
WARNING: This page does not describe the selected car, but rather 32 other vehicles, including the 2002 Mercury Sable, 2002 Mercury Mountaineer, 2002 Mercury Grand Marquis, 2002 Mercury Cougar, and 2002 Lincoln Town Car. However, it is still accessible from the selected car via links, so may be relevant.
Coil On Plug (COP) ignition operates similar to a standard coil pack ignition except each spark plug has one coil per spark plug. See Fig 1. COP has 3 different modes of operation:
- Engine Cranking
During engine cranking, PCM will fire 2 spark plugs simultaneously. One spark plug will fire on compression stroke and the other spark plug fires on exhaust stroke. Both spark plugs will fire until camshaft position is identified by a successful camshaft sensor signal. - Engine Running
Once camshaft position is identified and engine is running, only spark plug with cylinder under compression will be fired. - CMP Failure Mode Effects Management (CMP FMEM)
During CMP FMEM, COP ignition operates similar to engine cranking mode. This allows engine to operate without requiring PCM to know if cylinder is on compression or exhaust stroke.
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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.