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.
1986 Jeep Comanche Base, 2.8 W, 4WD, StandardFACTORY OEM SERVICE PROCEDURE
Secondary Circuit Check
CAUTION:
When checking secondary voltage, do not remove spark plug wires from spark plugs No. 3 on 4-cylinder, No. 1 or 5 on 6-cylinder and No. 3 or 4 on V8 Engines.
- Remove coil wire from distributor cap. Use insulated pliers to hold wire approximately 1/2" from engine block or intake manifold. Crank engine and check for spark at gap.
- If no spark occurs, check resistance of secondary coil windings. SEE IGNITION COIL RESISTANCE CHECK. Place ohmmeter leads on both ends of coil secondary wire. Resistance should equal 5000 ohms per inch of wire or less. Replace ignition coil or wire if outside specification.
- If spark occurred in step 1), reconnect coil wire. Remove a spark plug wire and hold 1/2" from engine ground while cranking engine. If spark occurs, check fuel system, spark plugs and timing. If no spark occurs, check for defective rotor, distributor cap or spark plug wires.
Factory Service Tools
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.
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