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
Engine Starting Problems
- Check all ESC harness connections, including 10-pin connector at ESC controller, 4-pin connector at distributor, 2-blade male connector to distributor, and 2-blade female connector to ignition switch lead (Pink wire). Repair connections as necessary.
- If all connections are okay, disconnect 4-pin connector at distributor. Install jumper wire between pins "A" and "C" of distributor connector. If engine will not start, check other causes of engine failing to start.
- If engine starts with jumper wire connected, remove jumper wire and attach 4-pin connector to distributor. With ignition on, attach voltmeter positive lead to pin "F" and negative lead to pin "K" on 10-pin connector.
- If under 11.6 volts, repair circuit between ignition switch and pin "F". If over 11.6 volts are read, check wires in ESC harness from pins "G", "H", "J" and "K" of 10-pin connector for opens or shorts. If harness is okay, replace ESC controller.
Factory Service Tools
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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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