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 MANUALSFORD1990RANGER 4WD L4-140 2.3L SOHCREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTIGNITION SYSTEMSERVICE AND REPAIR
1990 Ford Ranger 4WD L4-140 2.3L SOHC
Ignition System: Service and Repair
1990 Ford Ranger 4WD L4-140 2.3L SOHCSECTION Service and Repair
IGNITION COILS
Wipe coil towers with a clean dampened cloth (soap & water only). After removing any soap film and drying with compressed air, inspect coils for cracks, dirt, and carbon tracks.
SPARK PLUG WIRES
Prior to inspection, wipe wires clean with damp cloth. While inspecting wires for visible damage such as cuts, cracks, pinches, or torn boots, take care not to remove high tension wires from the spark plugs or coils. Replace damaged wires as necessary.
RENDER: 1.0x
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Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.