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 MANUALSFORD1987CUTAWAY 7.5 LREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCEIGNITION SYSTEMIGNITION SYSTEM - DURA-SPARK IITESTINGSPARK PLUG WIRE RESISTANCE
1987 Ford Cutaway 7.5 L
Spark Plug Wire Resistance
1987 Ford Cutaway 7.5 LSECTION Spark Plug Wire Resistance
- Remove distributor cap and disconnect spark plug end of suspected wire(s). Connect ohmmeter leads from terminal inside distributor cap to end of spark plug wire. DO NOT puncture spark plug wire when measuring resistance.
- If resistance is below 7000 ohms per foot, spark plug wire is okay. If resistance is over 7000 ohms per foot, replace wire(s). After test, install distributor cap and connect spark plug wire(s).
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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.