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 MANUALSFORD1985BRONCO 5.8 G, STANDARD, NP435REPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCEIGNITION SYSTEMIGNITION SYSTEM - DURA-SPARK IITESTINGNOTES
1985 Ford Bronco 5.8 G, Standard, NP435
Ignition System - DURA-Spark II: Testing: Notes
1985 Ford Bronco 5.8 G, Standard, NP435SECTION Notes
NOTE:
All wire colors shown refer to colors of electronic control module wires. For example, "the Green wire leading to the coil" would refer to any colored wire leading to the coil, that connects to the module's Green wire. Therefore, when making tests, wires must be traced back to control module for proper color identification. Also, when a test is completed and a problem is found, make the necessary repair and repeat the failed test to be sure that the problem has been corrected.
When checking the secondary voltage, do not remove the following spark plug wires while the engine is running or cranking:
- Plug No. 1 or 8 on V8 engines.
- Plug No. 3 or 5 on 6 cylinder engines.
- Plug No. 1 or 3 on 4 cylinder engines.
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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.