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 MANUALSJEEP1987WRANGLER S, 4.2 C, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEM2.5L TBI SYSTEMOPERATIONIGNITION ADVANCE CONTROL
1987 Jeep Wrangler S, 4.2 C, Automatic
Ignition Advance Control
1987 Jeep Wrangler S, 4.2 C, AutomaticSECTION Ignition Advance Control
Under certain engine operating conditions, the predetermined ignition advance curve is modified. This is accomplished through 2 switching circuits that connect the ECU and the ignition control module.
RENDER: 1.0x
NO RELATED
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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.