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 MANUALSCHRYSLER1987FIFTH AVENUE 5.2 4REPAIR AND DIAGNOSISENGINE PERFORMANCETUNE-UPIGNITION SYSTEMTESTINGCOMPUTER CONTROLLED SPARK ADVANCE TEST
1987 Chrysler Fifth Avenue 5.2 4
Computer Controlled Spark Advance Test
1987 Chrysler Fifth Avenue 5.2 4SECTION Computer Controlled Spark Advance Test
- Warm vehicle engine to normal operating temperature. Place a thin piece of insulating material between curb idle adjusting screw and carb switch (ensure no contact is being made).
- Remove and plug vacuum line at vacuum transducer. Connect auxiliary vacuum supply to vacuum transducer and set vacuum at 16 in. Hg. Increase engine speed to 2000 RPM, wait one minute and compare timing advance against specifications. If correct advance cannot be obtained, replace SCC computer.
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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.