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 DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCEIGNITION SYSTEMTESTINGDETONATION SENSOR
1987 Chrysler Fifth Avenue 5.2 4
Detonation Sensor
1987 Chrysler Fifth Avenue 5.2 4SECTION Detonation Sensor
- Connect an adjustable timing light or magnetic timing light to the engine. Start engine and run it to at least 1200 RPM. Connect an auxiliary vacuum supply to vacuum transducer and apply 16 in. Hg. Tap lightly on intake manifold near detonation sensor with a small metal object.
- Using a timing light look for a decrease in spark advance. The decrease in timing should directly respond to the strength of the tapping. The maximum decrease in timing is 20 degrees. Shut off engine and disconnect timing light.
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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.