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.
1980 Plymouth Champ Custom, Automatic TransFACTORY OEM SERVICE PROCEDURE
Detonation Sensor Test
NOTE:
Detonation sensor is used only on Calif. V8 engines.
- Connect a variable timing light to engine. Start engine and run it on second highest step of fast idle cam (at least 1200 RPM).
- Tap lightly on intake manifold near the sensor with a small metal object. Using the timing light, look for a decrease in timing. The amount of decrease will be directly proportional to the strength and frequency of the tapping.
- If sensor fails to perform as specified, replace sensor and repeat test. If new sensor still fails to perform properly, check wiring back to computer.
Factory Service Tools
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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.