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 MANUALSPEUGEOT1982505 STI, 2.0L ENG VIN 1, AUTOMATIC TRANSREPAIR AND DIAGNOSISENGINE PERFORMANCEENGINE CONTROL SYSTEMSDECELERATION SYSTEMTESTING
1982 Peugeot 505 STI, 2.0L Eng VIN 1, Automatic Trans
Deceleration System: Testing
1982 Peugeot 505 STI, 2.0L Eng VIN 1, Automatic TransSECTION Testing
- With engine temperature below 104°F (40°C), disconnect the top wire from the thermocontact. Start engine and accelerate to 1800 RPM or more.
- Quickly release throttle. If operation of deceleration valve can be heard, system is good. Reconnect wire.
- If deceleration valve could not be heard, disconnect deceleration valve connector. Connect test lamp to connector.
- Again accelerate to 1800 RPM or more and quickly release throttle. If test lamp comes on then goes off, check vacuum hose routing. If connections are good, replace deceleration valve.
- If test lamp does not come on, check electrical connections, 2-speed relay and adjustment of microswitch. See ADJUSTMENTS . If all are okay, replace deceleration relay.
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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.