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 MANUALSDODGE AND RAM1983MIRADA 3.7 HREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMELECTRONIC FUEL CONTROL SYSTEMTESTING - ELECTRONIC FUEL CONTROL SYSTEMOXYGEN SENSOR TEST
1983 Dodge and Ram Mirada 3.7 H
Oxygen Sensor Test
1983 Dodge and Ram Mirada 3.7 HSECTION Oxygen Sensor Test
- Set parking brake and connect tachometer. Run engine at 1500 RPM and connect voltmeter to carburetor-to-computer output wire (Green). DO NOT ground carburetor switch. Hold choke blade closed. During the next 10 seconds, the voltage should decrease to 3 volts or less and maintain that level. If engine does not respond, proceeed to step 2).
- Disconnect PCV system. During the next 10 seconds, the voltage should increase to 9 volts or greater and maintain that level until vacuum hose is reconnected. If sensor fails both tests, replace it. Reconnect all hoses and wires.
NOTE:
This test should not be performed for more than 90 seconds.
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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.