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How Do I Replace an Oxygen Sensor in a 1985 Chevy S 10 Blazer

The single oxygen sensor on the 1985 Chevy S-10 Blazer is a more primitive design than todays O2 sensors. Its erred to as a non-heated single (one) wired sensor. While it functions similarly to todays sensors, it demands that the engine is up to operating temperature, including the engine coolant, before it begins to monitor the fuel-to-air ratio. Todays sensors have multiple wires with built-in heaters that heat them up quickly to begin monitoring the emissions more readily. This lessens the amount of pollutants allowed into the air while the vehicle is warming up.

Instructions

1

Apply the parking brake of the 1985 Chevy S-10 Blazer and then open the hood. Access to the oxygen sensor is on the lower side of the engine, but youll have more adequate lighting with the hood opened.

2

Hoist one front quarter of the Blazer up with a jack placed under the frame rail and then lower the jack and Blazer onto a jack stand. Repeat for the other front quarter to elevate the front end completely.

3

Put on the safety glasses and crawl underneath the Blazer with the remaining items.

4

Follow the front exhaust pipe to where it connects to the manifold on the drivers side to locate the oxygen sensor.

5

Follow the wire coming off the end of the oxygen sensor to the wire harness plug mating connection to the oxygen sensor plug. Lift up the release tab of the wire harness plug and then pull the oxygen sensor plug out.

6

Put the oxygen sensor socket onto the ratchet and then align the wire of the sensor into the slit on the side of the socket.

7

Place the socket fully onto the hex-head of the sensor and then turn the ratchet counterclockwise to remove it from the sensor exhaust port. Remove the sensor.

8

Inspect the replacement oxygen sensor threads. If there is no anti-seize compound on the threads, apply a thin coating of electrically conductive anti-seize compound to the threads, being caul not to get the compound on the head of the sensor.

9

Hand-thread the replacement sensor into the oxygen sensor exhaust port as far as it will go.

10

Tighten the sensor snugly with the ratchet and oxygen sensor socket (placing the sensor wire into the socket slit), but do not over-tighten it. The threads of the sensors are made of much softer metal than the exhaust system to prevent damaging the mating threads of the system. Because of this, its easy to strip the threads of the sensors.

11

Connect the sensor wire plug to the mating plug of the wire harness until the lock clicks into place.

12

Lower the Blazer and close the hood.

Posted by Unknown at 6:45 AM

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