A fuel-injected engine uses many contrary sensors to arbitrate accomplish your engine amble properly. The 1987 and newer GM trucks operate one or another O2 sensors located along the exhaust. They're not arduous to modify, on the contrary they can grip some elbow grease and some basic safety Accoutrement to effect properly.
Instructions
Lift the Truck
1. Antecedent, produce decided the vehicle is turned off, has cooled down for a scarce hours and the emergency brake is allot. Using a jack, lift the front of the Motor lorry so that the front tires are off the ground. A congenial jack objective is the front crossmember, or alternatively, the sides of the frame below the doors.
2. With the Motor lorry properly supported, slide underneath the vehicle and gun for the Oxygen sensor. Depending on the year of the Motor lorry, there Testament be fair-minded one sensor located on the passenger side near the transmission, or indefinite sensors on the following models, located both before and after the catalytic converters. They're basic to spot, as they stick absent approximately 2 inches from the exhaust tubing and corner two wires ultimate away from the item.
3. Unplug the harness that connects the O2 sensor to the stock wiring. To reinstall, thread the O2 sensor into the bung on the exhaust, reconnect the wiring and lower the truck off of the jackstands.
Should the sensor be stuck in the threads, loosen them with some WD-40 or similar product. Should the sensor still not come loose, the bung can be cut out of the exhaust, but it will have to be welded back into place by a professional, and should only be done as a last resort.
5. Before installing the replacement O2 sensor, put some anti-seize compound around the threaded area of the sensor. This will help you the next time you have to replace the sensor, as the heat of the exhaust won't cause the threads to grab up on you.
6. If the clip that holds the harness together is difficult to disconnect, use a small flathead screwdriver to pop it free.4. Using an O2 sensor socket or an appropriately sized wrench, loosen and remove the old O2 sensor. It unthreads like any other bolt would, going to the left to loosen.
