OEM 2004 Chevrolet Impala Exhaust Manifold

2004 Chevrolet Impala Exhaust Manifold Parts Questions & Experts Answers

• Q: How to replace the right exhaust manifold (3.8L) on 2004 Chevrolet Impala?

  A: The right Exhaust Manifold replacement for a 3.8l engine starts with deleting the cross vehicle brace combined with the fuel injector sight shield and the exhaust crossover heat shield nuts until removing the heat shield itself. You must first detach bolts from the exhaust crossover pipe which connects to the right Exhaust Manifold twice before lifting the vehicle and proceeding. First lower the vehicle before removing both Exhaust Manifold pipe stud nuts and catalytic converter pipe. To access the right side of the engine you should first rotate it then disconnect the heated oxygen (HO2S) sensor electrical connector and take out the sensor from the engine sight shield bracket. The repair starts with clearing spark plugs from cylinders 2, 4 and 6 followed by removing the right engine lift bracket bolt then subsequent removal of the bracket itself. Remove the fuel injector sight shield bracket nuts followed by the bracket before removing the right Exhaust Manifold bolts and nuts to take out the manifold together with its gasket. Users must eliminate both upper and lower heat shields from the right Exhaust Manifold while extracting the heated Oxygen Sensor (HO2S) from the manifold when replacing it. After Exhaust Manifold cleaning the technician should reinstall combustion manifold studs when they were initially deleted. The installation sequence starts with attaching the heated Oxygen Sensor (HO2S) to the new manifold before setting both upper and lower right Exhaust Manifold heat shields onto position. Finish with a fresh right Exhaust Manifold Gasket. The right Exhaust Manifold needs to be installed with bolts and nuts secured to 30 nm (22 ft. Lbs.). Install the fuel injector sight shield bracket using 30 nm (22 ft. Lbs.) torque setting while applying the same torque to right engine lift bracket nuts and its bolt. Insert the new spark plugs into the right side engine cylinders while doing so you connect the heated Oxygen Sensor (HO2S) electrical connector to the engine sight shield bracket for sensor reconnection. The egr valve inlet adapter pipe should be mounted on the right Exhaust Manifold while the bolt receives a torque adjustment to 29 nm (21 ft. Lbs.). Lower the vehicle while you attach the catalytic converter pipe with its stud nuts to the right Exhaust Manifold and complete tightening to 32 nm (24 ft. Lbs.). The right Exhaust Manifold requires installation of the exhaust crossover bolts which need to be tightened to 20 nm (15 ft. Lbs.). The process continues with installing and tightening exhaust crossover heat shield nuts to 20 nm (15 ft. Lbs.). The last step involves installing the struts of the engine mount and fuel injector sight shield and cross vehicle brace.