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How to Change the Exhaust Manifold on a 1995 Lumnia

The exhaust manifold, also known as a header, on the Chevy Lumina collects the exhaust gases from the engine cylinders and diverts them through the exhaust pipe. If the manifold develops cracks, you will need to change it or the efficiency of the engine will drop. This is a project that you can do yourself, so there is no need to take the Lumina to an automotive repair shop. You can expect it to take you about three hours to complete the project.

Instructions

1

Disconnect the negative cable from the battery using a wrench to loosen the terminal nut. Disconnect the wiring harness from the oxygen sensor. Turn the belt tensioner using a wrench and relieve the tension from the serpentine belt. Note the proper routing of the belt if the diagram is missing.

2

Remove the serpentine belt from the Lumina engine. Remove the bolts from the alternator using a socket and ratchet and take it off the engine. Place the wheel chocks behind the rear wheels of the Lumina. Lift the front of the car with the automobile jack. Place the jack stand under the Lumina near the jacking point and raise it to the frame.

3

Remove the bolts retaining the exhaust pipe to the manifold using a wrench. Remove the jack stand from under the Lumina and lower the car to the ground. Remove the oil fill tube from the engine block using a wrench. Pull the tube away from the engine. Remove the nuts from the exhaust manifold using a socket and ratchet. Remove the manifold from the engine.

4

Remove the manifold gasket and discard it. Install a new gasket and exhaust manifold. Secure the nuts using a socket and ratchet. Install the oil fill tube and tighten the nut with a wrench. Raise the Lumina with the automobile jack. Place the jack stand under the car near the jacking point and raise it to the frame.

5

Crawl under the Lumina and connect the exhaust pipe to the manifold. Tighten the bolts with a wrench. Remove the jack stand from under the Lumina. Lower the car to the ground. Install the alternator and tighten the bolts with a socket and ratchet. Install the serpentine belt according to the diagram you made, or the one under the engine hood if present.

6

Place tension on the serpentine belt by turning the belt tensioner with a wrench. Connect the electrical connection to the oxygen sensor. Connect the negative cable to the battery and tighten the terminal nut with a wrench.