GM 12616285
Exhaust Manifold, Driver Side

The first step to replace the left Exhaust Manifold requires removing ignition coils and spark plugs before elevating the vehicle with support. Start by removing Exhaust Manifold pipe nuts then lower the automobile. After removing Exhaust Manifold bolts and manifold along with the gasket the old gasket should be discarded. In some cases the Exhaust Manifold heat shield will need to be unbolted along with its shield before removal. An inspection and cleaning process should be performed on the Exhaust Manifold unless the replacement plan includes new manifold installation. When performing an installation the heat shield and bolts need to be attached to the Exhaust Manifold before tightening them to 9 nm (80 inch lbs.). To prepare the bolt holes for installation, inspect and clean the threads on Exhaust Manifold bolt holes before omitting threadlock material from the initial three bolt threads. The thread ends of Exhaust Manifold bolts require a 5 mm (0.2 inch) wide application of threadlock gm p/n 12345493 (Canadian P/N 10953488) or its equivalent product. Start by tightening the center bolts followed by progressive side-to-side movement of bolt tightness toward the outside bolts until reaching 15 nm (11 ft. Lbs.) and complete this process once again with a final tightening to 25 nm (18 ft. Lbs.). Establish a flat surface on the Exhaust Manifold gasket at the left cylinder head rear section by bending it with a flat punch. Position the vehicle for the second time before adding and torquing the Exhaust Manifold pipe nuts to 50 nm (37 ft. Lbs. Torque). You should install spark plugs and ignition coils after lowering the vehicle.

The first step for replacement of the left Exhaust Manifold involves removal of the wheelhouse panel. A one-half turn clockwise twist on the Spark Plug boot will let you release it and you should grip only the boot portion to protect the wire. To begin pull off the Spark Plug Wires from both the spark plugs and ignition coils. Then continue by removing the spark plugs. First raise and support the vehicle before removing the bolts and nuts from the Exhaust Manifold heat shield to separate the left Exhaust Manifold heat shield from its position. The work sequence begins by lowering the vehicle before experts remove Exhaust Manifold bolts and nuts to finally extract the Exhaust Manifold from position. Dispose of the old Exhaust Manifold Gasket along with checking the manifold for reuse only if the condition allows. Use a new gasket to mount the Exhaust Manifold before tightening the Exhaust Manifold bolt to 35 nm (26 ft. Lbs.) and the nuts to 16 nm (12 ft. Lbs.). After another vehicle lift you can install the Exhaust Manifold heat shield using proper bolt and nut arrangement which requires tightening to 25 nm (18 ft. Lbs.). Use the vehicle hoist to lower it down before inserting spark plugs and taking care to completely install the Spark Plug wire by pushing on its exposed boot section rather than using metal heat shields. Reinstall the wheelhouse panel while connecting the Spark Plug Wires to both spark plugs and ignition coils.

Followed by a final tightening to 20 N.m (15 lb ft) using the same pattern.

First, drain the cooling system if rear air conditioning is equipped.

Position and install the exhaust manifold heat shield and bolts, tightening them to 9 N.m (80 lb in).

Partially lower the vehicle to access the wheel opening, then twist the boot a 1/2 turn and pull on the boot to remove the spark plug wires.

To prevent issues with vehicle emissions and On-Board Diagnostics (OBD) II system performance.

Raise the vehicle again to install the exhaust manifold pipe nuts, tightening them to 50 Nm (37 ft. lbs.), then lower the vehicle.

No, do not apply sealant to the first three threads of the bolt.

Remove the engine cover, disconnect the EGR valve pipe from the exhaust manifold if equipped, and take out the spark plug wires.

The right fender wheelhouse extension.

Take off the spark plug wires from the spark plugs and ignition coils, then remove the spark plugs.

Clean and inspect the exhaust manifold.

Remove the spark plug wires from the spark plugs and ignition coils, followed by the spark plugs themselves.

Remove the right exhaust manifold bolts and nuts in the correct sequence.

Position the exhaust manifold to the cylinder head and tighten the exhaust manifold bolts to 15 Nm (11 lb ft) on the first pass and 25 Nm (18 lb ft) on the second pass.

Remove the catalytic converter from the exhaust manifold.

Remove the spark plug wires from the spark plugs, then take out the exhaust manifold bolts and remove the exhaust manifold from the vehicle.

Remove the spark plug wires.

Apply a 5 mm (0.2 in) wide band of threadlock GM P/N 12345493.

Inspect the gasket surface for excessive scratches or gouging, check for any loose or damaged heat shield, and examine the exhaust pipe studs for damaged threads.

Begin by installing the exhaust manifold and bolts.

Raise and support the vehicle.

If required, install the exhaust manifold heat shield and bolts, tightening them to 9 Nm (80 inch lbs.).

Remove the exhaust manifold to catalytic converter seal and discard it.

Begin by removing the heated oxygen sensor (HO2S).

Clean and inspect the exhaust manifold.

Raise and support the vehicle.

Discard the old exhaust manifold gaskets.

Begin by removing the wheelhouse panel and the oil level indicator tube.

Install the spark plugs, raise the vehicle, and install the exhaust manifold pipe nuts, tightening them to 50 Nm (37 ft. lbs.) before lowering the vehicle.

Install the heat shield and bolts to the exhaust manifold, tightening the bolts to 9 Nm (80 inch lbs.).

They should be clean and free of debris or threadlocking material.

The oil level indicator tube and spark plug wires to the spark plugs and ignition coils.

First, raise and support the vehicle.

Tighten them to 50 Nm (37 ft. lbs.) before lowering the vehicle.

Remove the heat shield bolts and shield from the exhaust manifold.

Apply a 5 mm (0.2 inch) wide band of threadlock GM P/N 12345493 (Canadian P/N 10953488) or equivalent to the threads.

Install the exhaust manifold heat shield and bolts if required, tightening them to 9 Nm (80 inch lbs.).

If necessary, remove the heat shield bolts and shield from the exhaust manifold.

Remove the spark plugs and disconnect the Engine Coolant Temperature (ECT) sensor electrical connector.

Remove the exhaust manifold heat shield bolts and the shield.

First, remove the catalytic converter from the exhaust manifold.

Lower the vehicle and take off the exhaust manifold heat shield bolts and shield.

15 Nm (11 ft. lbs.).

Reinstall the spark plugs.

Install the exhaust manifold.

Apply a 5 mm (0.2 inch) wide band of threadlock GM P/N 12345493 (Canadian P/N 10953488) or equivalent to the threads of the exhaust manifold bolts.

Apply threadlock GM P/N 12345493 (Canadian P/N 10953488).

Lower the vehicle.

Disconnect the EGR valve pipe from the exhaust manifold.

Bend the gasket tab at the rear around the cylinder head edge.

Remove the catalytic converter to exhaust manifold nuts.

Bend over the exposed edge of the exhaust manifold gasket at the rear of the left cylinder head with a flat punch.

Raise and support the vehicle again, install the heat shield, and secure it with bolts and nuts tightened to 25 Nm (18 ft. lbs.).

Remove the heat shield bolts and shield from the exhaust manifold.

Install the heat shield and bolts to the exhaust manifold, tightening the bolts to 9 Nm (80 inch lbs.).

Place a new exhaust manifold gasket and install the exhaust manifold, tightening the bolt to 35 Nm (26 ft. lbs.) and the nuts to 16 Nm (12 ft. lbs.).

If required, install the exhaust manifold heat shield and its bolts, tightening them to 9 Nm (80 inch lbs.).

Inspect the O-ring seal (421) for damage, replacing it if necessary and lubricating it with clean engine oil.

Twist the wire boot a 1/2 turn and pull only on the boot.

Install a new catalytic converter seal and position the new exhaust manifold gasket and exhaust manifold to the cylinder head, ensuring it is seated to the catalytic converter.

Install the bolts and tighten them to 15 Nm (11 ft. lbs.) on the first pass and then to 25 Nm (18 ft. lbs.) on the second pass.

Mark the relationship of the upper intermediate steering shaft to the steering column.