Nissan 14002-3S600 Exhaust Manifold With Catalytic Converter Passenger Side

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To check for a restricted converter, you can use a vacuum gauge to diagnose the effect of a blocked exhaust on intake vacuum. Connect a vacuum gauge to an intake manifold vacuum source, warm the engine to operating temperature, and record the vacuum readings at idle and at 2000 rpm. If the reading after the fourth test is more than one in-Hg lower than the reading recorded at idle, it may indicate a plugged or restricted catalytic converter.

Position new gaskets over the cylinder head studs. Install the manifold and thread the mounting nuts into place. Working from the center out, tighten the nuts to the specific torque in three or four equal steps.

Install the manifold and thread the mounting nuts into place.

Disconnect the cable from the negative terminal of the battery. Block the rear wheels and set the parking brake.

Whenever the vehicle is raised for underbody servicing, it's important to check the converter for leaks, corrosion, dents, and other damage. Also, check the welds/flange bolts that attach the front and rear ends of the converter to the exhaust system. If damage is found, the converter should be replaced.

Disconnect the electrical connector from the oxygen sensor.

Remove the lower splash shield from below the engine if equipped.

Working under the vehicle, disconnect the front exhaust pipes from the vehicle. On California models, detach the heat shields from the pre-catalytic converter, disconnect the oxygen sensor connectors, and remove the pre-cat from the exhaust manifold. If both exhaust manifolds are being removed, both pre-catalytic converters or front exhaust pipes must be removed. On 2WD models, remove the front suspension crossmember first, to facilitate removal of the front exhaust pipes.