Question 1

How to work on the intake manifold collector on Nissan Altima?

Accepted Answer

To work on the intake manifold collector, start by removing the engine cover and the cowl cover, then disconnect the cable from the negative terminal of the battery. Next, remove the front air intake duct and hose, clamp off the hoses leading to the throttle body, and disconnect them. Label and disconnect the hoses and electrical connectors attached to the intake manifold collector and throttle body, including the brake booster vacuum hose, EVAP purge hose, PCV hose, throttle body wiring, and fuel injector wiring connectors, as well as the vacuum hoses from the VIAS system. Move the EVAP purge valve aside after removing its mounting bolt, then loosen and remove the intake manifold collector bolts in the reverse of the tightening sequence, taking care to clean the mounting surfaces and install new gaskets before reattaching the collector and tightening the bolts in the proper sequence. The installation process is the reverse of removal, and check the coolant level, adding as necessary. Reconnect the battery and perform the necessary re-learn procedures. For the lower intake manifold, relieve the fuel pressure and drain the engine coolant before removing the intake manifold collector. Detach the fuel rail and injectors, label and detach any remaining hoses that may interfere with the lower intake manifold removal, then loosen the manifold bolts in reverse order. Remove the manifold, taking care not to damage the gasket sealing surfaces, and use a scraper to clean all traces of old gasket material and sealant from the manifold and cylinder heads. Check the flatness of the top surface of the manifold with a precision straightedge and feeler gauge, replacing it if excessive. Install new gaskets, position the lower manifold on the engine, align the gaskets and manifolds over the studs in the cylinder heads, and install the bolts, tightening them to the specified torque in the correct sequence. Complete the installation in reverse order, reconnect the battery, and perform the necessary re-learn procedures.

Question 2

How to remove the upper and lower intake manifold on 3.3L V6 Nissan Frontier?

Accepted Answer

To remove the upper intake manifold (plenum), begin with disconnecting the negative battery cable and removing the air intake duct. Disconnect throttle body accelerator, control cruise throttle cable, if any, hoses, and electrical connectors, and remove the spark plug wires and distributor cap. Hoses, electrical connectors are labeled, ground strap removed and upper intake manifold bolts become loose in reverse order. Remove the upper plenum with the attached throttle body. To install the upper manifold, clean the mounting surfaces, install a new gasket, and tighten the bolts to the specified torque. Reconnect hoses and electrical connectors, and refill as necessary coolant. For lower intake manifold first relieve fuel pressure then disconnect negative battery cable. Remove upper intake manifold. Drain cooling system, disconnect electrical connections, detach radiator hose from thermostat housing; label & detach vacuum hoses. Remove fuel rail & injectors; also disconnect coolant pipes at transmission end of intake manifold. Loosen manifold mounting bolts/nuts incrementally; carefully use scraper to remove old gasket material & clean mating surfaces. Install new gaskets; position lower manifold; tighten nuts/bolts in a specified sequence to recommended torque. Complete installation by refilling cooling system; changing engine oil; checking for fuel/vacuum/coolant leaks.

Question 3

How to replace the upper intake manifold (plenum) on Nissan Maxima?

Accepted Answer

To replace the upper intake manifold (plenum) on 2001 and earlier models, first relieve the fuel pressure, disconnect the negative battery cable, remove the air intake duct, and take out the ignition coils while labeling and disconnecting the hoses and electrical connectors attached to the plenum and throttle body. Next, remove the EGR guide tube and the upper manifold support brackets from the rear of the upper plenum, noting that the bolts are difficult to access. Loosen the upper intake manifold bolts in reverse order of the tightening sequence and remove the upper plenum with the throttle body attached. For installation, clean the mounting surfaces of the intake manifold and upper plenum with lacquer thinner, install a new gasket with the mark facing forward, and tighten the bolts in the recommended sequence. For 2002 and later models, begin by removing the cowl panel and windshield wiper assembly, then the decorative cover from the engine, and the air cleaner housing. Drain the cooling system and disconnect the coolant hoses from the upper intake manifold. Label and disconnect the vacuum hoses and electrical connectors, free the wiring harnesses and hoses from retainers, unscrew the nuts securing the EGR tube to the lower manifold, and unbolt the canister purge and variable air intake solenoids along with the vacuum tank. Remove the upper manifold's support bracket and the five bolts securing the upper manifold to the lower manifold in a criss-cross pattern, lifting the upper manifold off afterward. For the lower intake manifold, detach any remaining hoses that would interfere with its removal, then remove the fuel rail and injectors. Loosen the manifold mounting bolts/nuts in 1/4-turn increments until they can be removed by hand in reverse order of the tightening sequence. If the manifold is stuck to the cylinder heads, use caution to avoid damaging the gasket sealing surfaces. Carefully scrape off old gasket material and sealant, clean the mating surfaces, install new gaskets, position the lower manifold on the engine, and ensure alignment over the studs in the cylinder heads before installing the nuts. Finally, tighten the nuts/bolts following the recommended sequence and check for fuel, vacuum, and coolant leaks after running the engine.

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