Nissan Altima L32. Manual - part 622

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COMPRESSION PRESSURE

• If the compression pressure remains at low level despite the addition of engine oil, the valves may be mal-

functioning. Check the valves for damage. Replace the valve or valve seat accordingly.

• If two adjacent cylinders have respectively low compression pressure and their compression remains low

even after the addition of engine oil, the head gasket is leaking. In such a case, replace the cylinder head

gasket.

8. Install spark plug, ignition coil and harness connectors.

AIR CLEANER AND AIR DUCT

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ON-VEHICLE REPAIR

AIR CLEANER AND AIR DUCT

Removal and Installation

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REMOVAL

1. Remove front air duct.
2. Disconnect the air duct hose clamps at the electric throttle control actuator and the air cleaner assembly.
3. Remove air duct hose.
4. Disconnect the mass air flow sensor
5. Remove mass air flow sensor from air cleaner assembly, as necessary.

CAUTION:

Handle the mass air flow sensor with care:

• Do not shock it.

• Do not disassemble it.

• Do not touch the internal sensor.

6. Remove the air cleaner assembly, as necessary.

INSTALLATION

Installation is in the reverse order of removal.

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1.

Air duct hose

2.    Front air duct

3.

Air cleaner mounting bracket

4.

Air cleaner assembly

5.

Mass air flow sensor

A. To electric throttle control actuator

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INTAKE MANIFOLD

INTAKE MANIFOLD

Removal and Installation

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REMOVAL

WARNING:

To avoid the danger of being scalded, never drain the coolant when the engine is hot.
1. Release the fuel pressure. Refer to 

EC-550, "Inspection"

 (California), 

EC-1038, "Inspection"

 (Except Cali-

fornia).

2. Drain coolant when engine is cooled. Refer to 

CO-12, "Changing Engine Coolant"

.

3. Disconnect the MAF sensor electrical connector.
4. Remove air cleaner and air duct assembly. Refer to 

EM-25, "Removal and Installation"

.

5. Remove cowl top finisher. Refer to 

EXT-18, "Removal and Installation"

.

6. Disconnect the following components at the intake side:

• PCV hose

• EVAP hose and EVAP canister purge volume control solenoid

• Electric throttle control actuator

• Brake booster vacuum hose

7. Disconnect the fuel quick connector on the engine side.

• Using Tool perform the following steps to disconnect the quick connector. 

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1.

Intake manifold

2.

Rubber seal

3.

Intake manifold adapter

4.

Gasket

5.

Electric throttle control actuator

6.

Rubber seal

7.

PCV hose

8.

EVAP canister purge volume control 
solenoid valve

9.

EVAP hose

Tool number

: 16441 6N210 (J-45488)

INTAKE MANIFOLD

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a. Remove quick connector cap.

b. With the sleeve side of Tool facing quick connector, install Tool

onto fuel tube.

c. Insert Tool into quick connector until sleeve contacts and goes

no further. Hold the Tool on that position.

CAUTION:

Inserting the Tool hard will not disconnect quick connector.

Hold Tool where it contacts and goes no further.

d. Pull the quick connector straight out from the fuel tube.

CAUTION:

• Pull quick connector holding it at the (A) position, as

shown.

• Do not pull with lateral force applied. O-ring inside quick

connector may be damaged.

• Prepare container and cloth beforehand as fuel will leak out.

• Avoid fire and sparks.

• Be sure to cover openings of disconnected pipes with plug or plastic bag to avoid fuel leakage

and entry of foreign materials.

8. When removing fuel hose quick connector at vehicle piping side, perform as follows.
a. Remove quick connector cap.
b. Hold the sides of the connector, push in tabs and pull out the

tube. (The figure is shown for reference only.) 

• If the connector and the tube are stuck together, push and pull

several times until they start to move. Then disconnect them

by pulling.

CAUTION:

• The tube can be removed when the tabs are completely

depressed. Do not twist it more than necessary.

• Do not use any tools to remove the quick connector.

• Keep the resin tube away from heat. Be especially careful

when welding near the tube.

• Prevent acid liquid such as battery electrolyte etc. from getting on the resin tube.

• Do not bend or twist the tube during installation and removal.

• Do not remove the remaining retainer on tube.

• When the tube is replaced, also replace the retainer with a new one.

Retainer color: Green.

• To keep clean the connecting portion and to avoid damage and foreign materials, cover them

completely with plastic bags or something similar.

9. Disconnect electric throttle control actuator coolant hoses.
10. Loosen bolts diagonally, and remove the electric throttle control actuator. 

CAUTION:

Handle carefully to avoid any damage.

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