Nissan Altima 2007-2012 Service Manual: Compression pressure

On-Vehicle Service

CHECKING COMPRESSION PRESSURE

1. Run the engine until it reaches normal operating temperature.

2. Turn the ignition switch to OFF.

3. Release fuel pressure and leave the fuel pump electrically disconnected.

Refer to EC-1579, "Inspection".

4. Remove all six spark plugs.

Refer to EM-119, "Removal and Installation".

5. Attach a compression tester to No. 1 cylinder.

6. Depress accelerator pedal fully to keep the electric throttle control actuator butterfly-valve wide open to maximize air intake flow.

7. Crank the engine and record the highest gauge indication

8. Repeat the measurement on each cylinder (steps 5 - 7).

• Always use a fully-charged battery to obtain specified engine speed.

9. If compression in one or more cylinders is low: a. Pour a small amount of engine oil into cylinders through the spark plug holes.

b. Retest compression (steps 5 - 8).

• If adding oil helps raise compression pressure, then the piston rings may be worn or damaged. If so, replace piston rings after checking piston.

• If the pressure stays low, a valve may be sticking or is seating improperly. Inspect and repair the valve and/or valve seat. Refer to EM-229, "Camshaft". If the valve and/or valve seat is damaged excessively, replace as necessary.

• If compression stays low in two or more cylinders that are next to each other: - The cylinder head gasket may be leaking.

- Both cylinders may have valve component damage. Inspect and repair as necessary.

    Camshaft valve clearance
    Valve Clearance CHECKING • Perform inspection as follows after removal, installation or replacement of camshaft or valve related parts, or if there is unusual engine conditions regarding valve c ...

    Other materials:

    Steering wheel
    Inspection INSTALLATION CONDITION • Check installation conditions of steering gear assembly, front suspension assembly, axle and steering column assembly. • Check if movement exists when steering wheel is moved up and down, to the left and right and to the axial direction. Steering w ...

    Front drive shaft
    Removal and Installation (Left Side) 1. Drive shaft 2. Cotter pin REMOVAL 1. Remove wheel and tire. Refer to WT-66, "Adjustment". 2. Remove wheel sensor from steering knuckle. Refer to BRC-63, "Removal and Installation" (ABS), BRC- 134, "Removal and Installation& ...

    P0181 FTT sensor
    Description The fuel tank temperature sensor is used to detect the fuel temperature inside the fuel tank. The sensor modifies a voltage signal from the ECM. The modified signal returns to the ECM as the fuel temperature input. The sensor uses a thermistor which is sensitive to the change in te ...