Nissan Maxima Service and Repair Manual: Compression Pressure

On-Vehicle Service

CHECKING COMPRESSION PRESSURE

Nissan Maxima. CHECKING COMPRESSION PRESSURE

  1. Run the engine until it reaches normal operating temperature.
  2. Turn the ignition switch to OFF.
  3. Release fuel pressure. Refer to EC-592, "Inspection".
  4. Remove all six spark plugs.

    Refer to EM-12, "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).

Nissan Maxima. CHECKING COMPRESSION PRESSURE

  • Always use a fully-charged battery to obtain specified engine speed.
  • If the engine speed is out of the specified range check the battery and recharge as necessary. Check the engine speed again with the battery properly charged.
  • If some cylinders have low compression pressure, pour a small amount of engine oil into the spark plug hole of the cylinder to re-check it for compression.
  • If the added engine oil improves the compression, piston rings may be worn out or damaged. Check the piston rings and replace if necessary
  • If the compression pressure remains at low level despite the addition of engine oil, the valves may be malfunctioning. 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, cylinder head gaskets may be leaking, or a valve in adjacent cylinders may be damaged. Inspect and repair as required.
  • If the compression pressure is below the minimum value, check the valve clearances and parts associated with the combustion chamber (valve, valve seat, piston, piston ring, cylinder bore, cylinder head, cylinder head gasket). After the checking, measure the compression pressure again.
    Camshaft Valve Clearance
    Valve Clearance CHECKING NOTE: Perform inspection as follows after removal, installation or replacement of camshaft or valve related parts, or if there are unusual engine conditions rega ...

    Removal And Installation
    ...

    Other materials:

    Headlamp
    System Diagram System Description Control of the headlamp system operation is dependent upon the position of the combination switch (lighting and turn signal switch). When the lighting switch is placed in the 2nd position, the BCM (body control module) receives input requesting the headlam ...

    Key slot illumination
    Description Blinks when Intelligent Key insertion is required. Component Function Check 1. CHECK FUNCTION With CONSULT Check key slot illumination KEY SLOT ILLUMI in Active Test mode. Diagnosis Procedure 1. CHECK KEY SLOT ILLUMINATION OUTPUT SIGNAL Check voltage between key slot connector ...

    B2618 BCM
    Description BCM controls the various electrical components and simultaneously supplies power according to the power supply position. BCM checks the power supply position internally. DTC Logic DTC DETECTION LOGIC NOTE: If DTC B2618 is displayed with DTC U1000, first perform the trou ...

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    Nissan Maxima Service and Repair Manual

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