Engine Compression Inspection

NOTE: After this inspection, you must reset the PCM. Otherwise, the PCM will continue to stop the injectors from operating.

1. Engine - Warm Up
1.
Start the engine. Hold the engine speed at 3,000 rpm with no load (in P or N) until the radiator fan comes on, then let it idle.


NOTE: For specific operations, refer to the user's manual that came with the HDS. Make sure the HDS is loaded with the latest software.

3. ALL INJECTORS STOP - Select
1.
Select ALL INJECTORS STOP in the PGM-FI INSPECTION menu with the HDS.
2.
Turn the vehicle to the OFF (LOCK) mode.

5. Engine Compression - Inspect
1.
Attach a compression gauge to the spark plug hole.
2.
Step on the accelerator pedal to open the throttle fully, then crank the engine with the starter motor, and measure the compression.
Compression Pressure:
Above 930 kPa (9.48 kgf/cm2, 134.8 psi)
3.
Measure the compression on the remaining cylinders.
Maximum Variation:
Within 200 kPa (2.04 kgf/cm2, 29.0 psi)
4.
If the compression is not within specifications, perform a cylinder leak down test to determine the problem area. Then check the following items, and remeasure the compression:
Incorrect valve clearance
Confirmation of camshaft timing
Damaged or worn cam lobes
Damaged or worn valves and seats
Damaged cylinder head gasket
Damaged or worn piston rings
Damaged or worn piston and cylinder bore
5.
Remove the compression gauge from the spark plug hole.

6. All Removed Parts - Install
1.
Install the parts in the reverse order of removal.

7. ALL INJECTORS STOP - Cancel
1.
Select PCM reset in the PGM-FI mode menu to cancel ALL INJECTORS STOP with the HDS.