Engine Compression Inspection: Inspection

How to use this manual .

NOTICE:  

• After this inspection, you must reset the PCM - Refer to: PCM Update ()  or PCM Reset () . Otherwise, the PCM will continue to stop the injectors from operating.

1. Engine Compression - Inspect

   Preconditions 

   • Engine Warmed Up

     NOTE:  Warm up the engine by raising the engine speed around 3,000 rpm until the cooling fan(s) comes on.

   • HDS Connected 
   • Spark Plugs Removed

   Courtesy of HONDA, U.S.A., INC.

   Procedure/Specifications 

   1. Select the following menu buttons on the HDS screen in sequence.

   1. PGM-FI (System Selection Menu)
   2. Function Test
   3. ALL INJECTORS STOP

   2. Attach a compression gauge to the spark plug hole.

   Tool Details 

   Name
   a	Compression gauge

   3. Step on the accelerator pedal to open the throttle fully, then crank the engine with the starter motor, and measure the compression.

   Specifications (Compression Pressure) 

   Position	Service Limit
   Each Cylinder	Above 930 kPa (9.48 kgf/cm2 , 134.8 psi)

   4. Measure the compression on the remaining cylinders.

   Specifications (Maximum Variation) 

   Item	Service Limit
   Difference between each cylinder	Within 200 kPa (2.04 kgf/cm2 , 29.0 psi)

   Result 

   • If the measurement is not within specifications, perform a cylinder leak down test to determine the problem area. Then check the following items, and remeasure the compression:
     • Camshaft timing 
     • Damaged or worn cam lobes 
     • Damaged or worn valves and seats
     • Damaged cylinder head gasket
     • Damaged or worn piston rings - Refer to: Block and Piston Inspection ()  or Piston, Ring, Pin, and Connecting Rod Inspection () 
     • Damaged or worn piston and cylinder bore - Refer to: Block and Piston Inspection ()  or Cylinder Bore Honing () 

   After Inspection 

   1. Select PCM reset - Refer to: PCM Update ()  or PCM Reset ()  to cancel ALL INJECTORS STOP with the HDS.

   2. PCM Idle Learning