Acura TSX / Honda Accord CL. Manual - part 414

1. Warm up the engine to normal operating temperature (cooling fan comes on).  

2. Turn the ignition switch OFF.  

3. Connect the HDS to the data link connector (DLC) (see HOW TO USE THE HDS (HONDA 

DIAGNOSTIC SYSTEM) ).  

4. Select PGM-FI, select inspection, then select the ALL INJECTORS OFF function on the HDS.  

5. Remove the four ignition coils (see IGNITION COIL REMOVAL/INSTALLATION ).  

6. Remove the four spark plugs.  

7. Attach the compression gauge to the spark plug hole. 

Fig. 50: Installing Compression Gauge 

8. Open the throttle fully, then crank the engine with the starter motor and measure the compression. 

Compression Pressure: Above 930 kPa (9.5 kgf/cm

2

 , 135 psi) 

 

9. Measure the compression on the remaining cylinders. 

Maximum Variation: Within 200 kPa (2.0 kgf/cm

2

 , 28 psi) 

 

10. If the compression is not within specifications, check the following items, then remeasure the 

compression. 

 

2004 Acura TSX 

2004 ENGINES 2.4L DOHC VTEC - TSX

  

 

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Damaged or worn valves and seats  

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Damaged cylinder head gasket  

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Damaged or worn piston rings  

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Damaged or worn piston and cylinder bore  

11. Select ECM/PCM reset to stop the ALL INJECTORS OFF function on the HDS.  

12. Perform the ECM/PCM idle learn procedure (see ECM/PCM IDLE LEARN PROCEDURE ).  

VTEC ROCKER ARM TEST 

Special Tools Required:  

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Air Pressure regulator 07AAJ-PNAA100  

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VTEC air adapter 07ZAJ-PNAA100  

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VTEC air stopper 07ZAJ-PNAA200  

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Air joint adapter 07ZAJ-PNAA300  

1. Start the engine and let it run for 5 minutes, then turn OFF the ignition switch.  

2. Remove the cylinder head cover (see CYLINDER HEAD COVER REMOVAL ).  

3. Set the No. 1 piston at TDC (see step 1 on CAM CHAIN REMOVAL ).  

4. Move the secondary rocker arm (A) for No. 1 cylinder. The secondary rocker arm should move 

independently of the mid rocker arm (B). 

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If the secondary rocker arm does not move, remove the mid, primary, and secondary rocker arms as 
an assembly, and check that the pistons in the rocker arms move smoothly. If any rocker arm needs 
replacing, replace the mid, primary and secondary rocker arms as an assembly, and test.  

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If the intake primary rocker arm moves freely, go to step 5. 

 

2004 Acura TSX 

2004 ENGINES 2.4L DOHC VTEC - TSX

  

 

Fig. 51: Moving The Secondary Rocker Arm For No. 1 Cylinder 

5. Repeat step 4 on the remaining intake primary rocker arms with each piston at TDC. When all the 

primary rocker arms pass the test, go to step 6.  

6. Check that the air pressure on the shop air compressor gauge indicates over 400 kPa (4 kgf/cm

2

 , 57 psi). 

 

7. Inspect the valve clearance (see VALVE CLEARANCE ADJUSTMENT ).  

8. Remove the sealing bolt (A) from the relief hole, and install the VTEC air stopper (B). 

 

2004 Acura TSX 

2004 ENGINES 2.4L DOHC VTEC - TSX

  

 

Fig. 52: Installing The VTEC Air Stopper 

9. Remove the No. 2 and No. 3 camshaft holder bolts, and install the VTEC air adapters (C) finger-tight.  

10. Connect the air joint adapter (D), and air pressure regulator (E).  

11. Loosen the valve on the regulator, and apply the specified air pressure. 

Specified Air Pressure: 290 kPa (3.0 kgf/cm

2

 , 42 psi) 

 

12. With the specified air pressure applied, move the secondary rocker arm (A) for the No. 1 cylinder. The 

mid rocker arm (B), primary rocker arm (C), and secondary rocker arm should move together. 

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If the mid and primary rocker arms do not move together with the secondary rocker arm, remove 
the mid, primary, and secondary rocker arms as an assembly, and check that the pistons in the 
rocker arms move smoothly.  

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If any rocker arm needs replacing, replace the mid, primary, and secondary rocker arms as an 
assembly, and retest.  

NOTE:

If the synchronizing piston does not move after applying air pressure; 
move the primary or secondary rocker arm up and down manually by 
rotating the crankshaft clockwise.

 

2004 Acura TSX 

2004 ENGINES 2.4L DOHC VTEC - TSX