Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

1992 Acura NSX StandardFACTORY OEM SERVICE PROCEDURE

VTEC Spool Valve

Disconnect the 2-pin connector from the spool valve.
Measure resistance between the Yellow (front cylinder head) or Blue/Yellow (rear cylinder head) terminal and body ground. Resistance should be approximately 14-30 ohms. See Fig 1 .

Fig 1: Testing VTEC Spool Valve Resistance
Courtesy of AMERICAN HONDA MOTOR CO., INC.
If the resistance is within specifications, remove the spool valve assembly from the cylinder head and check the spool valve filter for clogging. If there is clogging, replace the engine oil filter and engine oil. See Fig 2 .
If filters are normal, push the spool valve with your finger and check its movement. See Fig 3 . If spool valve is normal, check the engine oil pressure. With oil temperature at 176°F (80°C), oil pressure should be 10 psi (69 kPa) minimum at idle, and 50 psi (345 kPa) minimum at 3000 RPM.

Fig 2: Inspecting VTEC Spool Valve

Courtesy of AMERICAN HONDA MOTOR CO., INC.

Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.

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