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.
1987 Honda Prelude Base, AutomaticFACTORY OEM SERVICE PROCEDURE
Air Control Valve A
- Disconnect vacuum hose No. 16 (Accord), 29 (Civic) or 15 (Prelude) from air control valve A. Connect vacuum pump and disconnect air hose between air control valve A and frequency solenoid valve A. Connect hand vacuum pump and pressure gauge to hose. See Fig 2 .
- When vacuum is applied to vacuum hose side, air should flow without resistance and pressure gauge should not indicate any pressure. When vacuum is released, air should flow with resistance and pressure should build-up on gauge and release gradually. If air control valve fails either test, valve should be replaced.
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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