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
EGR Control Solenoid Valve
- Open the control box lid and disconnect the wire harness from control box. Disconnect lower vacuum hose of EGR control solenoid valve (between the EGR control solenoid valve and the air chamber), from the air chamber. Apply vacuum to the hose. If it does not hold vacuum, go to next step. If it does hold vacuum, replace the EGR control solenoid valve and re-test.
- Connect the positive terminal of a 12 volt battery to the Black/Yellow terminal of the control box connector and the negative terminal to the Red terminal. Apply vacuum to the hose. If it does not hold vacuum, replace the EGR control solenoid valve and re-test.
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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