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, StandardFACTORY OEM SERVICE PROCEDURE
Constant Vacuum Generator
- Disconnect hose No. 33 from frequency solenoid valve B and connect vacuum gauge. Start engine and allow to run at idle. After vacuum stabilizes, reading should be 6-11 in. Hg vacuum.
- If vacuum stabilizes within range, constant vacuum generator is okay. Reconnect hose to frequency valve B. If vacuum stabilizes above or below specified range, replace constant vacuum generator.
Factory Service Tools
Use the Manual With the Right Hardware
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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.