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.
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HOMESERVICE MANUALSHONDA1985ACCORD SEI, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMSPARK CONTROL SYSTEMSYSTEM TESTINGEFI MODELS
1985 Honda Accord SEi, Standard
EFI Models
1985 Honda Accord SEi, StandardSECTION EFI Models
- Disconnect vacuum hose No. 2 from vacuum advance diaphragm A. Connect vacuum pump/gauge to hose. Start engine and run at idle. There should be vacuum. If there is no vacuum, check vacuum hose for leaks, blockage or disconnected hose and retest.
- Apply 20 in. Hg vacuum to advance diaphragm A. Timing should advance and remain steady. If timing does not advance, check breaker plate for freedom of movement. If breaker plate moves freely, replace vacuum advance and retest.
- Warm engine until it reaches normal operating temperature (cooling fan operates). Disconnect vacuum hose No. 5 from vacuum advance diaphragm B. Connect vacuum pump/gauge to hose. Allow engine to idle and check for vacuum.
- There should be no vacuum. If there is vacuum, check for voltage at cold advance solenoid valve. If there is voltage, replace ECU and retest. If there is no voltage, replace cold advance solenoid valve.
- Raise engine speed to 1500 RPM and check for vacuum. There should be vacuum. If there is no vacuum, check vacuum hoses for leaks, blockage or disconnected hoses. Check for voltage at cold advance solenoid valve.
- If there is voltage, replace cold advance solenoid valve and retest. If there is no voltage, replace ECU and retest.
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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.