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.
1978 Honda Accord Base, Automatic TransFACTORY OEM SERVICE PROCEDURE
Ignition Timing Control - Except Civic
- Description
- Operation
- Testing
- Trouble Shooting
- Vacuum Hose At Distributor Does Not Hold Vacuum
- No Vacuum At Advance Hose At Idle
- Vacuum Appears At Idle When Engine Is At Normal Operating Temperature
- Less Than 12 In. Hg At Advance Hose At Idle
- No Vacuum At Advance Diaphragm At 3000 Rpm
- Vacuum Present At Retard Side Of Distributor With Cold Engine At Idle
- Vacuum Present At Advance Side Of Distributor With Cold Engine At Idle
- No Vacuum At Advance Side Of Distributor With Cold Engine At Idle
- No Vacuum At Retard Or Advance Side Of Distributor Diaphragm With Hot Engine At Idle
- Retard Vacuum Does Not Shut Off When Vacuum Reaches 7.5-8.7 In. Hg Of Vacuum
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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