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.
1990 Honda Civic SiFACTORY OEM SERVICE PROCEDURE
Idle Speed & Ignition Timing
Ensure idle speed and ignition timing are set to specification. For adjustment procedures, see ADJUSTMENTS article.
IDLE SPEED SPECIFICATIONS (1)
| Application | RPM | ||||
|---|---|---|---|---|---|
| Civic | 675-775 | ||||
| Fast Idle | 1,000-2,000 | ||||
| CRX | |||||
| HF | |||||
| California | 600-700 | ||||
| Federal | 550-650 | ||||
| Si | 700-800 | ||||
| Standard (Base Model) | 675-775 | ||||
| Fast Idle | 1,000-2,000 | ||||
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IGNITION TIMING (Degrees BTDC @ RPM)
| Application | Setting | |||
|---|---|---|---|---|
| Civic | 16-20 @ 700-800 | |||
| CRX | ||||
| Standard | 16-20 @ 675-775 | |||
| Si | 16-20 @ 700-800 | |||
| HF (1) | 12-16 @ 550-650 | |||
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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.