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 MANUALSMAZDA1991929 BASEREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCEENGINE CONTROLS - ADJUSTMENTSIGNITION TIMINGRX7
1991 Mazda 929 Base
Ignition Timing: RX7
1991 Mazda 929 BaseSECTION RX7
NOTE:
Before adjusting ignition timing, warm engine to normal operating temperature. Turn off all accessories. Place transmission in Neutral (M/T) or Park (A/T). Ensure idle speed is correct. See IDLE SPEED under IDLE SPEED & MIXTURE.
- Connect a jumper wire between ground and Green test connector near battery. See Fig 1 . Connect timing light to leading spark plug wire (bottom wire) of front rotor housing.
- If Yellow mark on pulley aligns with indicator pin, go to next step. See Fig 2 . See IGNITION TIMING SPECIFICATIONS - RX7 TABLE . If Yellow mark does not align with indicator pin, loosen Crank Angle Sensor (CAS) lock bolt. Rotate CAS until timing marks are aligned. Tighten lock bolt.
- Connect timing light to trailing spark plug wire (top wire) of front rotor housing. If Red mark on pulley does not align with indicator pin, loosen CAS lock bolt. Rotate CAS until timing marks are aligned. Tighten lock bolt.
CAUTION:
On RX7, ignition timing is set AFTER top dead center.
IGNITION TIMING SPECIFICATIONS
| Application | Leading (Yellow) | Trailing (Red) | ||
|---|---|---|---|---|
| RX7 (1) | 5 @ 750 | 20 @ 750 | ||
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RENDER: 1.0x
NO RELATED
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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.