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.
1991 Infiniti Q45 BaseFACTORY OEM SERVICE PROCEDURE
Ignition Timing
NOTE:
Q45 models use a distributorless ignition system. Firing order for Q45 models is controlled by ECU through left and right power transistors. Adjustments to timing are NOT possible.
IGNITION TIMING (Degrees BTDC @ RPM) (1)
| Application | Specification | ||||
|---|---|---|---|---|---|
| G20 | 13-17 @ 700-800 | ||||
| M30 | 13-17 @ 750-850 | ||||
| Q45 (2) | 13-17 @ 700-800 | ||||
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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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