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
Spark Plugs
SPARK PLUG TYPE
| Application | NGK | |
|---|---|---|
| G20 | ||
| Except Platinum-tipped | BKR6E | |
| Platinum-tipped | PFR6B-11 | |
| M30 & Q45 | PFR6B-11 | |
SPARK PLUG SPECIFICATIONS
| Application | Gap - In. (mm) | Torque - Ft. Lbs. (N.m) | |
|---|---|---|---|
| G20 | |||
| Except Platinum-tipped | 031-.035 (0.8-0.9) | 14-22 (20-29) | |
| Platinum-tipped | .039-.043 (1.0-1.1) | 14-22 (20-29) | |
| M30 & Q45 | |||
| Platinum-tipped | .039-.043 (1.0-1.1) | 14-22 (20-29) | |
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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