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

Idle Speed

IDLE SPEED SPECIFICATIONS ⁽¹⁾

Application

RPM

G20 ⁽²⁾ & M30

750-850

Q45

600-700

⁽¹⁾	Transmission in Neutral, with no load on engine. Idle speed is controlled by computer. No adjustment is necessary unless components are replaced.

⁽²⁾	800-900 with A/C on.

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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