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.
1992 Infiniti Q45 BaseFACTORY OEM SERVICE PROCEDURE
4-Cylinder Ignition Timing: G20
- Start engine, and warm it to normal operating temperature (needle is in middle of coolant gauge). Operate engine for 2 minutes at 2000 RPM. Perform self-diagnostic procedure, and check for smooth engine operation. See G - TESTS W/ CODES article in the ENGINE PERFORMANCE Section.
- Turn engine off. Disconnect throttle position sensor connector, and restart engine. Increase engine speed to 2000 RPM, 2 or 3 times, and then allow engine to return to idle.
- Connect timing light to cylinder No. 1 spark plug cable. Check ignition timing. See IGNITION TIMING table. If necessary, adjust timing by loosening distributor mounting bolts and turning distributor. With ignition timing correctly set, check idle speed and mixture. See IDLE SPEED & MIXTURE. Reconnect throttle position sensor connector.
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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