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.
1994 Infiniti J30FACTORY OEM SERVICE PROCEDURE
Timing Advance System
ECM controls ignition timing advance based upon sensor input signals that reflect ignition timing needs. If timing problems are experienced, inspect input signals for proper operation:
- Battery Voltage
- Closed Throttle Position Switch
- Crankshaft Position Sensor
- Engine (Coolant) Temperature
- Ignition (START) Signal
- Mass Airflow Sensor
- Park/Neutral (Inhibitor) Switch. (Signal received from transmission control unit).
- Power Steering Pressure Switch
- Throttle Position Sensor
- Vehicle Speed Sensor
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.