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.
Cold Advance Control
The cold advance control circuit is designed to advance injection pump timing about 4 degrees during cold engine operation. This circuit is activated by the ECM, through the cold advance relay, to energize the cold advance solenoid. The ECM opens the circuit when coolant temperature is above 95°F (35°C).
Below the switching point, and with ignition on, the cold advance solenoid is continuously energized without the engine running. Below the switching point and the engine running, injection pump housing pressure is decreased from 10 psi (.70 kg/cm2 ) to zero, which advances injection pump timing by about 4 degrees. As engine warms-up, the cold advance solenoid is de-energized and the injection pump housing pressure is returned to 10 psi (.70 kg/cm2 ).
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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.