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.
Limited Operation Strategy (LOS) Mode
The LOS mode functions during engine start, or upon failure of the ECA detected by a "safeguard" circuit in the ECA. This mode allows continued vehicle operation (with reduced performance) until repairs can be made. In this mode the actuator functions are set as follows:
- Ignition Module Timing: Minimum spark advance (10° BTDC).
- Feedback Carburetor Actuator (FBCA): Locked at last controlled position. On startup, the FBCA is driven full rich and then slightly lean.
- Exhaust Gas Recirculation (EGR): No EGR.
- Thermactor Air (TAB): By-Pass (dump) position.
- Canister Purge (CANP): Canister sealed, no purge.
- Throttle Kicker (TK): Low RPM idle.
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.