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.
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HOMESERVICE MANUALSSUBARU1987GL-10 4D WAGON, 1.8 4, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMSPFI CEC SYSTEMOPERATIONAIR/FUEL RATIO LEARNING CONTROL SYSTEM
1987 Subaru GL-10 4D Wagon, 1.8 4, Automatic
Air/Fuel Ratio Learning Control System
1987 Subaru GL-10 4D Wagon, 1.8 4, AutomaticSECTION Air/Fuel Ratio Learning Control System
By keeping track of or learning feedback control signals sent by oxygen sensor, the SPFI system is able to automatically make corrections. This system stabilizes driveability by maintaining original performance values.
CAUTION:
Never connect battery in reverse polarity because SPFI control unit will be destroyed instantly and fuel injector and other parts will be damaged in just a few minutes more. Also, DO NOT disconnect battery terminals while engine is running because a large electrical surge will be generated. This surge, may cause damage to electrical components.
RENDER: 1.0x
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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.