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.
Electronic Fuel Injection System
The LH-Jetronic fuel injection system consists of 3 functional sections: ECU, fuel system and sensors. ECU receives and evaluates readings from various sensors around engine. Microprocessor evaluates variations in engine running conditions, calculates correct amount of fuel to be injected, and produces corresponding signals to injectors. It also operates air control valve for constant idle speed by regulating airflow opening. See Fig 1 .
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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.