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.
BOSCH LH-JETRONIC - Engine Control System: Description
The Volvo Computerized Engine Control system is used on both Volvo 4-cylinder and 6-cylinder engines. It consists of a computer controlled electronic ignition with microprocessor and LH-Jetronic 2.2 fuel system integrated with a Constant Idle Speed system.
The computer controlled ignition system consists of a distributor, Electronic Control Unit (ECU), ignition coil, ignition switch, throttle switch, knock sensor, coolant temperature sensor and air mass meter.
LH-Jetronic fuel system consists of Electronic Control Unit (ECU), air mass meter, injectors, injector ballast resistors, coolant temperature sensor, air control valve, lambda sond, fuel pump and in-tank pump.
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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.