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.
Fuel Injection System - BOSCH LH: Description: Injectors
The injectors are located in the intake manifold and point directly at the intake valve. All injectors are supplied with fuel from a common fuel manifold. The injection pulse is controlled by a needle valve assembly in the bottom of the injector. The needle valve is operated by an electric solenoid which is switched on and off by the electronic control unit. All fuel injectors inject fuel at the same time.
Use the Manual With the Right Hardware
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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.