How to Remove the Fuel Injector?
2 Answers
Remove the engine cover, take off the intake pipe, and unplug the power connectors of the four fuel injectors, as well as those of the throttle and idle motor. The fuel injector assembly bracket is secured with two screws. Unscrew the left and right screws of the fuel injector assembly, then remove the assembly to take out the fuel injector. Below is some relevant information about fuel injectors: 1. Introduction to Fuel Injectors: The fuel injectors used in modern cars are essentially simple solenoid valves. When the solenoid coil is energized, it creates a magnetic force that lifts the needle valve, opening the injection port. Fuel is sprayed out at high speed through the annular gap between the needle valve head and the injection port, forming a mist that facilitates complete combustion. 2. Main Causes of Fuel Injector Jamming: Dirty diesel fuel, impurities in the high-pressure fuel line causing the needle valve assembly to not close tightly, high-pressure gas from the combustion chamber backflowing, and burning out the needle valve assembly, among others.
Removing fuel injectors requires real finesse. When I worked on my old Bora last time, I first disconnected the negative battery terminal for safety, then pulled the fuel pump fuse to depressurize the system. Used special tools to release the fuel line quick-connects, wiped clean around the ports - you don't want debris falling into the engine. The electrical connector has a tiny clip that needs gentle prying before removal. When taking out the two 10mm bracket bolts, always use a magnetic pickup tool - dropping them in the engine bay is a nightmare. Always lubricate new injector O-rings with engine oil before installation, and listen for the definitive 'click' during reassembly. The whole job takes about 30 minutes, but beginners should budget an hour - those plastic clips snap easily if you're heavy-handed.
