Why does the car shake violently after replacing the fuel injectors?
1 Answers
After replacing the fuel injectors, the car shakes violently because the throttle body is too dirty. Dirty throttle body and excessive carbon buildup in fuel injectors: When a car has been driven for a certain mileage, a dirty throttle body can cause the throttle valve to not close properly or the idle stepper motor to get stuck, both of which can lead to excessively high engine idle speed. Additionally, carbon deposits generated during engine operation can also cause vehicle shaking, especially when starting the car. The engine may shake more violently than usual, and in some cases, it might not start on the first attempt. Therefore, when the vehicle experiences shaking, the throttle body and fuel injectors should be checked first. If the throttle body is found to be too dirty or the fuel injectors have excessive carbon buildup, they should be cleaned promptly. Steps for cleaning the throttle body: If there is a plastic heat shield cover on the engine, remove it. Disconnect the air ducts around the throttle body and note their positions. The side of the throttle body near the combustion chamber is usually dirty, with black carbon deposits, which is the main area to be cleaned. Cleaning the throttle body primarily involves removing carbon deposits, using specialized cleaning solutions or carburetor cleaners. These cleaning agents can be harmful to humans, so gloves and a mask should be worn during cleaning.
