What are the symptoms of a dirty car fuel injector?

2 Answers
DelConnor
07/24/25 12:31pm
Symptoms of a dirty car fuel injector include: increased engine noise, unresponsive throttle, uneven acceleration, and minor idle shaking. The fuel injector is located on the intake manifold of the direct-injection cylinder block. It is a simple solenoid valve that operates as follows: when the solenoid coil is energized, it generates a magnetic force that lifts the needle valve, opening the injection hole. Fuel is then sprayed at high speed through the annular gap between the needle valve head and the injection hole, forming a fine mist for optimal combustion. The cleaning method for a car fuel injector is: 1. Hang the cleaning device on the front hood of the car; 2. Locate the engine's fuel supply and return lines; 3. Disconnect the return line from the engine and use a suitable plug to block it; 4. Connect the supply line to the cleaning device's outlet line; 5. Open the fuel tank cap, remove the fuel pump fuse to stop the fuel pump, and the cleaning process is complete.
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DelPaisley
08/11/25 6:36am
After driving for many years, I often encounter dirty fuel injectors, with very obvious symptoms: the engine struggles to start when cold, requiring several turns of the key to fire up; the car shakes noticeably at idle, and you can feel the vibration even in the driver's seat; acceleration feels sluggish, with a delayed response when pressing the throttle, as if dragging through mud; fuel consumption also increases—what used to last a full week on a tank now falls short by dozens of kilometers; the most annoying part is the engine warning light occasionally coming on, only to find out after inspection that it's due to uneven fuel injection caused by clogged injectors. If not addressed promptly, it can lead to bigger issues, such as catalytic converter damage. I recommend using high-quality gasoline regularly and getting fuel injector cleaning during routine maintenance—it can save a lot on repair costs.
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