What Causes Injector Circuit Open?
3 Answers
Injector circuit open is caused by rail pressure sensor and related faults. Injector leakage: No response when starting may also be due to injector issues such as leakage or excessive carbon buildup, resulting in an overly lean air-fuel mixture during startup and difficulty in ignition. Additionally, when the charcoal canister or its solenoid valve malfunctions, it can also lead to starting difficulties. Engine carbon deposits: This non-starting phenomenon may primarily be caused by excessive carbon buildup in the idle speed control valve, intake passages, intake valves, and combustion chambers. Due to excessive carbon deposits and dirt in the intake passages, the cross-sectional area of the air passages changes, leading to an overly rich or lean air-fuel mixture, causing abnormal combustion or engine shaking after startup, or even complete failure to start.
Last time my car's fuel injector suddenly short-circuited, and I was so anxious that I broke out in a sweat. The main issue could be that the wires were worn and touching the ground, especially those lines in the engine bay near high-temperature components; or the connector was clogged with oil sludge, leading to poor contact, just like when a phone's charging port gets dusty and won't charge. Those who've modified the circuit need to be extra careful—poorly wrapped wiring can easily cause a short circuit. Also, if the connector's clip is broken or loose, a few bumps can cut the power, which was exactly the problem with my car. If you really can't find the issue, check the fuse box—a blown 15A mini fuse can also cut the fuel supply. Don't try to fix this yourself; it's best to go to a repair shop and use a multimeter to test the resistance.
I've disassembled fuel injector circuits for research: open circuits fundamentally occur due to interruptions in the power supply path. Focus on three key areas—blown fuses are the most common, especially when loose battery terminals cause sudden voltage changes; wiring harnesses gnawed by rodents or with melted insulation from high heat can cause short circuits when wires touch; oxidized or rusted connectors are the most concealed issue—last time I cleaned out half a spoonful of rust. There's also a less-known scenario: aftermarket HID lights stealing power from the ECU can interfere with fuel injection signals. If you notice sudden cylinder misfires, don't force the engine to run—non-functioning fuel injectors can flood the cylinders with gasoline, potentially damaging the engine.
