What are the causes of excessive fuel injection pulse width?

[JohnnyMarie]

There are two main reasons for excessive fuel injection pulse width. Caused by car idling: Excessive fuel injection pulse width is generally related to idling. If the idling speed is high and the pulse width is large, it is usually caused by inaccurate signals from the throttle position sensor or coolant temperature sensor. If the idling speed is normal, then it is due to a faulty oxygen sensor. Caused by data: Inaccurate closed-loop data received by the ECU can also lead to this issue. The primary data involved includes signals from the oxygen sensor and coolant temperature sensor, though the intake pressure sensor and throttle position sensor should not be ruled out. You can purchase a Bluetooth OBD scanner and install software to check various parameters of the vehicle, or have a professional at a testing station re-examine the data.

[RyderLynn]

I've repaired many cars and found that excessive injector pulse width is most commonly caused by faulty sensors. For example, a dirty or malfunctioning MAF sensor can mistakenly indicate insufficient air intake, prompting the ECU to command more fuel injection, naturally increasing the pulse width. Similarly, a faulty oxygen sensor providing inaccurate air-fuel mixture readings can also lead to increased pulse width as compensation. Other causes include ECU programming errors or intake system leaks, which make the engine think it needs to inject more fuel due to perceived insufficient air, resulting in skyrocketing fuel consumption and excessive emissions. My advice is to promptly check sensors and the ECU whenever you notice power loss or foul exhaust smells. Regular cleaning of the air filter can also help. Addressing these minor issues in time can save a lot of money.

[SamuelLynn]

As a car enthusiast, I believe the issue with injection pulse width is mainly caused by system misjudgment. The ECU calculates pulse width based on sensor data. Once there's significant error in MAP or MAF sensors, such as reading higher air pressure or abnormal airflow, it blindly extends the injection duration. Coupled with high fuel pressure where injectors spray faster, the pulse width becomes even harder to control. I've DIY tested before - aging oxygen sensors affect feedback signals, making the ECU mistakenly think there's insufficient oxygen and widen the pulse width for adjustment. This leads to over-rich mixture, causing spark plugs to get coated with carbon deposits, resulting in sluggish power and higher fuel consumption. Checking circuits and updating software is crucial - never overlook these details.

[KhloeFitz]

Having driven for decades, excessively large fuel injection pulse width is usually the result of minor issues accumulating. For instance, loose or damp wiring of sensors like the MAP can cause signal chaos, prompting the ECU to foolishly extend the injection duration. When fuel injectors are clogged, the pulse width must also be increased to maintain normal flow. Additionally, older cars may experience ECU bugs, leading to miscalculations and excessive fuel injection. The symptoms are obvious: sluggish acceleration, black exhaust smoke, and rapid fuel gauge drops. Timely detection and part replacement can resolve the issue—don't wait until the engine seizes.

[MasonRose]

Many people neglect maintenance, leading to excessive fuel injection pulse width. I've seen owners too lazy to change the air filter, where dust blocks the intake, causing sensor misreporting and increased pulse width. ECU faults or outdated software can also make mistakes, increasing fuel injection time as compensation. Worn or leaking fuel injectors are worse—when the computer detects errors, it extends the pulse width to maintain power. The consequences include wasted fuel, excessive emissions, and potential damage to the catalytic converter. Prevention is simple: check sensor cleanliness quarterly and perform regular ECU diagnostics.

[MacFelix]

Previously, my car experienced excessive fuel injection pulse width due to various reasons. Sensors like the oxygen sensor were covered in oil, causing signal delays and prompting the ECU to increase the pulse width for more fuel injection. The fuel pump pressure was unstable, causing the injectors to open and close rapidly, thus lengthening the pulse width. External factors such as low atmospheric pressure at high altitudes led to miscalculations by the computer, resulting in pulse width expansion. This issue caused the engine to emit black smoke, significantly increased fuel consumption, and made driving difficult. Timely scanning of fault codes with diagnostic tools, cleaning sensors, or updating the ECU can resolve the problem.