{"id":20038,"date":"2021-09-09T12:31:18","date_gmt":"2021-09-09T12:31:18","guid":{"rendered":"https:\/\/www.dubizzle.com\/blog\/cars\/?p=20038"},"modified":"2026-03-11T06:21:51","modified_gmt":"2026-03-11T06:21:51","slug":"bad-fuel-injector-symptoms","status":"publish","type":"post","link":"https:\/\/www.dubizzle.com\/blog\/cars\/bad-fuel-injector-symptoms\/","title":{"rendered":"Common Signs of Bad Fuel Injectors"},"content":{"rendered":"\n

A car engine injector is responsible for injecting fuel evenly into the combustion system in a specific amount. With frequent use, the fuel injector can get damaged and require immediate replacement to avoid expensive costs.<\/p>\n\n\n\n

Let\u2019s explore in detail the signs of bad fuel injectors.<\/p>\n\n\n\n

WHAT ARE THE SYMPTOMS OF A BAD FUEL INJECTOR?<\/strong><\/h2>\n\n\n\n
\"bad
Damaged car fuel injectors affect the performance and efficiency of the engine<\/figcaption><\/figure>\n\n\n\n

Needless to say, a bad fuel injector impacts your engine\u2019s performance on the whole. It affects the quantity and frequency of the fuel spray in the combustion system, forcing the engine to underperform. A bad fuel injector is one of the common reasons why a car starts then sputters and shuts off<\/a>. It is important to keep fuel injectors neat and clean to enjoy optimal performance throughout the day and avoid any mechanical hassle. <\/p>\n\n\n\n

Here is how to tell if the fuel injector is bad with the signs discussed as under. Make sure you address the car engine injector problems as early as possible. <\/p>\n\n\n\n

ROUGH IDLING<\/strong><\/h3>\n\n\n\n

A vehicle with a bad fuel injector is not getting the right amount of fuel to the engine at the right time. This gravely affects the round per minute (RPM) as it decreases below the standard level and causes the engine to stall when running. <\/p>\n\n\n\n

A bad fuel injector causes car engine idling<\/a> and the car might shake or vibrate when the brakes are pressed. In more severe scenarios a damaged fuel injector may cause serious issues in which your car may stall midway. <\/p>\n\n\n\n

VIBRATING ENGINE<\/strong><\/h3>\n\n\n\n

With a bad car engine injector, the cylinder of your vehicle does not receive the required fuel. When you turn the key to ignition, the cylinder might \u201chiccup\u201d to suck more fuel, resulting in a shaking or vibrating engine. This is what happens when fuel injectors go bad. <\/p>\n\n\n\n

ENGINE MISFIRES<\/strong><\/h3>\n\n\n\n

Without sufficient fuel for the combustion system supplied at the right time, the engine may cause a misfire. As a result, your vehicle will struggle to accelerate, pausing for a moment even when you press the pedal. <\/p>\n\n\n\n

CHECK ENGINE LIGHT IS ON<\/strong><\/h3>\n\n\n\n
\"check
When the check engine light is on its a sign that there is a problem with the fuel injector <\/figcaption><\/figure>\n\n\n\n

One of the most obvious signs of bad fuel injectors is when the check engine light is on. Since check engine light indicates the majority of the faults in the engine, similarly it also shows that there is a problem with the car engine injector. <\/p>\n\n\n\n

Every time the injector fails to deliver the required fuel to the engine, it affects the efficiency of the vehicle and turns the check engine light on. You can also use an OBD2 scanner to confirm it. Even after fixing the fuel injector, the light remains on, try resetting the check engine light<\/a>.<\/p>\n\n\n\n

FUEL-LIKE ODOUR FROM YOUR VEHICLE<\/strong><\/h3>\n\n\n\n

Another indication of a bad fuel injector is that you will smell a fuel-like odour from your vehicle. Besides, as a rule of thumb, whenever you smell strange odours, you must immediately get your automobile checked by a mechanic. In any case, they can mean something harmless or could be an indication of a significant problem. <\/p>\n\n\n\n

It is worthwhile to note that a fuel-like smell can be due to several reasons, including broken fuel lines or fuel injectors. Whatever the reason, in case of an unusual smell coming from the vehicle, you must get the problem fixed. <\/p>\n\n\n\n

SUDDEN SURGES TO THE RPM<\/strong><\/h3>\n\n\n\n

Most of the time, an uncleaned, clogged, or dirty fuel injector is the root of the problem. Similar to the way the engine does not perform when the fuel injector sprays too little fuel into the combustion system, introducing too much fuel can trigger the same fault. <\/p>\n\n\n\n

If the faulty fuel injector is spraying too much fuel into the cylinder, the engine experiences a surge that causes the acceleration to slow down. This is detected by the engine RPM changing noticeably under constant load instead of remaining at a steady figure, during your drive.<\/p>\n\n\n\n

LEAKING FUEL PUDDLE IN THE PARKING SPACE<\/strong><\/h3>\n\n\n\n
\"leaking<\/figure>\n\n\n\n

This happens when the fuel injector is broken and causes leakage before it administers fuel to the combustion system. Usually, the leakage is due to deterioration of the fuel injector or when the seals have broken down. The best way to detect this fault is to look around the exterior of the fuel injector for any signs of fuel leaks. <\/p>\n\n\n\n

ENGINE’S FUEL ECONOMY IS DROPPING SIGNIFICANTLY<\/strong><\/h3>\n\n\n\n

When the engine does not receive the exact amount of fuel for combustion, it demands the injector for an adequate supply. This results in poor fuel economy that the Engine Control Unit (ECU) thinks is needed for the vehicle, but actually not required. Hence, a bad car engine injector is one of the prime reasons of cars becoming less fuel-efficient<\/a>. <\/p>\n\n\n\n

FAILED EMISSION TEST<\/strong><\/h3>\n\n\n\n

If your vehicle fails the emission test, it is most probably due to bad fuel injectors. Even the broken car engine injector causes incomplete fuel to burn or leak, resulting in more emissions. <\/p>\n\n\n\n

BURNT VEHICLE’S CATALYTIC CONVERTER<\/strong><\/h3>\n\n\n\n

Lastly, the conclusive symptom of identifying a faulty fuel injector is a hazardous catalytic converter. The broken fuel injector causes the vehicle to run on rich fuel, meaning that a lot more fuel is supplied to the combustion system than the air. <\/p>\n\n\n\n

As a result, the fuel-air ratio tends to get disturbed, burning up the catalytic converter of the vehicle. It is important to know that repairing a fuel injector may cost you less than repairing a damaged catalytic converter, so watch out!<\/p>\n\n\n\n

CAN A BAD FUEL INJECTOR DAMAGE THE ENGINE?<\/strong><\/h2>\n\n\n\n
\"fuel
Fuel injectors need timely cleaning to prevent from being damaged <\/figcaption><\/figure>\n\n\n\n

We know that this is the pressing question you\u2019ve been thinking about since the beginning. Bad fuel injectors may not immediately cause engine failure, but if the problem persists, it can certainly result in one. Since the fuel injector is responsible for supplying fuel to the combustion system, you should need to repair it on priority, as it can easily damage your vehicle\u2019s engine. <\/p>\n\n\n\n

However, if your car\u2019s engine is damaged and you need to get another car immediately, then you may go for a second-hand vehicle. It becomes difficult to meet the expenses for many when such kind of damage occurs in the middle of nowhere. Hence, you may consider buying a used car for sale in the UAE<\/a>. <\/p>\n\n\n\n

Take a look at the list of used cars on dubizzle that includes: <\/p>\n\n\n\n