Solving Issues with Throttle Body Injectors Not Spraying

Throttle body injectors not spraying is an issue that can arise with fuel injected vehicles. It occurs when the injectors are blocked or otherwise unable to provide sufficient fuel for the engine. This can cause the engine to run rough, lack power and have poor fuel economy. The most common causes of throttle body injector not spraying are clogged or dirty injectors, faulty wiring or connectors, a faulty fuel pressure regulator, or a faulty throttle body itself. To diagnose and fix this issue, it is important to inspect the wiring and connectors for any signs of corrosion or damage, as well as check for proper operation of the fuel pressure regulator. If necessary, the throttle body itself should be replaced as well.


Throttle Body Injectors Not Spraying

The throttle body injector is an important component of a vehicle’s fuel delivery system. It is responsible for delivering the right amount of fuel to the engine at the right time. When it is not functioning properly, it can cause poor performance and increased emissions. To understand why your throttle body injectors are not spraying, it is important to understand how they work.

How Throttle Body Injectors Work

A throttle body injector is a device that is mounted on the air intake of an engine. It contains a series of small nozzles that spray a fine mist of fuel directly into the intake manifold. This allows for precise control over the amount of fuel that enters the engine and helps to increase efficiency and reduce emissions. The injector works by opening and closing based on input from sensors in the engine management system, such as air temperature and pressure.

Common Reasons for Failure

There are several common reasons why your throttle body injectors may not be spraying correctly. The most common cause of failure is clogged or dirty injectors, which can be caused by a variety of factors such as debris in the fuel tank or oil residue in the intake manifold. If this is the case, it will need to be cleaned or replaced with new ones.

Another common cause of failure is faulty wiring or connectors in the electrical system that controls the injector. This can be caused by corrosion due to moisture or other elements getting into the wiring harness over time. To fix this problem, you will need to inspect all wiring and connectors and replace any that are damaged or corroded.

Finally, there may be an issue with one or more sensors in your vehicle’s engine management system that controls when and how much fuel is injected into the engine. If any sensor fails, it can cause incorrect readings which will result in incorrect fuel delivery from your injectors. You will need to inspect all sensors and replace any faulty ones with new ones before you can expect your throttle body injector to start working properly again.

Diagnosing Issues with Your Injectors

The best way to diagnose issues with your throttle body injector is through a diagnostic scan tool connected to your vehicle’s computer system. This will allow you to view live data from all sensors related to engine performance and allow you pinpoint exactly what is causing your injectors not to spray correctly so you can take appropriate action. It may also reveal other underlying issues such as faulty wiring or corroded connectors which should also be addressed if necessary before attempting any repairs on your throttle body injector itself.


If your throttle body injectors are not spraying correctly, there could be several underlying causes ranging from clogged or dirty injectors to faulty wiring or sensors in your vehicle’s engine management system which needs replacing before you can expect them to start working properly again. The best way to diagnose issues with your throttle body injector is through a diagnostic scan tool connected to your vehicle’s computer system so that you can get accurate readings from all related sensors and pinpoint exactly what needs fixing before attempting any repairs on your own

FAQ & Answers

Q: How do I identify throttle body injectors not spraying?
A: The most common signs that your throttle body injectors are not spraying correctly include a decrease in fuel efficiency, poor engine performance, and hesitation when accelerating. You can also visually inspect the injectors for any signs of damage or clogs.

Q: What are some common causes of throttle body injectors not spraying?
A: Common causes of faulty injectors include clogged fuel filters, a malfunctioning fuel pressure regulator, and a damaged fuel pump.

Q: How do I replace faulty throttle body injectors?
A: First, you need to prepare for the replacement by disconnecting the battery and draining the fuel tank. Then, you can remove the old injectors and install new ones. Make sure all connections are properly tightened before starting your vehicle.

Q: What should I do if my throttle body injectors are still not spraying after replacement?
A: If your new injectors are still not working correctly, you should first check for obstructions in the fuel lines. You may also need to test for proper voltage supply to the fuel pump.

Q: How can I maintain my throttle body injector system?
A: To keep your system functioning properly, you should regularly clean the filters and regulators and check the fuel pressure. This will help prevent clogs or other issues that could lead to faulty injector performance.

In conclusion, when it comes to throttle body injectors not spraying, it is important to ensure that the injectors are regularly cleaned and maintained in order to minimize the risk of them malfunctioning. Additionally, it is essential to diagnose the issue as soon as possible if you suspect that your injectors are not spraying, as this can lead to major engine problems over time. With regular maintenance and timely diagnosis, you can ensure that your vehicle’s throttle body injectors remain in top condition.

Author Profile

Carl Frisch
Carl Frisch
With more than 30 years in the bicycle industry, I have a strong background in bicycle retailing, sales, marketing and customer service. I have a passion for cycling and a dedication to excellence. As a manager, I worked diligently to increase my capabilities and responsibilities, managing up to eleven mechanics (at Palo Alto Bicycles) and later as a working partner in my own store.

As the shop owner of Spoke n’ Word Cycles in Socorro, NM, the success of the mission was my responsibility, which I pursued passionately since we opened in 2003 through the spring of 2011. I am adept at managing owned and loan inventory, preparing weekly & annual inventory statements, and managing staff. The role as managing partner also allowed me tremendous freedom. I used this personal freedom to become more deeply involved in my own advancement as a mechanic, to spearhead local trail building, and advocating for cycling both locally and regionally.

As a mechanic, I have several years doing neutral support, experience as a team mechanic, and experience supporting local rides, races, club events. I consistently strive to ensure that bicycles function flawlessly by foreseeing issues and working with the riders, soigners, coaches and other mechanics. Even with decades of experience as a shop mechanic and team mechanic, and continue to pursue greater involvement in this sport as a US Pro Mechanic, and UCI Pro Mechanic.

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