How To Fix Your Secondary Injection Pump & Diagnosing Symptoms Of A Bad System

Bad Secondary Air Pump Symptoms?: A blog that discusses the symptoms and possible fixes for a bad secondary air injection pump.

Many drivers are unaware that their vehicle even has one. In this article we discuss what a secondary injection pump is and when you may need to replace one.

What Does A Secondary Injection Pump Do?

The secondary injection pump can be found in most diesel models from Volkswagen and Audi. Its sole purpose is to provide extra fuel when it’s needed most. This usually means when you step on the gas pedal for an extra boost of power or speed.

The secondary pump is connected directly to the accelerator pedal assembly inside the car and is controlled by an electric motor. The pump itself is located on or near the engine block, making it susceptible to high temperatures under hood.

As a result, excessive heat buildup can cause mechanical failure requiring replacement (more on this later).

Bad Secondary Air Pump Symptoms

A failing secondary air injection pump is often accompanied by a host of additional symptoms, many of which vary significantly in severity. Those who recognize these symptoms are often able to quickly diagnose the issue at hand, thereby restoring their vehicle to proper operating condition in short order.

While some of the most common symptoms associated with a faulty secondary air injection pump include:

Check Engine Light

A Check Engine light may appear on your dashboard if there are any problems with your air injection pumps. This light will typically begin blinking when there is a serious issue with the pumps, at which point you should immediately seek professional assistance. If you do not have the issue resolved quickly, it could cause severe damage to your engine and catalytic converter, which could be costly to repair.

Excessive Fuel Consumption

When one or both of your secondary air injection pumps fail, they will continue to consume fuel even as they are no longer providing assistance for burning fuel in the exhaust system. This means that instead of delivering added power to your engine’s performance, these air pumps will simply continue using gas without return any benefit whatsoever.

There are a number of different symptoms that can help you diagnose a failing secondary air injection pump. These symptoms include, but are not limited to:

  • Check engine light illumination
  • Increased levels of emissions
  • Rough idling
  • Misfiring
  • Decreased fuel economy and engine performance

When the vehicle is started up cold, it may sputter or stall. When the engine is warm, it may have difficulty starting.

What Is a Secondary Injection Pump?

The secondary injection pump is installed on diesel-powered vehicles only because it’s simply not needed on gasoline-powered vehicles. It’s main function is to facilitate the burning of hydrocarbons (unburned fuel) in the exhaust system so that they exit out the tailpipe in much cleaner form. It also helps reduce “black smoke” emissions while aiding in catalytic converter efficiency and increasing overall engine performance and longevity. In layman’s terms, it makes your diesel engine run cleaner, better and longer while reducing pollution output.

How the Secondary Injection Pump Works

The secondary injection pump operates in conjunction with the main fuel injector system. In some cases, the secondary injection pump is integrated into the main fuel injector system, which helps keep its cost lower than an independent design. Fuel is supplied by the main fuel injectors and delivered at a very high pressure (upwards of 20,000 psi) to a heating element located inside each cylinder head

Car Mechanic

The best way to avoid car breakdowns is to give your car for periodic service and checks. Follow the car service and maintenance schedule suggested by the manufacturer. If you have bought a used car, then ask the seller about the maintenance history of the car. Follow for more...

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