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Step by Step Instructions on How to Change Fuel Injectors

Fuel injectors provide fuel to the engine. The injectors are comprised of a nozzle and a valve that help regulate the amount of fuel entering the combustion chamber. Fuel injectors are essential for peak engine performance, and can cut down on excessive fuel consumption and emissions. Changing the fuel injectors can take care of issues such as lean misfire, slow throttle response, and high hydrocarbon and carbon monoxide emissions.

Instructions

1

Relieve the pressure in the fuel system (fuel lines and fuel filter) by first locating the fuel pump fuse in the fuse box. If your vehicle does not have a fuel pump fuse, locate the relay that runs the fuel pump.

2

Start the car and pull the fuse or relay out while the engine is running. This will kill the engine quickly.

3

Dissipate the electric circuit by first disconnecting the negative cable from the battery terminal. Loosen the retaining bolt on the cable clamp with a wrench turned counterclockwise. Wait 10 to 20 minutes before proceeding.

4

Remove the entire air cleaner assembly, including the air box and intake tubing, by unscrewing the bolts and the hose clamp located at the throttle body assembly with a wrench or ratchet and socket. Once the screws and bolts are removed, pull out the entire air cleaner assembly and set it aside.

5

Locate and remove the bolts holding the injector retaining rail in place, if your vehicle is so equipped, to gain access to the injectors. To do this, disconnect the main fuel line located at the end of the rail with an open-end wrench. If there is an extra fuel line at the other end, remove it with the open-end wrench.

6

Remove the bolts on the fuel rail with a ratchet extension and socket. The fuel rail should come off with a little pressure once the bolts have been removed.

7

Unplug the fuel injector connectors by prying the spring clip loose with a flat head screwdriver. Once the spring clip is loose, pull the connector off the injectors.

8

Put on safety goggles then use a fuel injector puller to remove the fuel injectors. Slide the injector puller below the lip in the injector seat and pop the injectors out.

9

Check to see if any pieces of the old seal are stuck in the seat. Use the flat head screwdriver to remove the debris.

10

Remove the plastic caps attached to the new fuel injectors before installing them. Lubricate the O-rings with a little engine oil.

11

Install the new fuel injector. Ensure that the center line of the electrical connector is in sync with the corresponding mark on the intake manifold.

12

Reassemble the components by reconnecting and re-bolting any wiring or bolts that were removed prior to the installation of the fuel injectors. Re-attach the air cleaner assembly, fuel rail, and cable for the battery terminal.