Replacing Fuel Injectors: 1991 Integra Guide

If you're experiencing problems with your 1991 Integra, you may need to replace the fuel injectors. A faulty or clogged fuel injector can cause a number of issues, including reduced engine performance, difficulty in acceleration, a strong gasoline smell, and reduced fuel efficiency. While it is possible to replace the fuel injectors yourself, it is a complicated process and it may be best to consult a professional mechanic. The cost of replacing fuel injectors can vary depending on the make and model of your vehicle, but generally, you can expect to pay between $800 and $1500 for parts and labour.

Remove the metal clip

To remove the metal clip that holds the fuel injector in place, you will first need to relieve the fuel system pressure. This can be done by disconnecting the fuel line (hose) and the fuel rail. Make sure the engine is cold before you begin this process.

Next, disconnect any plugs that are connected to a wiring harness. Using pliers, carefully detach the electrical connector on each injector. This will ensure that the fuel injector is no longer connected to the engine's electrical system.

Now, you can begin to remove the fuel injector itself. To do this, you will need to lift the fuel rail off the intake manifold. It is recommended to use fuel injector pullers to avoid accidentally damaging the injectors during this process.

Once the fuel rail is lifted, gently pull the injector in a back and forth motion to disconnect it from the fuel rail. Be cautious, as the O-rings inside the injectors are very delicate and can easily be damaged.

At this point, the metal clip should be exposed and can be removed. Use a pair of needle-nose pliers or a similar tool to carefully grip the metal clip and pull it away from the injector. Ensure that you do not drop it into the engine bay, as finding small metal objects can be difficult.

With the metal clip removed, you can now proceed to install the new fuel injector. Remember to always refer to a qualified mechanic if you are unsure about any part of this process.

Disconnect the battery

Disconnecting the battery is an important step when performing any maintenance on your car. This is because the battery provides power to the vehicle's electrical systems, including the fuel injectors. Disconnecting the battery will prevent any power surges or short circuits that could damage the vehicle's electrical systems or cause injury.

To disconnect the battery, first locate the battery in the engine bay of your 1991 Integra. The battery is typically located near the front of the engine bay, on the driver's side. Once you have located the battery, you will need to disconnect the negative terminal, which is usually identified by a black cable and a "-" symbol. Use a wrench or socket to loosen the nut that secures the cable to the battery terminal. Be careful not to let the wrench touch any other metal parts of the car, as this could cause a short circuit.

After the negative terminal is disconnected, carefully move the cable away from the battery. You may need to tie it back or secure it in a safe position to ensure it does not accidentally come into contact with the battery terminal. With the battery disconnected, you can now safely work on the fuel injectors without risk of electrical shock or short circuit.

It is important to note that disconnecting the battery will cause the vehicle's computer to lose its memory. This means that you may need to reprogram certain settings, such as the radio presets or clock, once the battery is reconnected. Additionally, some modern vehicles may require a special procedure to reset the computer after the battery has been disconnected. Always refer to the vehicle's service manual or consult a qualified mechanic if you are unsure about any procedures.

Remove the wire harness

To remove the wire harness from your 1991 Integra, start by making sure the engine is cold. Then, disconnect the battery.

Next, remove any plugs that are connected to a wiring harness. Using pliers, disconnect the electrical connector on each injector. The wire harness is held in place by two nuts on the studs. Take these off to remove the wire harness.

Once the wire harness is off, you can move on to removing the fuel injectors.

Remove the fuel rail

To remove the fuel rail of a 1991 Integra, start by relieving the fuel system pressure. This is done by disconnecting the fuel line (hose) and the fuel rail. Ensure the engine is cold to the touch before you begin, and disconnect the battery.

Next, remove any plugs that are connected to a wiring harness. Using pliers, disconnect the electrical connector on each injector. You will need to lift the fuel rail off the intake manifold to remove the injector. It is recommended to use fuel injector pullers to avoid damaging the injectors.

Gently pull the injector back and forth to disconnect it from the fuel rail. Be very careful, as the O-rings are delicate and can be easily damaged. There are also little filters inside the injectors, so be sure to take note of their position so you can put them back correctly when installing the new injector.

Remove the injector, replace seals

To remove the injector, replace seals and change the fuel injectors on a 1991 Integra, follow these steps:

Firstly, relieve the fuel pressure. This can be done by releasing the fuel cap, loosening the nut on the fuel filter, or removing the fuel pump fuse and cranking the engine a few times. Disconnect the battery as an additional safety measure.

Next, remove the fuel rail by unbolting it. There should be two or three bolts holding it in place. Once the fuel rail is removed, carefully take out the desired injector. Be cautious when handling the injector's o-rings, as they are delicate and can be damaged easily.

Now, you can replace the seals. Lubricate the o-ring of the new injector and press it into the fuel rail. Ensure that the little filters inside the injectors are correctly positioned.

Finally, place the fuel rail back onto the studs and tighten the nuts. Reattach the wire harness and tighten the nuts.

The process of changing the fuel injectors on a 1991 Integra is now complete. Ensure you test-drive the vehicle to ensure everything is functioning correctly.

Note: It is recommended to refer to the vehicle's repair manual or seek professional assistance if you are unsure about any steps or procedures.

Frequently asked questions