Replacing Fuel Injectors In Your Classic 1983 Seville

If you're looking to replace the fuel injectors on your 1983 Cadillac Seville, you've come to the right place. This is a step-by-step guide on how to do it. First, make sure you have the necessary tools and safety equipment, including a socket set, rags, clean motor oil, and new injectors. Start by depressurizing the fuel system and disconnecting the battery. Remove any components that restrict access to the fuel rail, such as the engine shroud, air intake, and vacuum tubes. Next, disconnect the fuel rail bolt and the electronic plug from each injector. Pull the fuel rail directly away from the injectors, and remove the injectors from the engine. Check for O-rings on the injectors and replace them if necessary. Lubricate the new O-rings with motor oil and install the injectors into the engine, rocking them slightly to seat them properly. Reconnect the fuel rail, retaining bolt, and other accessories. Reconnect the battery and prime the fuel system by turning the ignition key to the start position several times. Check for fuel leaks and enjoy your restored Cadillac Seville!

Disconnect the negative battery cable

Disconnecting the negative battery cable is one of the first steps to take when replacing fuel injectors on a 1983 Seville. This is a crucial safety precaution as it helps to prevent any accidental electrical sparks which could cause a fire. Before disconnecting the battery, it is important to depressurise the fuel system. If your 1983 Seville is equipped with a fuel safety cutoff switch, you can do this by pulling the electrical plug from the switch, which will disengage the fuel pump. Then, try to start the engine—it will turn over but not start, and this will pull any fuel from the lines and depressurise them.

If your vehicle does not have a fuel safety cutoff switch, you can depressurise the line by finding the pressure check valve (usually on top of the rail) and depressing the valve. This will spray fuel, so be prepared for this. If you have a fuel pressure tester, it will come with a valve checker and hose, making the process less messy. Alternatively, you can pull a fuel line, but this will also be very messy. Make sure all fuel is mopped up and the area is completely dry before proceeding.

Now you can disconnect the negative battery cable. It is always best to disconnect the negative cable, as this will prevent any short circuits. Once the negative cable is disconnected, do not smoke or create any kind of spark near the battery, as this could be extremely dangerous.

Remove the air cleaner assembly

To remove the air cleaner assembly from a 1983 Cadillac Seville, follow these steps:

Firstly, raise the hood of the car and locate the air cleaner housing and extension. Remove the air cleaner housing and extension by unscrewing any screws or bolts holding it in place. Be sure to disconnect any hoses or clamps attached to the air cleaner assembly. Once all the fasteners have been removed, carefully lift out the air cleaner assembly. It may be helpful to have someone assist you with this step as the assembly can be bulky and awkward to handle. Set the assembly aside in a clean, safe place.

Next, you will need to detach any sensors, hoses, or electrical connectors attached to the air cleaner assembly. Be sure to label or mark these connections to ensure proper reassembly. Gently pull apart any clips or connectors and set the components aside.

Once all the connections have been detached, you should be able to fully remove the air cleaner assembly from the engine bay. Place it on a clean surface or in a secure location, away from dirt or debris, to avoid damaging the components.

At this point, you will have successfully removed the air cleaner assembly from your 1983 Cadillac Seville. You can now proceed with the next steps in the fuel injector replacement process. Remember to keep your workspace organised and take note of the location of all removed parts to facilitate easy reassembly.

Detach the electrical connector to each injector

To detach the electrical connector to each injector, you will first need to depressurise the fuel system. If your Cadillac is equipped with a fuel safety cutoff switch, pull the electrical plug from it to disengage the fuel pump. Then, try to start the engine—it will turn over but not start. This will pull any fuel from the lines and depressurise them. If you don't have a fuel safety cutoff switch, you can depressurise the line by finding the pressure check valve (usually on top of the rail) and depressing the valve. This will spray fuel, so be careful.

Next, pull any components that restrict access to the fuel rail on the engine. On a V8, you will need to do this for both sides of the engine, as the rails will be on both sides. Remove the following: the engine shroud, air intake, vacuum tubes, electrical plugs, and bolt-on engine accessories.

Now, disconnect the fuel rail bolt that secures the rail to the intake or engine. Disconnect the electronic plug from each injector by pushing the plug away from the rail. You are now ready to pull the injectors. Pull the fuel rail directly away from the tops of the injectors (they are held on with O-rings). You may need to rock the rail slightly. The rail will pop off all four injectors with a little pulling.

Remove the injector by twisting back and forth

To remove the injector by twisting it back and forth, you will first need to disconnect the negative battery cable. Then, relieve the fuel system pressure. Next, raise the hood, install fender covers, and remove the air cleaner assembly. After that, remove the fuel rail assembly. With the fuel rail inverted, detach the electrical connector to each injector by pushing in on the connector clip while pulling the connector body away from the injector. Now, spread open the clip slightly and slide the clip away from the fuel rail.

At this point, you are ready to remove the injector by twisting it back and forth. Grasp the injector head and pull it directly away from the engine, twisting it back and forth as you do so. You may find that it needs a little rocking to remove it. Once you have removed the injector, make sure that each injector has an O-ring on the bottom and top. Otherwise, check the rail or hole. The O-rings are larger than the hole in the engine, so there are no worries about it slipping inside, but occasionally they do remain in the slot.

Lubricate the new injector O-ring seals and install them

To lubricate the new injector O-ring seals and install them, follow these steps:

Firstly, lubricate the new injector O-ring seals with petroleum-based grease or clean motor oil. The O-rings should be flexible and can be either rolled onto the injectors or pressed into place. This will ensure there are no micro-tears in the O-ring, which could cause leaks.

Next, install the lubricated O-ring seals onto the injector assembly. The O-rings should be placed over the injector nozzle. Position the upper O-ring back up the washer and a new lubricated upper O-ring into the housing bore.

Then, position the injector into the throttle body, centring the nozzle into the bottom housing bore. You will need to rock the injector slightly to seat it correctly. When it is properly seated, the injector will resist attempts at removal.

Finally, install the fuel injector assembly into the fuel rail socket. The electrical connectors should be facing the engine front for injectors 1 through 4, and the engine rear for injectors 5 through 8.

Frequently asked questions