Replacing Fuel Injectors In 2005 Toyota Sienna: Step-By-Step Guide

Fuel injectors are an important part of your car's fuel system, and knowing how to replace them is a valuable skill for any car owner. In this article, we will be discussing the steps involved in changing the fuel injectors on a 2005 Toyota Sienna. While it is a complex process that requires a good amount of knowledge, changing fuel injectors can help improve your car's performance and fuel efficiency. The average cost for this replacement is between $1,094 and $1,363, but it is important to note that this range does not include taxes and fees and may vary depending on your location. Now, let's dive into the process of changing fuel injectors on your 2005 Toyota Sienna.

Disconnect the battery

Disconnecting the battery is one of the first steps to take when changing the fuel injectors on a 2005 Toyota Sienna. This is a crucial safety precaution to take when working with fuel, as it mitigates the risk of fire.

To disconnect the battery, first locate the negative battery terminal. This will be clearly marked, typically with a '-' symbol. Next, you will need to disconnect the cable from the negative terminal. This is usually done by loosening a clamp or bolt that holds the cable in place. Be sure to use the appropriate tools and safety equipment, such as gloves and eye protection, to avoid any injury.

Once the cable is disconnected, it is important to properly insulate the terminal to prevent any accidental electrical connections. You can use electrical tape or a terminal cover for this purpose. Additionally, it is good practice to mark the cable and terminal with a warning label to indicate that they are disconnected. This will serve as a reminder to reconnect them properly once the fuel injector replacement is complete.

After disconnecting the battery, it is recommended to wait for a few minutes to allow the electrical system to discharge completely. This ensures that there is no residual power left in the system, further reducing the risk of electrical hazards during the repair process.

It is important to note that disconnecting the battery will reset some of the vehicle's computer systems and settings. For example, the clock will need to be reset, and you may need to reprogram certain personalized settings. Therefore, it is advisable to make a note of any important settings before proceeding.

Drain the coolant

To drain the coolant when changing the fuel injectors on a 2005 Toyota Sienna, follow these steps:

First, discharge the fuel system pressure. You can find more information on this process on page FU-1 of the Toyota Sienna Service Manual. Next, disconnect the cable from the negative battery terminal. Then, remove the engine under cover. Now, you can drain the engine coolant. Refer to page CO-6 of the service manual for more details on this step.

After draining the coolant, you can continue with the following steps to access and replace the fuel injectors:

• Remove the front wiper arm head cap, front wiper arm RH, and front wiper arm LH.
• Remove the cowl top ventilator louver subassembly, windshield wiper motor, and link assembly.
• Remove the No. 1 cowl top to cowl brace inner by removing the 2 bolts.
• Remove the cowl top panel sub-assembly outer front: disconnect the wire harness clamp, fuel pump resistor connector, and remove the 7 bolts.
• Remove the V-bank cover sub-assembly.
• Remove the air cleaner cap subassembly: disconnect the 3 vacuum hoses, No. 2 ventilation hose, and air cleaner hose band. Disconnect the vacuum hose (EVAP) from the air cleaner hose. Then, remove the 2 bolts and air cleaner cap subassembly.
• Remove the intake air surge tank assembly: disconnect the 2 water bypass hoses, fuel vapor feed hose assembly, throttle with the motor body assembly connector, and clamp. Disconnect the No. 1 ventilation hose, union to check valve hose, and connector. Using a 5 mm socket hexagon wrench, remove the 4 bolts, 2 nuts, and 2 bolts, and then remove the intake air surge tank and gasket.
• Disconnect the fuel tube sub-assembly: remove the No. 2 fuel pipe clamp, pinch the tube connector, and pull out the fuel pipe. Ensure that there is no dirt or debris around the connector, and clean it if necessary.
• Finally, you can remove the fuel injector assembly: disconnect the 6 fuel injector connectors, remove the 5 bolts and fuel delivery pipe subassembly, and carefully remove the 6 fuel injectors. Be careful not to drop the fuel injectors. Then, remove the 6 injector vibration insulators and O-rings from the intake manifold.

Remove wiper arms

To remove the wiper arms from a 2005 Toyota Sienna, you will first need to remove the wiper arm cap and nut. If the wiper arm is difficult to remove, you may need to apply some penetrating oil to help loosen it. You can then try operating the wipers, and when they change direction, the arm may pop loose.

If you are still having difficulty removing the wiper arm, you can try flipping up the wiper to release the tension of the wiper blade against the windshield.

For the rear wiper arm, you will need to remove the rear spoiler to fit a wiper arm puller. You can use a wiper blade puller to remove the old wiper arm, and then install the new one.

Disconnect fuel tube

To disconnect the fuel tube sub-assembly of a 2005 Toyota Sienna, you must first remove the No. 2 fuel pipe clamp. Then, pinch the tube connector and pull out the fuel pipe. Before disconnecting the connector, check that there is no dirt or other foreign objects around it, and clean it if necessary. It is important to prevent mud or dirt from entering the quick connector as this may cause the O-rings to not seal properly. Disconnect the quick connector by hand only, and do not bend, kink, or twist the nylon tubes. Protect the connector by covering it with a plastic bag. If the pipe and the connector are stuck, carefully try wiggling, pushing, or pulling on the connector to release it. Pull the connector off the pipe carefully.

Remove fuel injector assembly

To remove the fuel injector assembly of a 2005 Toyota Sienna, follow these steps:

Firstly, discharge the fuel system pressure. Next, disconnect the cable from the negative battery terminal. Then, remove the engine under cover, and drain the engine coolant.

You will then need to remove the front wiper arm head cap, followed by the front wiper arm RH and LH. After this, remove the cowl top ventilator louver subassembly, and then the windshield wiper motor and link assembly.

The next step is to remove the cowl top to cowl brace inner. To do this, remove the two bolts and the cowl top to cowl brace inner. Then, remove the cowl top panel sub-assembly outer front. To do this, remove the wire harness clamp, disconnect the fuel pump resistor connector, and then remove the seven bolts and the cowl top panel outer front.

Now, you can remove the V-bank cover sub-assembly, and then the air cleaner cap subassembly. Disconnect the three vacuum hoses, the ventilation hose and air cleaner hose band, and the vacuum hose (EVAP) from the air cleaner hose. Then, remove the two bolts and the air cleaner cap subassembly.

The next step is to remove the intake air surge tank assembly. Disconnect the two water bypass hoses from the throttle with the motor body assembly, the fuel vapour feed hose assembly, the throttle with the motor body assembly connector and clamp, the No. 1 ventilation hose, and the union to check valve hose. Disconnect the connector, and then, using a 5 mm socket hexagon wrench, remove the four bolts, two nuts, two bolts, and the intake air surge tank. Remove the gasket from the intake air surge tank.

Now, disconnect the fuel tube sub-assembly. Remove the No. 2 fuel pipe clamp, pinch the tube connector, and pull out the fuel pipe.

Finally, you can remove the fuel injector assembly. Disconnect the six fuel injector connectors, and then remove the five bolts and the fuel delivery pipe subassembly, along with the six fuel injectors. Be careful not to drop the fuel injectors when removing the fuel delivery pipe sub-assembly. Then, remove the six injector vibration insulators from the intake manifold, pull out the fuel injectors from the fuel delivery pipe sub-assembly, and remove the six O-rings from the fuel injectors.

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