Tech Tip: Cleaning Injectors on 1990-2006 Toyota and Scion Engines with Port Electronic Fuel Injection
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Tech Tip: Cleaning Injectors on 1990-2006 Toyota and Scion Engines with Port Electronic Fuel Injection

Due to fuel quality concerns, some Toyota and Scion


The following procedure has been developed to clean the fuel injectors.


Models Affected: All 1990-2006 Toyota and Scion models equipped with Port Electronic Fuel Injection.
1. If the fuel injector nozzles are visibly blocked or if the injectors do not pass the fuel injector volume test, complete the fuel injector power flush using the following instructions:

a. Before an injector cleaning is performed, it is recommended that the following items be cleaned with Toyota Throttle Plate Cleaner (P/N 00289 – 1TP00):

• Idle air control device;
• Throttle plate (both sides if possible); and
• Throttle body.

b. Bring the engine to operating temperature.

c. Disconnect the fuel pump electrical connector.

d. Start the engine. After the engine has stalled, turn off the ignition switch.

e. Disable the fuel return line by blocking the line or installing the appropriate plug in the return outlet, if applicable.

Note: Do not clamp the plastic lines.  

f. Install the device adapter to the fuel line and then secure the swivel fitting on the end of the hose.

g. Make sure the ball valve on the device is turned off (valve handle is crosswise to device). Screw the can of EFI cleaner (P/N 00289-1PF14) onto the device can adapter.


h. Open the valve on the device, start the vehicle and allow it to run until the engine stalls.  

i. Turn off the ball valve and remove the empty can.

j. Place a shop towel over the can adapter and slowly open the ball valve to depressurize the ­system.

k. Remove the supply and return line adapters, ­reconnect the vehicle’s fuel supply and return lines (replacing any fuel line gaskets and seals), and connect the fuel pump electrical connector.

l. Before starting the vehicle, pressurize the fuel system and check for leaks. Run the engine for 4-5 minutes, and then snap the throttle several times to dislodge any carbon that may remain in the system.


2. Add one can of Toyota Non-Pressurized Fuel ­Injector Cleaner – Fuel Tank Additive (P/N 08813 – 0080DS) to the fuel tank.

3. Road-test the vehicle to verify normal operation.

Source: The Automotive Parts Remanufacturers Association (APRA) provided some or all of this information. For more information on APRA technical bulletins, call 703-968-2772 or visit

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