A proper start for Fuel Injector cleaning involves first loosening the fuel fill cap to reduce Fuel Tank vapor pressure. Begin by removing the positive crankcase ventilation (PCV) clean air tube from the air inlet duct after which you should detach the resonator along with the air inlet duct from the
Throttle Body. Detach both the Brake Booster Vacuum Hose with its connector at the
Intake Manifold and then unplug the electrical connector on the central sequential fuel injection (CSFI) fuel metering body. At the Distributor Cap remove
Spark Plug Wires from cylinders 1, 3 and 5. Then take out the fuel line bolt at the rear side of the Intake Manifold. You must drain all pressure from the fuel system first before you can take out the fuel pipes from the metering body by unfastening the fuel pipe nuts and clamp from their position. Push the j 44466-12 and j 44466-13 into the metering body before tightening the process while validating the correct fuel pipe arrangement of o-rings, washers, and spacers. Proceed by installing the j 44466-11 followed by clamping and tight installation of the j 44466-13 onto the fuel pipe. Use the j 41413 to shut down tank valve pressure before taking out the regulator assembly. Install the j 44466-10 onto the j 41413 tank body. Connect the j 44466-10 hose to the j 44466-12 while installing the metering body components including the j 39021, j 39021-210 and j 39021-301 to the electrical connector. Adjust the amperage switch on the j 39021 to 0.5 amps. Open the valves on the tank and the j 44466-10 to achieve fuel system pressurization which should maintain at least 150 psi. You should use the j 39021 to open one injector and monitor the gauge pressure which demonstrates proper injector functionality before proceeding to other injectors. Confirm all the injectors operate correctly before stopping the j 41413 tank pressure valve and bleeding pressure off at j 44466-10. Install the fresh air tube of pcv before removing the j 44466-10 from its connections to the j 44466-12 and j 41413. Remove the j 39021-301 and j 39021-210 and j 39021 from the metering body. The procedure now involves connecting the vehicle electrical connector followed by installing the Brake Booster Vacuum Hose and ignition wires before attaching the resonator and air intake duct. Begin by operating the j 38500-a while making sure to close its bottom valve then fill the canister with gm p/n 1050002 top engine cleaner (Canadian P/N 992872) followed by regular unleaded gasoline. After which suspend j 38500-a under the hood. Thread the hose from j 38500-a to the service port of j 44466-12 and proceed by opening the j 38500-a bottom valve and linking a shop air source while setting its regulator to 75 psi. Once the canister empties out at stall time stop shop air. Detach the j 44466-12 hose and remove pcv air tube followed by resonator and wires before bleeding j 44466-12. Begin the procedures by taking out j 44466-13 and j 44466-12 from the metering body then remove j 44466-13 , clamp , and j 44466-11 from the fuel pipe. Reinstall the fuel pipe to the metering body while placing all o-rings washers and spacers properly in position followed by nut and clamp installation at 3 n.m (27 lb ft). Treat the fuel pipe bolt threads with thread lock gm p/n 12345382 (Canadian P/N 10953489) then place and rotate the bolt to 6 n.m (53 lb ft). Reposition first the Brake Booster Vacuum Hose and then the resonator followed by the air inlet duct before installing the pcv clean air tube and ignition wires. A dose of 1 ounce of port Fuel Injector cleaner gm p/n 12345104 (Canadian P/N 12345515) must be added to each gallon of gasoline in the Fuel Tank but the customer should finish the rest of the bottle during the next fill-up. Start the engine while keeping the Fuel Tank filler cap hand-tightened for leak checking. Scribers should use a tech ii scan tool to inspect powertrain dtc codes that have been stored and decide whether to advocate a new fuel brand to their customer.