Question 1

How to clean the fuel injector on Chevrolet Colorado?

Accepted Answer

The required tools for Fuel Injector cleaning consist of fuel line shut-off adapters (J 37287), Fuel Injector cleaner (J 38500-A), 3/8 fuel line shut-off valve (J 42873-1), 5/16 return pipe shut-off valve (J 42873-2), 3/8 fuel pipe shut-off valve (J 42964-1) and 5/16 fuel pipe shut-off valve (J 42964-2). Use gm top-engine cleaner p/n 12346535 in the us but canadian dealers should use p/n 992872 while respecting a cleaning solution concentration up to 10 percent. Start your procedure by acquiring two tanks containing the Fuel Injector cleaner product designated j 38500-a and verify that the bottom valve of the canister remains sealed. The j 38500-a requires two pre-stacked gm top-engine cleaner containers for us dealers but canadian dealers should measure then fill with 48 ml of top-engine cleaner. The mixture requires 96 ml top-engine cleaner blended with 864 ml regular unleaded gasoline for alternative brand use. Regular unleaded gasoline must be put into the cleaning tank of the tool using all instructions included with the tool. The vehicle Fuel Pump needs disabling and specific shut-off valves should secure the fuel feed and return line where it meets the Fuel Rail. Use the j 38500-a to connect with the vehicle Fuel Rail before applying 510 kpa (75 psi) pressure. The j 38500-a should be unconnected once the engine stops idling before you return the Fuel Pump relay and oil pressure switch connector back into place. After disconnecting the shut-off valves proceed to reconnect the fuel lines and let the vehicle start for 2 more minutes with an idle. Run a second injector balance test to measure fuel pressure drops from all injectors before you change any unit which shows more than 15 kpa (2 psi) decline. One ounce of port Fuel Injector cleaner, gm p/n 12345104 (Canadian P/N 10953467), should be added to the fuel tank for each gallon of gasoline while providing instructions to the customer for fuel brand changes and gm port Fuel Injector cleaner use as maintenance for every 5000 km (3,000 mi). Then conduct a road test to confirm the customer concern is solved.

Question 2

How to replace a fuel injector on Chevrolet Malibu?

Accepted Answer

The first step when replacing fuel injectors requires draining the fuel system pressure. You should start by removing the Fuel Rail then unclipping the retaining clips before taking out the fuel injectors from the rail. You must detach both Fuel Injector O-Ring components starting with the upper segment followed by the lower segment. The process of new injector installation requires proper flow rate calibration for each component while selecting the appropriate part number. Position the Fuel Injector upper o-ring along with the lower o-ring while carefully placing the brown o-ring at the bottom followed by using an o-ring back up for correct o-ring positioning on the Fuel Injector. Install the Fuel Injector onto the Fuel Rail after which the retaining clips must be used to secure it. Fasten the Fuel Rail back into place before closing the fuel filler cap securely. Check for fuel leaks by turning on the ignition for two seconds followed by waiting ten seconds with the ignition off then recheck for any fluid drippage upon turning on the ignition.

Question 3

How to service and repair the fuel injector on Chevrolet S10?

Accepted Answer

A vehicle operator should start service or repair work on fuel injectors by unscrewing the fuel filler cap so vapor pressure in the Fuel Tank decreases. The pcv clean air tube should be detached from the air inlet duct before removing the resonator and air inlet duct from the Throttle Body. Disconnect the central sequential fuel injection (CSFI) fuel metering body electrical connector while you detach the Brake Booster Vacuum Hose along with its connector from the Intake Manifold. Disconnect Spark Plug Wires from Distributor Cap cylinders 1, 3, and 5 while removing the Intake Manifold fuel line bolt at its rear position. The technician should first depressurize the fuel system before unthreading the nuts and clamp from the fuel pipe while checking the correct placement of the fuel pipe o-rings and washers and spacers. Begin installing the j 44466-12 and j 44466-13 to the metering body before tightening the hardware, then move onto hooking up the j 44466-11 and clamp followed by the j 44466-13 to the fuel pipe connection point. Place the j 41413 instrument on the tank valve to close it while discarding the regulator assembly and installing the j 44466-10 hose to the j 41413 tank. Ensure the metering body electrical connector receives connections from the j 39021, j 39021-210, and j 39021-301 while using the j 39021 amperage selector switch to set an output of 0.5 amps. Turn on the valves at the tank and j 44466-10 to build up fuel system pressure before maintaining at least 150 psi minimum pressure. Check that each injector operates properly by using the j 39021 as you observe the pressure drops. Stop the pressure flow at the j 41413 tank through its pressure valve and release all pressure at the j 44466-10. Install the pcv fresh air tube while disconnecting the j 44466-10 from j 44466-12 and j 41413 and removing j 39021-301, j 39021-210, j 39021 from the metering body. Proceed with connecting the electrical connector first followed by attaching the Brake Booster Vacuum Hose before reconnecting ignition wires. Secure the resonator and air intake duct before obtaining the j 38500-a which requires closure of the canister valve at its bottom. Place top engine cleaner gm p/n 12346535 into the canister before filling it with regular unleaded gasoline then suspend the j 38500-a. Insert the hose from j 38500-a into the service port of j 44466-12. Open the bottom valve of j 38500-a and establish shop air delivery at 75 psi. Follow these steps: make the j 38500-a empty while the vehicle runs then stop shop air delivery and allow the j 38500-a pressure to decrease. Disconnect the hose from the j 44466-12 before performing another pcv clean air tube, resonator, and ignition wires removal. After bleaching j 44466-12 of residual pressure, workers must remove j 44466-13 and j 44466-12 from the metering body before installing j 44466-13 followed by the clamp and j 44466-11 onto the fuel pipe. Lock and tighten the fuel pipe to the metering body using both clamp and nuts at 3 n.m (27 lb ft). Threadlock gm p/n 12345382 must be applied to the fuel pipe bolt before tightening it to 6 n.m (53 lb ft). The service continues with installation of ignition wires after fitting the Brake Booster Vacuum Hose and the resonator and the pcv clean air tube. A proportionate amount of port Fuel Injector cleaner from gm p/n 12345515 in canada must be added to each standard gallon of gasoline present inside the Fuel Tank. Put on the Fuel Tank filler cap and start the engine then inspect for leakage at the Fuel Tank. Use a tech ii scan tool to verify that powertrain dtc codes are stored and clear them if required before ensuring the customer switches to new fuel brands.

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