GM 12586684
Injector

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.

Proper tools required for Fuel Injector cleanup consist of fuel line shut-off adapters (J 37287), Fuel Injector cleaner (J 35800-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). Before adding top-engine cleaner gm p/n 12346535 in the us or gm p/n 992872 in canada dealers must close the canister valve. The combination for cleaning requires 3.24 oz of top-engine cleaner poured into 29.16 oz of regular unleaded gasoline when different brand solutions are used. To initiate the procedure disconnect the fuel return lines and fuel feed lines before plugging them properly while disabling the vehicle Fuel Pump. Attach the cleaning tank to the Fuel Rail before adding pressure to 510 kpa (75 psi) and let the engine run until it stops. Reconnect the fuel lines to the vehicle then operate it for 2 minutes before ending the process. You should conduct the injector balance test by measuring the fuel pressure reduction of each injector followed by an injector exchange in case the lowest pressure drop is detected. For preventive measures share the port Fuel Injector cleaner gm p/n 12345104 (Canadian P/N 10953467) and explain its dosage of one ounce per gallon of fuel and recommend frequent use of the cleaner to avoid future complications during fuel tank refills. Testing the vehicle on the road will verify if the repair successfully dealt with the concern.

The replacement process requires care to prevent damage to electrical connector pins or nozzles because direct contact with any cleaning solution can result in injector damage. Motor vehicles should be serviced to avoid Fuel Injector leakage that can pollute engine lubrication. Start the replacement process by taking out the Fuel Rail assembly followed by the Fuel Injector harness connector removal. Start by removing the Fuel Injector retainer clip and afterward pull the injector from the Fuel Rail after discarding the retainer clip. Discard both o-ring seals present at the ends of the injector unit. Selecting the correct part number during injector purchasing is essential since each unit has part number markings together with a four-digit manufacturing date code showing both monthly and daily and yearly production details. The installation requires applying gm p/n 9981704 light lubrication to new o-ring seals before installing them onto the new injector. The injector installation requires a new retainer clip that should be attached to the injector before inserting the injector into the Fuel Rail socket while orienting the electrical connector outside. The retainer clip should secure onto the socket's flange. Reassemble the vehicle by connecting the Fuel Injector harness connector then reinstall the Fuel Rail assembly.

First, remove the fuel rail assembly and disconnect the fuel injector harness connector from the fuel injector.