GM 12580426
Injector

Start by taking out the Fuel Rail before you can discard the Fuel Injector retainer clip and remove the Fuel Injector. Discard both the Fuel Injector retainer clip and follow it with the removal of Fuel Injector O-Ring seals (2, 4). New fuel injectors must be selected correctly because each unit carries a part identifier stamp along with a four-digit production code that shows manufacturing data for month, day, year, and manufacturing shift. Clean engine oil should be used to lubricate new injector o-ring seals (2, 4) before installation onto the Fuel Injector. Use a new retainer clip on the Fuel Injector before inserting the Fuel Injector through the Fuel Rail injector socket so the electrical connector faces outward and the retainer clip locks onto the flange on the Fuel Rail injector socket. Finally, reinstall the Fuel Rail.

The required tools for Fuel Injector service and repair include j 38500-a (Fuel Injector Cleaner) paired with j 37287 (Fuel Line Shut-Off Adapters for cars and trucks not listed) as well as j 42964-1 (3/8 Fuel Line Shut-Off Adapter for S/T Trucks and G Van), j 42964-2 (5/16 Fuel Line Shut-Off Adapter for S/T Trucks and G Van) and j 42873-1 (3/8 Fuel Line Shut-Off Adapter for C/K Trucks) and j 42873-2 (5/16 Fuel Line Shut GM Top Engine Cleaner must be the only solution used without fuel tank addition to protect the pump and components from breakdown. Use the J 38500-A while maintaining the cleaning solution at a maximum concentration of 10% by combining 960 ml (32.4 oz) for complete dispense. The j 38500-a requires two empty gm top-engine cleaner containers (P/N 12346535) for U.S. Dealers and canadian dealers should combine 48 ml (1.62 oz) of top-engine cleaner (P/N 992872). To substitute with different top-engine cleaner mix 96 ml (3.24 oz) of selected solution with 864 ml (29.16 oz) of unleaded gasoline. Several steps follow the addition of gasoline to the cleaning tank including disabling the Fuel Pump and disconnecting both fuel feed and return lines to plug them with appropriate shut-off adapters. The j 38500-a should be connected to the Fuel Rail and operated at 510 kpa (75 psi) of pressure until the engine stalls. Reconnect the Fuel Pump relay to its source and lines before allowing the vehicle engine to idle for another two minutes. Perform the injector balance test to check injector pressure drops but replace any injector with more than 15 kpa (2 psi) drop. Apply port Fuel Injector cleaner (P/N 12345104 or Canadian P/N 10953467) equal to one ounce per tank gallon of gasoline then instruct customers to switch fuel brands use gm port Fuel Injector cleaner every 3000 miles before conducting a vehicle test check.

Begin Fuel Injector replacement by removing the Fuel Rail yet maintaining carefulness to avoid damaging both the Fuel Injector electrical connector pins along with nozzles thereafter avoid exposing the Fuel Injector to any cleaning substances due to its electrical nature. You should check for fuel leaks because contaminated engine oil could occur from failing fuel injectors. Undertake Fuel Injector retaining clip removal followed by extractor of the Fuel Injector from the Fuel Rail while discarding both injector o-ring seals (2, 4) located at its ends. The correct Fuel Injector should be chosen for installation since it carries a part number and a four-digit manufacturing date code displaying month and day of production and its manufacturing shift. Clean engine oil should be applied to new injector o-ring seals (2, 4) before installation to the injector which will be followed by a new retaining clip placement. The Fuel Rail installation ends with pushing the Fuel Injector into position through the Fuel Rail. Set its electrical connector outside while ensuring the retaining clip finds the flange on the Fuel Rail injector socket to complete reinstallation.

There are several components needed for Fuel Injector cleaning including j 37287 (Fuel Line Shut-Off Adapters), j 35800-a (Fuel Injector Cleaner), j 42873-1 (3/8 Fuel Line Shut-Off Valve), j 42873-2 (5/16 Return Pipe Shut-Off Valve), j 42964-1 (3/8 Fuel Pipe Shut-Off Valve), and j 42964-2 (5/16 Fuel Pipe Shut-Off Valve). The recommended gm top-engine cleaner must be your only choice since using other agents with methanol or injecting the cleaner into the fuel tank can damage the Fuel Pump. A 10 percent solution concentration should be followed for the cleaning mixture since higher concentrations might damage the fuel system components. When a vehicle accumulates less than 160 km (100 mi) of odometer reading the injectors should be replaced rather than undergoing cleaning. The required amount of cleaning solution reaches 960 ml (32.4 oz) and corresponds to filling up two tanks in the j 35800-a. Us dealers should add two 24 ml (0.812 oz) gm top-engine cleaner cans with gm p/n 12346535 into the j 35800-a. Close the bottom valve while performing this step. The j 35800-a needs canadian dealers to set the top-engine cleaner (Canadian P/N 992872) at 48 ml (1.62 oz). The combination of 96 ml (3.24 oz) top-engine cleaner solution requires 864 ml (29.16 oz) regular unleaded gasoline in any non-gm brand. The cleaning tank of the injector tool requires regular unleaded gasoline according to manufacturer instructions. To disable the Fuel Pump start by removing the Fuel Pump relay and then disconnect the oil pressure switch connector when present. The j 37287, j 42964-1, j 42964-2, j 42873-1, and j 42873-2 should be used to plug the fuel feed and return line at the Fuel Rail based on applicability. The technician must attach the j 35800-a to the vehicle Fuel Rail before increasing its pressure to 510 kpa (75 psi). Proceed with starting the engine at idle until it cuts off because of fuel depletion takes approximately 15-20 minutes. After disconnecting the j 35800-a from the Fuel Rail the technician should reinstall both the Fuel Pump relay and oil pressure switch connector followed by removing the plugging items to reconnect the fuel feed and return lines. Allow the vehicle to start and idle for another two minutes to clear away remaining injector cleaner that still remains in the Fuel Rail and lines. Execute the repeated procedures of steps 1 through 5 during the injector balance test while documenting the pressure drops observed in each device. The replacement of the injector with the lowest drop becomes necessary only when the difference between highest and lowest fuel pressure drop exceeds 15 kpa (2 psi). The service technician should introduce one ounce of port Fuel Injector cleaner that corresponds to the gasoline amount (GM P/N 12345104 or Canadian P/N 10953467) into the fuel tank but request the customer to complete the bottle consumption before the next fuel refill. The customer needs to switch to a different fuel brand while using gm port Fuel Injector cleaner at every 5000 km (3,000 mi) interval to sustain injector cleanliness and prevent recurring cleaning operations. Drive the vehicle on the road to ensure the customer concern has been successfully addressed.

After becoming aware of fuel-contaminated engine oil from leaking fuel injectors you must take out the fuel meter body. Before removing the fuel injectors always disrupt their electrical connector terminals. Start by removing the lock nuts which hold the retainer system in place. These electrical components require complete assembly servicing only because any liquid solvent or cleaner can harm them so cleaning is not advised. A small tip punch combined with pulling downward motion will free the injector by creating space between its terminals. Always obtain the precise fuel injector which corresponds to the target application when you need replacements. Clean engine oil should serve as lubrication for NEW injector O-ring seals before installing the fuel injector into the fuel meter body injector socket. The next step includes installation of the injector retainer followed by the injector retainer lock nuts at 3 N.m (27 lb in); finish the procedure by reinserting the fuel meter body.

The required tools to clean fuel injectors include Fuel Line Shut-Off Adapters (J 37287) and Fuel Injector Cleaner (J 38500-A) along with 3/8 Fuel Line Shut-Off Adapter (J 42873-1), 5/16 Fuel Line Shut-Off Adapter (J 42873-2) and 3/8 Fuel Line Shut-Off Adapter (J 42964-1) and 5/16 Fuel Line Shut-Off Adapter (J 42964-2). Use GM Top-Engine Cleaner with GM P/N 12346535 (US dealers) or Canadian P/N 992872 (Canadian dealers) exclusively as the recommended cleaning agent only if the concentration remains below 10 percent and no solution should be added to the fuel tank. Two tanks of J 38500-A Fuel Injector Cleaner should be obtained before each is filled with 960 ml (32.4 oz) of cleaning solution. To begin the procedure you must remove power from the fuel pump and disconnect fuel lines to proceed with plugging them using required shut-off adapters. Use the Fuel Injector Cleaner (J 38500-A) injector to connect with the fuel rail while maintaining 510 kPa (75 psi) pressure before letting the engine run until stall occurs. The procedure ends with reconnecting the fuel lines and a further engine operation for another two minutes. Measure injector balance through fuel pressure drops before changing any devices showing drops exceeding 15 kPa (2 psi). To preserve injector cleanliness the customer should regularly add one ounce of Port Fuel Injector Cleaner (GM P/N 12345104 or Canadian P/N 10953467) to each fuel tank gallon of gasoline. Driving the vehicle on the road helps verify the repair has fixed the problem.

Service and repair of the Fuel Injector starts by removing the Fuel Rail assembly together with the injector retainer clip before extracting the injector from the Fuel Rail pod. Keep the retainer clip and both injector o-ring seals (2, 4) for disposal. Caution must be exercised while working with the Fuel Injector electrical connector pins and nozzles because immersing the unit in any cleaner will risk damaging this electrical component. The presence of leaking fuel injectors leads to contamination of the engine oil. It is essential to select the correct Fuel Injector when making a replacement since the assembly bears identification markings that combine the part number with a 4-digit code showing the production month, day and year and manufacturing shift. The new injector o-ring seals (2, 4) need cleaning oil application before inserting into position with engine oil and then receiving a fresh retaining clip. The procedure ends with insertion of the Fuel Injector into the Fuel Rail pod while orienting the electrical connector towards the outside. The retainer clip should be positioned on a flange of the Fuel Rail injector socket before reinstalling the Fuel Rail assembly.

The Fuel Rail needs removal before extracting both the Fuel Injector retainer clip and Fuel Injector from their installation position. The vehicle must receive two disposal procedures applying to both the Fuel Injector retainer clip and Fuel Injector O-Ring seals (2, 4). New fuel injectors should be ordered according to the application since the Fuel Injector carries identification part numbers and four-digit production codes which display production month, day, year and manufacturing shift. Apply clean engine oil to the new injector ring seals (2, 4) before you install them onto the Fuel Injector. You must secure a retainer clip to the Fuel Injector before inserting the Fuel Injector into the Fuel Rail injector socket with the outside facing direction while the clip needs to engage at the flange on the socket. Finally, reinstall the Fuel Rail.

Service of fuel injectors begins with removing the Fuel Rail which releases the Fuel Injector retainer clip and finally extracting the Fuel Injector. Toss away both the Fuel Injector retainer clip together with the Fuel Injector O-Ring seals (2, 4). Always obtain fuel injectors that match the specific application requirements before new installation. The fuel injectors display two markings: a part number id together with a four-digit code which declares manufacturing month, day, year and shift. The new Fuel Injector O-Ring seals (2, 4) need engine oil lubrication before being installed onto the Fuel Injector. A new retainer clip should be placed onto the Fuel Injector before inserting the Fuel Injector into the Fuel Rail injector socket with its electrical connector facing outward. The retainer clip should attach to a flange which exists on the Fuel Rail injector socket. Finally, reinstall the Fuel Rail.

The items required to clean fuel injectors are 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). Top-engine cleaner gm p/n 12346535 from us dealers and canadian p/n 992872 from canadian dealers should be used with the canister valve maintained in the closed position. Other brand top-engine cleaners should be mixed with 3.24 oz (96 ml) of regular unleaded gasoline for the proper solution. Connect shut-off adapters to the applicable fuel lines before the vehicle gets disconnected from its Fuel Pump and the feed and return lines get separated for plugging. Use the Fuel Injector cleaner as a connection to the Fuel Rail before applying 510 kpa (75 psi) pressure for running the engine until stalling occurs. The following operation requires reconnecting the fuel lines and running the engine for two consecutive minutes. Conduct the injector balance test to check fuel pressure drops then replace the injector showing the lowest pressure drop if needed. For optimal performance of fuel injectors the customer should add one ounce of port Fuel Injector cleaner gm p/n 12345104 or canadian p/n 10953467 to the fuel tank before every gallon of gasoline and regularly change fuel brands and add cleaner to maintain injector efficiency. Testing the vehicle on the road will validate the resolution of the reported problem.

You should remove the fuel meter body ahead of replacing the fuel injector but remember the engine oil will contain fuel if fuel injectors leak. You must remove the injector retainer lock nuts followed by the retainer. To remove the fuel injector pull it downward while inserting a small tip punch that should press between the terminals until the injector frees without damaging the electrical connector terminals. Due to the electrical nature of these fuel injectors they should be handled as complete assemblies only because submerging them in any kind of cleaning solution can harm them too much for cleaning to be advisable. It is essential to pick the specific fuel injector that matches the application when placing a new order. The NEW injector O-ring seals require clean engine oil lubrication before putting the fuel injector into the fuel meter body injector socket. Proceed with installation of the injector retainer and its lock nuts and tighten them to 3 N.m (27 lb in) before reattaching the fuel meter body.

After becoming aware of fuel-contaminated engine oil from leaking fuel injectors you must take out the fuel meter body. Before removing the fuel injectors always disrupt their electrical connector terminals. Start by removing the lock nuts which hold the retainer system in place. These electrical components require complete assembly servicing only because any liquid solvent or cleaner can harm them so cleaning is not advised. A small tip punch combined with pulling downward motion will free the injector by creating space between its terminals. Always obtain the precise fuel injector which corresponds to the target application when you need replacements. Clean engine oil should serve as lubrication for NEW injector O-ring seals before installing the fuel injector into the fuel meter body injector socket. The next step includes installation of the injector retainer followed by the injector retainer lock nuts at 3 N.m (27 lb in); finish the procedure by reinserting the fuel meter body.

First prepare your work by removing the air cleaner outlet duct followed by draining fuel system pressure with ch 48027. You need to start by taking off the engine wiring harness bracket nut followed by removing electrical connectors from the evap purge solenoid , generator , map sensor , ignition coil main electrical connector , and the fuel injectors (3 and 7). When disconnecting these connectors you should mark them for correct reassembly. Start by removing the negative battery cable stud together with terminal from the right Cylinder Head followed by disassembly of the engine wiring harness clips and positive crankcase ventilation (PCV) hose. Begin by detaching the Fuel Rail bolts followed by removing the retainer that shields the evap canister purge solenoid to the Fuel Rail and disconnecting both the chassis fuel feed pipe and evap tube quick connect fittings. Withdraw the Fuel Rail assembly after checking that the electrical connections are undamaged while throwing away the existing o-ring seals which damped the fuel injectors at positions 2 and 4. Clean engine oil should be used to lubricate new o-ring seals before placing them on the injectors which will then be installed into the Fuel Rail under retainers . Set the Fuel Rail in position onto the Intake Manifold with force until it achieves complete seating and then install and tighten the Fuel Rail bolts to 10 n.m (89 lb in). The service technician should install evap tube and purge solenoid and chassis fuel feed pipe and pcv hose connections in sequence. After properly positioning the engine wiring harness install its clips before connecting the negative battery cable terminal and stud by tightening the stud to 25 n.m (18 lb ft). Secure the electrical connectors to the ignition coil along with electronic throttle control along with fuel injectors while confirming that cpa retainers are properly placed. The last installation step involves securing the engine wiring harness bracket nut to 5 n.m (44 lb in) while also performing the specified turnover of the ignition and leak checks before reinstalling the air cleaner outlet duct.

You need to begin by removing the Fuel Rail yet maintain all Fuel Injector electrical connector pins along with nozzles and keep the Fuel Injector dry from any cleaning solutions which could harm its electrical element. Watch for oil contamination by fuel because the fuel injectors have a leaking issue. The first step consists of removing both halves of the Fuel Injector retaining clip followed by extraction of the injector from the Fuel Rail while discarding the injector o-ring seals (2, 4) at the ends. Prior to replacement use the build date code stamped on the injector to order correct parts because the date code shows both the month of manufacturing and the factory production shift and day along with year. Place a new retaining clip onto the Fuel Injector after applying clean engine oil to the new o-ring seals (2, 4) and installing them to their positions. Push the Fuel Injector into the Fuel Rail with the electrical connector facing outwards so the retaining clip can lock onto a flange of the rail injector socket before reinstalling the Fuel Rail.

Suspend the J 38500-A and connect the hose from it to the service port on the J 44466-12, then open the valve at the bottom of J 38500-A and connect a shop air source, adjusting the regulator to 75 psi.

Ensure to order the correct injector for the application.

Install the O-ring seals onto the fuel injector.

Lubricate the NEW injector O-ring seals with clean engine oil.

Connect the Fuel Injector Cleaner (J 35800-A) to the fuel rail, pressurize it to 510 kPa (75 psi), and run the engine until it stalls.