Yukon/Denali 2WD V8-6.0L VIN U (2004)
Fuel Injector: Service and Repair
Fuel Injector Cleaning Procedure
FUEL INJECTOR CLEANING PROCEDURE
TOOLS REQUIRED
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J 37287 Fuel Line Shut-Off Adapters
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J 38500-A Fuel Injector Cleaner
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J 42873-1 3/8 Fuel Line Shut-Off Adapter
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J 42873-2 5/16 Fuel Line Shut-Off Adapter
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J 42964-1 3/8 Fuel Pipe Shut-Off Valve
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J 42964-2 5/16 Fuel Pipe Shut-Off Valve
IMPORTANT:
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GM Top-Engine Cleaner is the only injector cleaning agent recommended. Do not use other cleaning agents, as they may contain methanol which
can damage fuel system components.
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Under NO circumstances should the top engine cleaner be added to the vehicles fuel tank, as it may damage the fuel pump and other system
components.
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Do not exceed a 10 percent cleaning solution concentration. Higher concentrations may damage fuel system components. Testing has
demonstrated that exceeding the 10 percent cleaning solution concentration does not improve the effectiveness of this procedure.
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During this procedure you will need a total of 960 ml (32.4 oz) of cleaning solution. That is 2 tanks of solution for the J 38500-A. Other brands of
tools may have a different capacity and would therefore require more or less tanks to complete the procedure. You must use all 960 ml (32.4 oz) of
solution to insure complete injector cleaning.
1. Obtain J 38500-A (2).
IMPORTANT: Make sure the valve at the bottom of the canister (3) is closed.
2. For US dealers, empty 2 pre-measured GM Top-Engine Cleaner containers, 24 ml (0.812 oz) each, GM P/N 12346535, into the J 38500-A.
3. For Canadian dealers, measure and dispense 48 ml (1.62 oz) of Top-Engine Cleaner, Canadian P/N 992872, into the J 38500-A.
4. If you are using any other brand of tank you will need a total of 96 ml (3.24 oz) of Top-Engine Cleaner mixed with 864 ml (29.16 oz) of regular
unleaded gasoline.
5. Fill the injector cleaning tank with regular unleaded gasoline. Be sure to follow all additional instructions provided with the tool.
6. Electrically disable the vehicle fuel pump by removing the fuel pump relay and disconnecting the oil pressure switch connector, if equipped.
7. Disconnect the fuel feed and return line (if equipped) at the fuel rail. Plug the fuel feed and return line (if equipped) coming off the fuel rail with J
37287 , or J 42964-1 , and J 42964-2 , or J 42873-1 and J 42873-2 as appropriate for the fuel system.
8. Connect the J 38500-A to the vehicle's fuel rail.
9. Pressurize the J 38500-A to 510 kPa (75 psi).
10. Start and idle the engine until it stalls, due to lack of fuel. This should take approximately 15-20 minutes.
11. Disconnect J 38500-A from the fuel rail.
12. Reconnect the vehicle's fuel pump relay and oil pressure switch connector, if equipped.
