Corvette V8-6.2L (2008)
Fuel injector restrictions, deposits can be cleaned on the vehicle using the following procedure. Under NO circumstances should this procedure be
modified, changed or shortened. As a long term solution, and to prevent reoccurrence, customers should be encouraged to use Top Tier Detergent
Gasoline. For further information on Top Tier detergent gasoline and fuel retailers, please refer to the following Corporate Bulletin Numbers:
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04-06-04-047G (U.S. Only)
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05-06-04-022D (Canada ONLY)
Notice
GM UPPER ENGINE AND FUEL INJECTOR CLEANER is the only injector cleaning agent approved for use with General Motors fuel system
components. Other injector cleaners may cause damage to plastics, plated metals or bearings. General Motors has completed extensive laboratory testing
of GM Upper Engine and Fuel Injector Cleaner, and can assure its compatibility with General Motors fuel system components, as long as the cleaning
procedure is followed correctly.
Injector Cleaning Procedure
The following tools, or their equivalent, are required:
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CH-47976 Active Fuel Injector Tester (AFIT)
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J 35800-A Fuel Injector Cleaner
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J 37287 Fuel Line Shut-off Adapter
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J 42964 Fuel Line Shut-off Adapter
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J 42873 Fuel Line Shut-off Adapter
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* One bottle of GM Upper Engine and Fuel Injector Cleaner, P/N 88861802 (in Canada, P/N 88861804)
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* One bottle of GM Fuel System Treatment Plus, P/N 88861011 (in Canada, P/N 88861012)
Active Fuel Injector Tester (AFIT- CH-47976)
Some dealers may not have an Active Fuel Injector Tester (AFIT- CH-47976). Dealers can contact to order an AFIT- CH-47976. Dealers still can test
the fuel injectors without an AFIT. Refer to Fuel Injector Diagnosis (w/ J 39021 or Tech 2(R)) in SI.
Important
As mentioned in the AFIT User Guide, vehicles that are not listed in the AFIT menu can still be tested with the AFIT. Depending on the model, it may be
possible to enter the previous model year and proceed with testing using the DLC connection. If this is not possible on the model that you are working
on, it will be necessary to use the direct connection method outlined in the AFIT User Guide (See Pages 17-31).
General Motors recommends that the Active Fuel Injector Tester (AFIT) be used in testing fuel injectors. If the SI diagnostics do not isolate a cause for
this concern, use the Active Fuel Injector Tester (AFIT - CH-47976) to perform an "Injector Test" as outlined in the AFIT User Guide.
The AFIT "Injector Test" measures the flow characteristics of all fuel injectors, which is more precise when compared with the standard Tech 2(R) fuel
injector balance test. As a result, the AFIT is more likely to isolate the cause of a P1174 DTC (for example: if it is being caused by a fuel injector
concern).
The CH-47976 (Active Fuel Injector Tester - AFIT) can also be used to measure fuel pressure and fuel system leak down. Also, as mentioned in the
P1174 SI diagnosis, if the misfire current counters or misfire graph indicate any misfires, it may be an indicator of the cylinder that is causing the
concern. Refer to Fuel Injector Diagnosis (w/CH-47976) in SI for additional instructions.
Training (U.S.)
To access the training video on AFIT, take the following path at the GM Training Website:
1. After logging into the training website, choose the link on the left side of the page titled "web video library."
2. Then choose "technical."
3. Next, within the search box, type in September course number "10206.09D.
4. This will bring up a link with this course. Scroll through to choose "feature topic."
5. At this point, the seminar can be chosen to view or the video related to the AFIT.
Additional training is available from the training website. Please see TECHassist 16044.18T2 Active Fuel Injector Tester and also see 16044.14D1 GM
Powertrain Performance for more information on GM Upper Engine and Fuel Injector Cleaner.
