GM has several tech bullitens out on this car, have your dealer look them up, pay attention to this one!
Various Driveability Symptoms Due to Clogged Fuel Injectors, MIL/SES DTCs P0171, P0172, P0174, P0300, P1174, P1175 (Clean Fuel Injectors and/or Perform Injector Test With AFIT - CH-47976) TECHNICAL SERVICE BULLETIN Reference Number(s): 03-06-04-030F,  Date of Issue:  December 10, 2007 Related Ref Number(s): 03-06-04-030, 03-06-04-030A, 03-06-04-030B, 03-06-04-030C, 03-06-04- 030D, 03-06-04-030E, 03-06-04-030F ARTICLE BEGINNING CONDITION Some customers may comment on any of the following various driveability symptoms: à   Extended Crank Time à   Hard to Start à   MIL/SES Illuminated with DTCs à   Hesitation à   Lack of Power à   Surge or Chuggle à   Rough Idle à   Light or Intermittent Misfire CAUSE Due to various factors, the fuel injectors may become restricted. Extensive testing has demonstrated that fuel related issues are the cause of clogged injectors. At this point, no specific fuel, fuel constituent, or engine condition has been identified as causing the restriction. The restriction causes the engine to operate at a lean air fuel ratio. This may either trigger the MIL to illuminate or the engine to develop various driveability symptoms. CORRECTION 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 Affected Model(s): 2000-2008 GM Passenger Cars and Light Duty Trucks (Including Saturn); 2003-2008 HUMMER H2; 2006-2008 HUMMER H3; 2005-2008 Saab 9-7X; with 2.0L, 2.2L, 2.4L, 2.8L, 3.1L, 3.4L, 3.5L, 3.8L, 3.9L, 4.2L, 4.3L, 4.8L, 5.3L, 6.0L, 6.2L or 8.1L Engine (VINs X, F, D, 4, 5, T, 8, J, E, H, L, 6, K, 1, 2, R, W, S, X, V, T, M, N, U, H, Y, 8, G - RPOs LNF, L61, LN2, L43, LD9, LK5, LG8, LA1, LX5, LX9, LZ4, LZE, L52, L36, L67, L26, LZ9, LZ8, LGD, LL8, LU3, LR4, LM7, LH6, LQ9, LQ4, LS2, L76, L92, L18); and MULTEC  2 Fuel Injectors Supercedes: This bulletin is being revised to update the model year to 2008. Please discard Corporate Bulletin Number 03-06-04-030E (Section 06 - Engine/Propulsion System). 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: à   04-06-04-047G (U.S. Only) à   05-06-04-022D (Canada ONLY) INJECTOR CLEANING PROCEDURE The following tools, or their equivalent, are required: à   CH-47976 Active Fuel Injector Tester (AFIT) à   J 35800-A Fuel Injector Cleaner à   J 37287 Fuel Line Shut-off Adapter à   J 42964 Fuel Line Shut-off Adapter à   J 42873 Fuel Line Shut-off Adapter à   * One bottle of GM Upper Engine and Fuel Injector Cleaner, P/N 88861802 (in Canada, P/N 88861804) à   * 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 1- 800-GM-TOOLS (1-800-468-6657) 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  ) in SI. 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. NOTE: 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. 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).
The P0300 is your issue, it is the misfire code they found.
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Saturday, June 20th, 2009 AT 5:53 PM
