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Subject: Supplement to Upper Engine and Fuel Injector Cleaner Label Models: All GM Vehicles Equipped with a Gasoline Engine

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Subject: Supplement to Upper Engine and Fuel Injector Cleaner Label Models: All GM Vehicles Equipped with a Gasoline Engine 7/11/2018 #PIP4753: Supplement To Upper Engine And Fuel Injector Cleaner Label - (Dec 11, 2009) • 2003 GMC Truck Yukon 4WD • MotoLogic 2003 Yukon 4WD Report a problem with this article Subject: Supplement to Upper Engine and Fuel Injector Cleaner Label All GM Vehicles Models: Equipped with a Gasoline Engine The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI. Condition/Concern: Some service procedures, service bulletins, or PIs may advise to decarbon the engine with GM Upper Engine and Fuel Injector Cleaner to remove valve deposits but the label that is on the back of the bottle does not include any instructions that explain how to use the cleaner. Recommendation/Instructions: If a service procedure, service bulletin, or PI does not include decarboning instructions and the GM Vehicle Care 3 Step Induction Cleaning Kit (E-957-001) is not available, the guidelines below supplement the label and explain how the cleaner can be used to clean the intake valves: Important: Extreme care must be taken not to hydrolock the engine when inducing the cleaner. If too much cleaner is induced at too low of a RPM, or if you force the engine to stall by inducing too much cleaner at once, the engine may hydrolock and bend a connecting rod(s). 1. In a well-ventillated area with the engine at operating temperature, slowly/carefully induce a bottle of GM Upper Engine and Fuel Injection Cleaner into the engine with RPM off of idle enough to prevent it from stalling (typically around 2,000 RPM or so). Depending on the engine configuration, induce the cleaner through the throttle body or an engine vacuum hose/pipe. 2. Turn the engine off after inducing the cleaner and allow the cleaner to soak with the engine off for 1 hour (Do not let cleaner soak for more than 2 hours as remaining deposits may start to harden back up again). https://www.motologic.com/car/cbf04354-174b-102b-8293-001b2106f1f9/article/8444ffee5e5d7410609e95a6df396588?returnPath=%2Fcar%2Fcbf043… 1/2 7/11/2018 #PIP4753: Supplement To Upper Engine And Fuel Injector Cleaner Label - (Dec 11, 2009) • 2003 GMC Truck Yukon 4WD • MotoLogic 3. Add a bottle of GM Fuel System Treatment Plus to the fuel tank and fill the vehicle with one of the Top Tier gasolines listed in the latest version of 04-06-04-047. See Bulletin 05-00-89-078 for more details on GM Fuel System Treatment Plus. 4. Test drive the vehicle extensively to circulate the GM Fuel System Treatment Plus, which will help to eliminate/reduce any remaining intake valve deposits. 5. Advise the customer to only use one of the Top Tier Gasolines listed in the latest version of 04- 06-04-047 to minimize intake valve deposits in the future. Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed. GM bulletins are intended for use by professional technicians, NOT a "do-it- yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the WE SUPPORT proper service of a vehicle. Properly trained technicians have the equipment, VOLUNTARY tools, safety instructions, and know-how to do a job properly and safely. If a TECHNICIAN condition is described, DO NOT assume that the bulletin applies to your CERTIFICATION vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information. https://www.motologic.com/car/cbf04354-174b-102b-8293-001b2106f1f9/article/8444ffee5e5d7410609e95a6df396588?returnPath=%2Fcar%2Fcbf043… 2/2.
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