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Makes 🢒 GMC_Truck 🢒 2007 🢒 Yukon - 4WD 🢒 Bulletins 🢒 EI07239 - 5.3L, LMG, LC9 Driveability Concern, Hesitation , DTC, Check Engine Light, Misfire, Fuel Injector

EI07239 - 5.3L, LMG, LC9 Driveability Concern, Hesitation , DTC, Check Engine Light, Misfire, Fuel Injector

Subject:EI07239 - 5.3L, LMG, LC9 Driveability Concern, Hesitation, DTC, Check Engine Light, Misfire, Fuel Injector

Models:2007-2008 Cadillac Escalade, Escalade ESV, Escalade EXT
2007-2008 Chevrolet Silverado, Suburban, Tahoe
2007-2008 GMC Sierra, Yukon, Yukon Denali, Yukon XL
with 5.3L Engine (VINs 0, 3 -- RPOs LMG, LC9)

Attention: Proceed with this bulletin ONLY if the customer has commented about this concern AND the EI number is listed in GMVIS. If the customer has not commented about this condition or the EI does not show in GMVIS, disregard the bulletin and proceed with diagnostics found in published Service Information. THIS IS NOT A RECALL -- refer to Service Bulletin 04-00-89-053A for more detail on the use of Engineering Information bulletins.

Condition

Important:  If the customer did not comment on a driveability concern, disregard this bulletin.

Some customers may comment about a driveability concern. This condition may set a check engine light.

Cause

GM Engineering is attempting to determine the need for performing the fuel injector cleaning procedure on the 5.3L LMG and LC9 engines. GM has a need to obtain information first hand from the technician during diagnosis and BEFORE repair. As a result, this information will be used by engineering to "root cause" the customer's concern and validate a field fix.

If diagnosis leads to a repair other than fuel injectors, disregard this bulletin. If diagnosis leads the technician to the fuel injector, complete the following steps noting all information on the repair order.

DO NOT MAKE ANY REPAIRS PRIOR TO CONTACTING THE ENGINEER.

  1. Describe the customer's concern - be specific.
  2. Verify the vehicle mileage.
  3. Check for DTCs - note whether the DTC is current or stored in history.
  4. Can the customer's concern be duplicated?
  5. Using the Tech 2®, record the following information:

    6. Refer to Fuel Trim Data thru the Tech 2®:

    • Engine Coolant Temperature (ECT) reading:
    • Fuel alcohol content:
    • Fuel trim cell:

    Object Number: 2004731 Size: SH

    Misfire Data thru the Tech 2®:

    • Injector disable due to misfire?
    •  

    Object Number: 2004734 Size: SH
  6. Using the CH-47976 - Active Fuel Injector Test, perform the injector test. Document the following results on the repair order:
    7. • What is the percent average flow of each injector?
    • What is the injector flow rate for each injector?
  7. Contact the following engineer and provide all information noted on the repair order. The engineer will provide the technician with repair information.

    8. If the engineer does not answer, leave a message containing the following information. If the engineer does not return the call within one hour, proceed with repairs based on diagnosis.

    • Technician Name
    • Dealer Name
    • Dealer Code
    • Dealer Phone Number
    • VIN and Repair Order Number

Engineer

Phone #

Tim Braman

248-640-8472

Warranty Information
    • For repairs not related to the fuel injector, use the appropriate labor operation from the LTG.
    • For repairs related to the fuel injector in which the engineer was contacted, use the labor operation provided in this bulletin.

Labor Operation

Description

Labor Time

J7807*

Fuel Injector -- Engineering Information

0.7 hr

Add

To Replace Injectors

0.9 hr

*This labor operation number is for bulletin use only. This number will not be published in the Labor Time Guide.