PI1296
Service Bulletin Details
Public Details for: PI1296
This preliminary bulletin provides additional diagnoses for engine misfires, popping noise after cylinder head or fuel rail repair.
- 2015 - 2014 - 2013 - 2012 - 2011 - 2010 - 2009 - 2008 -
Models from 2015
Models from 2014
Models from 2013
Models from 2012
Models from 2011
| 2011 BUICK ENCLAVE |
| 2011 BUICK LACROSSE |
| 2011 CADILLAC CTS |
| 2011 CADILLAC SRX |
| 2011 CADILLAC STS |
| 2011 CHEVROLET CAMARO |
| 2011 CHEVROLET EQUINOX |
| 2011 CHEVROLET TRAVERSE |
| 2011 GMC ACADIA |
| 2011 GMC TERRAIN |
Models from 2010
Models from 2009
| 2009 BUICK ENCLAVE |
| 2009 BUICK LACROSSE |
| 2009 CADILLAC CTS |
| 2009 CADILLAC SRX |
| 2009 CADILLAC STS |
| 2009 CHEVROLET TRAVERSE |
| 2009 GMC ACADIA |
| 2009 SATURN OUTLOOK |
Models from 2008
| 2008 CADILLAC STS |
File in Section: Service Bulletin Bulletin No.: Date: PI1296 August, 2014 PRELIMINARY INFORMATION Subject: Diagnostic Tip for Engine Misfire and/or Popping Noise on Cold Startup after Cylinder Head or Fuel Rail/Injector Repair Models: 2009-2015 Buick Enclave Models 2010-2015 Buick LaCrosse, Allure (Canada) 2008-2011 Cadillac STS 2009-2015 Cadillac CTS Models 2010-2015 Cadillac SRX 2013-2015 Cadillac ATS, XTS 2009-2015 Chevrolet Traverse 2010-2015 Chevrolet Camaro, Equinox 2012-2015 Chevrolet Captiva, Impala 2015 Chevrolet Colorado 2009-2015 GMC Acadia Models 2010-2015 GMC Terrain 2015 GMC Canyon 2009-2010 Saturn OUTLOOK Equipped with HFV6 Engine RPOs LF1, LFW, LFX, LLT, LF3 or LFR Condition/Concern Some customers may comment on a engine misfire and/or popping noise within the first few minutes of a cold start after a recent cylinder head and/or fuel rail/injector repair has been performed. This may be caused by improper orientation of the fuel injectors due to the previous repair. The injector spray pattern is not in a circular shape, but an oval shape. An improperly installed injector redirects the ends of the oval spray pattern into the intake valve during valve overlap in the split pulse mode of a cold start. Once the split pulse injection start up process has completed it’s duty cycle, the engine will operate normally until the next cold start event. Service Information (SI) will be updated with greater detail on orientation of the fuel injectors and wiring harness in the future. Recommendation/Instructions Verify the orientation of the fuel injectors. Refer to Fuel Injector Fuel Rail Assembly Replacement in SI. 3967942 3967940 • Bank 1 injector connectors aim toward the rear of the engine as shown above. 3967941 • Bank 2 injector connectors aim toward the front of the engine as shown above.