Subject: | Intermittent Extended Crank During Hot Soak Restart |
Models: | 2007-2008 Cadillac Escalade |
2007-2008 Chevrolet Avalanche, Silverado, Suburban, Tahoe |
2007-2008 GMC Sierra, Yukon |
with 5.3L E85 Engine (RPO LC9 or LMG) |
This PI was superseded to update Recommendation/Instructions. Please discard PIP4450A.
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Some customers may complain of an intermittent extended crank when restarting their engine after a hot soak (typically 30-60 minutes). This may be the result of a fuel injector or fuel pump concern. Typically, no DTCs will be stored upon inspection and if this is related to a fuel injector concern, the technician may notice that the engine starts quicker if they press the accelerator pedal.
If this complaint is encountered, perform the Hard Start Diagnosis in SI and repair as necessary. The Hard Start Diagnosis will also link to the Fuel System Diagnosis and Fuel Injector Diagnosis in SI. Typically, one of these procedures will isolate a fuel injector or fuel pump concern if the fuel pressure is obviously low, slow to build, or bleeds down quickly after the fuel pump stops running.
If the procedures above do not isolate a cause for this concern because the fuel pressure is not obviously low, is not slow to build, and does not bleed down quickly after the fuel pump stops running, perform the following suggestions:
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.