Intermittent Extended Crank During Hot Soak Restart - keywords debris dust fuel hard injectors inlet long module no pump rail repeat start

This PI was superseded to update Recommendation/Instructions. Please discard PIP4450.

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:

1. Allow the engine to run until operating temperature is achieved and turn off the engine.
2. As a safety precaution, disable the fuel injectors and ignition coils by pulling the INJ-A and INJ-B fuses in the UBEC.
3. Follow SI procedures to lift up the fuel rail, leaving the fuel feed line connected and all fuel injectors installed.
4. Place card board or a shop towel under all fuel injector tips.
5. Use the Tech 2 to pressurize the fuel system while in the KOEO position.
6. Close the hood and allow the engine to hot soak for the period of time described by the customer (typically 30-60 minutes).
7. Open the hood and inspect the tips of all fuel injectors for drips.

•	If only one fuel injector drips, or is ready to drip, replace just that fuel injector and re-evaluate the concern. Cleaning the fuel injectors will not correct this fuel injector concern.

•

If two or more fuel injectors drip, or are ready to drip, mark the injector body with a paint pen to identify them as a leaking fuel injector and replace all eight fuel injectors, the complete fuel rail assembly, and the fuel tank fuel pump module. When replacing the fuel tank fuel pump module, inspect for debris in the fuel tank. If debris is present, clean the debris from the tank by following the Fuel System Cleaning procedure in SI. After completing the repairs, call Ashmi Haria at 586-492-5418 so she can arrange to get all of the parts back for engineering inspection. Cleaning the fuel injectors will not correct this fuel injector concern.

8. Follow SI procedures to reassemble the engine, install the INJ-A and INJ-B fuses, clear any DTCs that may have set as a result of having the fuses removed, and re-evaluate the concern.

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.