Fuel System - Low Power On Wide Open Acceleration

Classification: FE07-004

Reference: NTB07-040

Date: June 6, 2007

2004-2007 TITAN AND ARMADA; LOW POWER WITH WIDE OPEN THROTTLE

APPLIED VEHICLES:
2004 -2007 Titan (A60)
2004 - 2007 Armada (TA60)

APPLIED VINs:
2004 - 2006, all VINs
2007 Titan built before 1N6(*)A0(***)7N 236037
2007 Armada built before 5N1AA08(**)7N 720223

APPLIED DATE:
Built before February 22, 2007

IF YOU CONFIRM

When accelerating with Wide Open Throttle (WOT) the engine power is reduced,

ACTIONS

1. Check fuel pressure during a transmission "Stall Test" (see Service Procedure).

2. If fuel pressure test is NG, replace the fuel pump.

NOTE:
Low fuel pressure may cause DTCs to be detected. If you have DTCs with this incident, first replace the fuel pump and then recheck the DTC diagnosis.

IMPORTANT:
The purpose of "ACTIONS" (above) is to give you a quick idea of the work you will be performing. You MUST closely follow the entire Service Procedure as it contains information that is essential to successfully completing this repair.





PARTS INFORMATION

CLAIMS INFORMATION





Submit a Primary part (PP) type line claim using the claims coding table shown.

SERVICE PROCEDURE

1. Connect a fuel pressure gauge to the engine (special tool kit J-44321 or equivalent).

^ Follow all instructions under "Fuel Pressure Check" in Section EC of the Service Manual for connecting the fuel pressure gauge.

2. Look at the fuel pressure while performing a transmission "Stall Test".

^ The Stall Test 10 minute warm up is not needed for this Service Procedure.

^ Follow all other instructions for performing the Stall Test under "Inspections Before Trouble Diagnosis" in Section AT of the Service Manual.

CAUTION:
Do not hold down the accelerator pedal for more than 5 seconds while performing the Stall Test.

^ Fuel pressure is NG if it drops below 45 psi during the Stall Test.

> If the fuel pressure is OK, this bulletin does not apply. Return to ASIST for further diagnosis and repair information.

> If the fuel pressure is NG, go to step 3.

3. Replace the fuel pump.

^ Follow all instructions under "Fuel Pump Assembly, Removal and Installation" in section FL of the appropriate Service Manual.

^ Use the fuel pump listed in the Parts Information.

^ Make sure to use a new fuel pump O-ring seal.

4. Test drive the vehicle; make sure the incident is fixed.

NOTE:
^ Low fuel pressure may cause DTCs to be detected. If you have DTCs with this incident; first replace the fuel pump and then recheck the DTC diagnosis.

^ DTC diagnosis and repair is not covered by this TSB.





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