Engine Controls - Rough Idle/Hesitation

Article No.
03-9-11

05/12/03

DRIVEABILITY - ROUGH IDLE AND/OR HESITATION
ON ACCELERATION - VEHICLES EQUIPPED WITH
5.4L OR 6.8L ENGINE ONLY

FORD:
2000-2003 E-350, E-450, EXCURSION, SUPER DUTY F SERIES

ISSUE
Some F250-F550 Super Duty and Excursion vehicles equipped with a 5.4L or 6.8L engine, and some E350/450 vehicles equipped with a 6.8L engine may exhibit a rough idle and/or hesitation when accelerating. This may occur intermittently within the first 2-3 minutes after start when engine is not warmed up (ie., conditions other than hot restart). The condition is more likely to occur at ambient temperatures of approximately 60° F (160 C) and higher, and may be aggravated by an unmetered air leak or exhaust leak.

ACTION
This article must be followed as specified to effectively correct symptoms. Read the article completely before starting service. Refer to the following Service Procedure for details.

SERVICE PROCEDURE

F250-F550 Super Duty and Excursion

Service any unmetered air leak, exhaust leak, wiring or other related concern. Replace both front H025 sensors with the part number listed in this article.

E350/E450





Refer to the E-Series Only PCM Calibration Chart. Do not perform this TSB if the vehicle's calibration is not listed in the chart. Service any unmetered air leak, exhaust leak wiring or other related concern. Replace both front H025 sensors with the part number listed in this article.

1. Refer to the PCM Calibration Chart FOR E-SERIES ONLY to verity that vehicle is addressed by this TSB. Do not perform this TSB on an E-Series vehicle if the calibration is not listed in the E-Series Only PCM Calibration Chart.

2. Perform thorough diagnostics in accordance with the applicable PC/ED Workshop Manual, and service any issues.

3. Replace both front H025 sensors, with Part Number 354Z-9F472-BA.





NOTE
THE NEW HO2S CONNECTOR (BLACK) REQUIRES THAT THE CLOCKING TAB LOCATED AT THE 4:00 POSITION BE REMOVED. REFER TO FIGURE 1 FOR REQUIRED ELECTRICAL CONNECTOR MODIFICATION FOR MATING WITH VEHICLE WIRING HARNESS. FOLLOWING THE MODIFICATION, VERIFY THAT CONNECTOR MATES FULLY AND LOCKING FEATURE IS ENGAGED. THE ELECTRICAL CONNECTOR HARD-SHELL COLOR OF THE NEW HO2S SENSORS WILL BE BLACK INSTEAD OF GREEN.





Obtain an Authorized Modifications Decal (FPS 8262 - obtainable through DOES II, 25/pkg) and list the date, dealer number, and summary of modifications performed. Select a prominent place adjacent to the Vehicle Emission Control Information Decal suitable for installing the Authorized Modifications Decal. Clean the area, install the decal, and cover it with a clear plastic decal shield.





Parts Block

OTHER APPLICABLE ARTICLES: NONE
WARRANTY STATUS: INFORMATION ONLY
OASIS CODES: 608000, 608400, 608500, 609000, 609400, 609500, 611000, 611500, 698298