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Engine Control - Knocking Sound

Article No.
03-21-13

10/06/03

NOISE - "KNOCKING" SOUND - VEHICLES WITH 7.3L
DIT ENGINE - CALIFORNIA EMISSION VEHICLES
ONLY

FORD:
1996 E-350, F-250, F-350

Article 96-16-7 is being republished in its entirety as part of a consolidated 7.3L diagnostic aid booklet.

ISSUE

Engine noise similar to a rod knock may be heard on some vehicles. This noise usually occurs at idle, but can occur at other speeds and is due to the combustion characteristics of the new injectors for California emission vehicles with a 7.3L DIT engine.

ACTION

Use the following Service Procedure to determine if reprogramming or replacing the Powertrain Control Module (PCM) with a revised calibration/PCM is required.

SERVICE PROCEDURE

WARNING
THIS MODIFICATION IS AUTHORIZED ONLY FOR THE LISTED ENGINE CALIBRATIONS.

NOTE
BEFORE SERVICING VEHICLE, CHECK FOR AN AUTHORIZED MODIFICATION DECAL, FPS 8262, ON THE FAN SHROUD INDICATING REPROGRAMMING OR REPLACEMENT PERFORMED.

1. Perform the diagnostic procedures in the 1996 Powertrain Control/Emissions Diagnosis (PC/ED) Manual for this symptom. Service as required.





2. Reprogram the PCM with the appropriate calibration per the PCM Calibration Information Chart shown using the latest calibration update.




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.

OTHER APPLICABLE ARTICLES: NONE
SUPERSEDES: 96-16-7
WARRANTY STATUS: INFORMATION ONLY





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