Engine - Detonation/Knock In High Temperatures

Article No.
98-25-18

12/21/98

DETONATION - DETONATION/SPARK KNOCK
DURING ACCELERATION IN AMBIENT
TEMPERATURES GREATER THAN 32 DEGREES
CELSIUS (90 DEGREES FAHRENHEIT)

FORD:
1998 CROWN VICTORIA

LINCOLN-MERCURY:
1998 GRAND MARQUIS

CALIBRATION
8-18F-R09/R12, 8-18H-R09/R12, 8-18I-R09/R12

WARNING
THIS MODIFICATION IS AUTHORIZED ONLY FOR THE LISTED ENGINE(S). PERFORMING THIS MODIFICATION ON OTHER ENGINE CALIBRATIONS IS UNAUTHORIZED AND COULD CREATE LIABILITY UNDER APPLICABLE FEDERAL OR LOCAL LAWS.

ISSUE
Some vehicles may exhibit a concern with light spark knock/detonation while accelerating in ambient temperatures greater than 32°C (90° F). This may be caused by too much spark advance commanded by the calibration when operating at high ambient conditions.

ACTION
Reprogram Powertrain Control Module (PCM) with revised powertrain calibration. The revised calibration should reduce the possibility of spark knock at high ambient temperatures. Refer to the following Service Procedure for details.

SERVICE PROCEDURE

1. Perform normal diagnostics and repair as necessary.

2. If no engine or component concerns are identified, reprogram the PCM calibration using the latest level CD-ROM.





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
WARRANTY STATUS: Eligible Under The Provisions Of Bumper To Bumper Warranty Coverage

OPERATION DESCRIPTION TIME

98251BA Reprogram Powertrain 0.6 Hr.
Control Module (PCM)

DEALER CODING
CONDITION
BASIC PART NO. CODE
RECAL 42

OASIS CODES: 497000, 615000, 615500, 615600, 702000, 702100