Engine - Spark Knock/Detonation Above 90 Degrees F.

Article No.
99-15-5

07/26/99

SPARK KNOCK - DURING ACCELERATION IN
AMBIENT TEMPERATURES GREATER THAN 32
DEGREES C (90 DEGREES F) - VEHICLES BUILT
THROUGH 1/1999

FORD:
1999 CROWN VICTORIA

MERCURY:
1999 GRAND MARQUIS

ISSUE
A light spark knock/detonation may occur while accelerating in ambient temperatures greater than 32°C (90°F). This may be caused by the Powertrain Control Module (PCM) calibration.

ACTION
Reprogram the PCM. Refer to the following Service Procedure for details.

SERVICE PROCEDURE

1. Perform normal diagnostics in accordance with the 1999 Powertrain Control/Emissions Diagnosis (PC/ED) Service Manual and repair as necessary.





2. If no problem was found, reprogram the PCM with the latest level calibration using Service Bay Diagnostic System (SBDS) or New Generation Star (NGS) Tester. Refer to the following PCM Reprogramming Information Chart to identify the appropriate calibration.





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: 98-25-18

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

OPERATION DESCRIPTION TIME

991505A Reprogram Powertrain 0.6 Hr.
Control Module (PCM)

991505B If PC/ED Diagnostics Are
Required, Use "A" Time
Per The Warranty And
Policy Manual

DEALER CODING
CONDITION
BASIC PART NO. CODE
RECAL 42

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