PCM/Engine - Induction Backfire

Article No.
99-14-10

07/12/99

^ INDUCTION BACKFIRE - VEHICLES IN MEXICO
ONLY WITH 4.2L ENGINE

^ ENGINE - 4.2L - INDUCTION BACKFIRE - VEHICLES
IN MEXICO ONLY

FORD:
1998-1999 F-150

ISSUE
Induction backfire on accelerations and decelerations during all ambient temperatures may occur on some vehicles. This may be caused by carbon buildup on the intake valves due to high sulfur content in the gasoline and the Powertrain Control Module (PCM) calibration.

ACTION
Reprogram the PCM. If the backfire concern has not been resolved, perform normal diagnostics. Be sure to perform intake valve deposit inspection procedure (carbon blasting with walnut shells) or replace the intake valves with new Intake Valves (F65Z-6507-AA).





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 2 Years/40,000 Km Warranty Coverage For Mexico

OPERATION DESCRIPTION TIME

991410A Reprogram Powertrain 0.4 Hr.
Control Module (PCM)

991410B Extra Time To Inspect 0.4 Hr.
Intake Valves

991410C Extra Time To Clean 2.9 Hrs.
Intake Valves (DO NOT
Use With Operation D)

991410D Extra Time To Replace 8.9 Hrs.
Intake Valves (DO NOT
Use With Operation C)

DEALER CODING
CONDITION
BASIC PART NO. CODE
6507 49

OASIS CODES: 613400, 613500, 613700