F 150 2WD Pickup V6-4.2L VIN 2 (1997)
Technical Service Bulletin # 99-18-8
Date: 990906
Engine - Induction Backfire On Acceleration
Article No.
99-18-8
09/06/99
INDUCTION BACKFIRE - ON ACCELERATION - ALL
AMBIENT TEMPERATURES - VEHICLES WITH 4.2L
ENGINE - CANADIAN VEHICLES ONLY
FORD:
1997-1999 F-150
This TSB article is being republished in its entirety to include 1998 and 1999 model year vehicles.
ISSUE
Some vehicles may backfire on acceleration. This may occur at all ambient temperatures and may be caused by excessive Intake Valve Deposit (IVD).
This may be due to carbon deposits on the intake valves.
ACTION
Perform diagnostics and clean intake valves if required. Refer to the following Service Procedure for details.
OTHER APPLICABLE ARTICLES: 93-12-6, 97-12-9
SUPERSEDES: 99-3-4
WARRANTY STATUS: Eligible Under The Provisions Of Bumper To Bumper Warranty Coverage
OPERATION
DESCRIPTION
TIME
991808A
Perform Intake Valve
0.5 Hr.
Deposit (IVD) Inspection
991808B
Perform IVD Cleaning
2.8 Hrs.
991808C
Extra Time To Reprogram
0.6 Hr.
Powertrain Control Module
(PCM) And Replace Spark
Plugs
DEALER CODING
CONDITION
BASIC PART NO.
CODE
6507
49
OASIS CODES: 613000, 613500
Service Procedure
1.
Perform normal diagnostics found in the 1997 Powertrain Control/Emissions Diagnosis (PC/ED) On-Board Diagnostic II (OBD-Il) Service
Manual or the latest version CD-ROM in Service Bay Diagnostic System (SBDS) or Service Bay Technical System (SBTS). Service as required.
2.
On vehicles built prior to 4/16/1997, check to see if TSB 97-12-9 has been performed. If not, reprogram the Powertrain Control Module (PCM)
per TSB using SBDS or New Generation Star (NGS) Tester. Use April 1997 level CD-ROM calibration or later. Also, replace the
(AWSF-42E-EG or -EE) spark plugs with the Spark Plugs (AGSF-34E-E) per TSB 97-12-9.
3.
If normal diagnostics in Step 2 have not resolved the driveability concern, proceed with the following Intake Valve Deposit Inspection Procedure.
INTAKE VALVE DEPOSIT INSPECTION PROCEDURE
1.
Remove any two (2) spark plugs. Use a remote starter switch to bump the engine over until the intake valve is fully open in the cylinder to be
inspected.
2.
Use Rotunda kit 014-00975 Automotive Borescope or equivalent to inspect the back side of the intake valves through the spark plug holes for the
