Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSFORD1999F 150 2WD PICKUP V6-4.2L VIN 2REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTPROM - PROGRAMMABLE READ ONLY MEMORYTECHNICAL SERVICE BULLETINSCUSTOMER INTERESTENGINE - INDUCTION BACKFIRE ON ACCELERATIONOVERVIEW
1999 Ford F 150 2WD Pickup V6-4.2L VIN 2
Engine - Induction Backfire On Acceleration: Overview
1999 Ford F 150 2WD Pickup V6-4.2L VIN 2SECTION Overview
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
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
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.