Vehicle applicability: This diagnostic supplement covers multiple Ford vehicles and engines. Follow the application named in the source below. Some references apply to vehicles other than Mustang.
DW4 CHECK FOR A SOURCE OF POTENTIAL HO2S CONTAMINATION
◾ use of unapproved silicon sealers ◾ fuel contaminated by silicon additives ◾ excessive oil consumption ◾ glycol leaking internally in the engine ◾ contaminated fuel ◾ short drive cycles in cold weather ◾ use of unapproved cleaning agents
Is a concern present?
Yes | No |
|---|---|
REPAIR the source of the contamination. CHANGE the engine oil and oil filter. RESET the keep alive memory (KAM). REFER to Section 2, Resetting The Keep Alive Memory (KAM). REPEAT the self-test. | GO to DW5 . |
DW5 CHECK FOR UNMETERED AIR LEAKS
Note: Fuel calculations can be affected by unmetered air leaks.
• Carefully inspect the following areas for potential air leaks:
◾ hoses connecting to the mass air flow (MAF) sensor assembly ◾ hoses connecting to the throttle body ◾ intake manifold gasket leaks ◾ positive crankcase ventilation (PCV) system ◾ the vacuum lines are disconnected ◾ incorrectly seated engine oil dipstick, tube or oil fill cap
Are any air leaks present?
Yes | No |
|---|---|
REPAIR the source of the air leak. RESET the keep alive memory (KAM). REFER to Section 2, Resetting The Keep Alive Memory (KAM). REPEAT the self-test. | GO to DW6 . |
DW6 CHECK FOR EXHAUST SYSTEM CONCERNS
NOTICE: Pressure above 241 kPa (35 psi) can cause damage to system components. Regulate the shop air to 34.4 kPa (5 psi) before connecting to the system.
• Pressurize the exhaust system at the exhaust pipe outlet with 34.4 kPa (5 psi) regulated shop air.
• Check the exhaust system for leaks using a soap and water solution.
• Apply the soap and water solution to the following areas:
◾ exhaust flanges and gaskets
2016 Mustang workshop publication supplied to Mustang Atlas. Original technical text and illustrations; HTML formatting by Mustang Atlas. Source page numbering is retained for traceability. Follow the configuration, revision, warnings, and cross-references in the material. About this edition.