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 MANUALSFORD2012FLEX AWD V6-3.5L TURBOREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTEMISSION CONTROL SYSTEMSDESCRIPTION AND OPERATION
2012 Ford Flex AWD V6-3.5L Turbo
Emission Control Systems: Description and Operation
2012 Ford Flex AWD V6-3.5L TurboSECTION Description and Operation
Engine Emission Control
3.5L
PCV System
NOTE: Do not permanently remove or render inoperative any part of the vehicle emission control system including related hardware. Failure to comply may violate applicable state and federal law.
NOTE: The vehicle emission vacuum routing diagrams are contained in the Description and Operation subsection of the Evaporative Emissions system.
The engine emission control system consists of the PCV system.
The PCV system:
- uses intake manifold vacuum to ventilate blow-by vapors from the crankcase.
- returns the vapors to the intake manifold for combustion.
The PCV system consists of the:
- crankcase ventilation tube.
- PCV valve.
The crankcase ventilation tube:
- is connected to the PCV valve and the intake manifold fitting with a spring clamp on the manifold end.
The PCV valve:
- varies the amount of blow-by vapors returned to the intake manifold based on available engine vacuum.
- threads into the RH valve cover.
3.5L Gasoline Turbocharged Direct Injection (GTDI)
PCV System
NOTE: Do not permanently remove or render inoperative any part of the vehicle emission control system including related hardware. Failure to comply may violate applicable state and federal law.
NOTE: The vehicle emission vacuum routing diagrams are contained in the Description and Operation subsection of the Evaporative Emissions system.
The engine emission control system consists of the PCV system.
The PCV system:
- uses intake manifold vacuum to ventilate blow-by vapors from the crankcase.
- returns the vapors to the intake manifold for combustion.
The PCV system consists of the:
- crankcase vent oil separator
- crankcase ventilation tube.
- PCV valve.
The crankcase vent oil separator:
- is retained by 3 bolts, mounted to the RH valve cover.
The crankcase ventilation tube:
- is connected to the PCV valve and intake manifold fitting with a quick connect coupling at each end.
The PCV valve:
- varies the amount of blow-by vapors returned to the intake manifold based on available engine vacuum.
- prevents combustion gases backfiring into the crankcase.
- threads into the crankcase vent oil separator, mounted on the RH valve cover.
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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.