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The 2008 Ford F-150 with a 5.4 liter engine does not have an EGR valve. Instead, it utilizes cam phasers to control exhaust movement, known as the "variable cam timing" system. On the other hand, the 4.2 and 4.6 liter engines in the F-150 use a standard EGR valve. The EGR (exhaust gas recirculation) component in a truck is responsible for recycling emission gases back through the engine to reduce harmful vapors, enhance fuel efficiency, and boost engine performance. A malfunctioning valve can lead to an improper fuel mixture, resulting in rough idling. If the valve fails, it will affect the truck's acceleration, idle performance, and fuel efficiency.
The EGR valve for the 5.4-liter engine in a 2008 Ford F150 can be found on the intake manifold of the motor.