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2013-2015 F-150, Expedition, Navigator, and Transit – 3.5L GTDI popping sound on cold startup
2013-2015 F-150, Expedition, Navigator, and Transit vehicles equipped with a 3.5L GTDI engine can exhibit a popping sound on cold startup that can be isolated to the Charge Air Cooler (CAC) system or air intake area.
The Powertrain Control Module (PCM) will open the turbocharger bypass valve during cold engine start-up, After about 30 seconds, the valve closes, which may result in a popping sound.
This noise is considered normal operation and no repairs should be attempted to resolve this condition.
For further information, refer to Workshop Manual, Section, 303-00, Engine NVH and Section 303-14, Description and Operation.
