Recipe - Ford 3.5L EcoBoost Gasoline (F-150, Expedition, Transit, Raptor - 2011-present)
Specific Fix build
Reliability tier: aggregated - verify before ordering, see /disclosure/
Ignition service for the boost-stressed 3.5L EcoBoost: misfire DTCs first, then plugs and the failed coil(s). Turbo-GDI plugs live a shorter interval than NA engines - gap erosion reads as random misfire under boost. Sort the humid-weather single-event shudder (CAC condensation) out before ordering ignition parts; the coil-swap diagnostic from SSM 50412 (MY2021-2022) applies on Gen3.
Parts
- 3.5L EcoBoost Spark Plug, Gen1 (current number CYFS-12-YT4X) - Gen1 plug set (CYFS-12-YT4X, 2011-2016 F-150 / 2015-2017 Expedition); 6 per engine (qty 6)
- 3.5L EcoBoost Spark Plug, Gen2 (current number CYFS-12Y-PCTX) - Gen2 plug set (CYFS-12Y-PCTX, 2017-2019 F-150 / 2018-2019 Expedition) (qty 6)
- 3.5L EcoBoost Spark Plug, Gen3 (DYFS-12Y-PT) - Gen3 plug set (DYFS-12Y-PT, 2021-2025 F-150) (qty 6)
- 3.5L EcoBoost Ignition Coil, Gen1 (BL3Z-12029-C) - Gen1 COP coil (BL3Z-12029-C) - replace the misfiring cylinder's coil after the swap test (qty 1)
- 3.5L EcoBoost Ignition Coil, Gen2 (current number HL3Z-12029-D) - Gen2 COP coil (HL3Z-12029-D) (qty 1)
- 3.5L EcoBoost Ignition Coil, Gen3 (ML3Z-12029-C) - Gen3 COP coil (ML3Z-12029-C) (qty 1)
Install order
- read misfire DTCs + freeze frames; rule out CAC-condensation (single humid-weather event, multi-cylinder) and fuel-side causes first
- pull the misfiring cylinder's coil and plug; inspect gap/erosion and boot condition
- swap-test the coil to a neighbor cylinder (SSM 50412 pattern on Gen3) to confirm the coil before replacing
- install the plug set on the turbo service interval; replace the confirmed coil(s)
- clear adaptives and road-test under boost; re-check fuel trims if the misfire returns
Expected outcome
Misfire resolved without touching injectors or the turbo system; plugs on the correct short interval prevent the recurring boost-misfire cycle.
Parts budget
About $80-$100 in parts. It depends on what the diagnosis finds; each option below is what you buy together. Prices marked "at Dave's" are Dave's Auto Center's, the same as in his store; the others are approximate prices from OEM and maker catalogs, rounded (a manufacturer's list price can run higher). Parts only, no labor.