NHTSA Complaint #11535354 — 2017 FORD EXPLORER

Coolant was found to be infiltrating cylinders 2 & 3 of the engine. The engine was idling roughly and just about died before the check engine light came on. The service center did a pressure check and used a bore scope to confirm that there was coolant in the cylinders. My understanding of this problem is that the engine begins to misfire as coolant and oil mix and the cylinder walls start and other components deteriorate. When deterioration is bad enough the engine can quit. This can happen at any time including at high speeds on the highway. I'm not totally sure how long the rough idling had been going on, but the incident where the engine almost died and the check engine light came on was at about 80,000 miles. My guess is that the rough idling started around 70,000 miles -- give or take. Ford has not yet done a diagnostic teardown to determine how the coolant is infiltrating the cylinders, but it is a known problem for other sizes of the Ecoboost engine. I have the 2.3L Ecoboost. There was a recall on the 1.6L Ecoboost and there is a class action lawsuit for the 1.5L, 1.6L, and 2.0L versions of the engine.