More of an FYI for all F150 eco-boost owners. This has been a hot topic on other forums regarding the moisture build up in the turbos and the truck going into limp home mode. Ford release a fix but some are still reporting problems.
What’s Causing the EcoBoost to Shudder and Go Into Limp Mode?
Most drivers reporting EcoBoost issues say the trouble begins as a vehicle shudder – which can vary from a slight wiggle to a violent shake – that occurs during normal operation.
From there, the shudder problem can escalate to a computer override that puts the F150 into “limp mode,” which essentially kills all engine power. Considering that some F150 owners have reported going into limp mode while driving down the freeway, this is a pretty disconcerting situation.
Based on our investigation, the origins of the problem stem from the Charge Air Cooler (CAC).
A CAC cools the intake air after it passes through the turbocharger, just before the air enters the engine. A Ford technician spoke out on a forum saying that the CAC is working too well, as it’s cooling the intake air so much that condensation is forming inside the air intake tube. We confirmed this explanation with a couple of experts (including a Ford dealership service manager in Texas who wished to remain anonymous), but were unable to get official confirmation from Ford.
Here’s how it happens:
1.As air is drawn through the charge air cooler, moisture collects inside the tubing. This typically happens when the engine is cruising on the highway, as the air flow into the motor is relatively slow.
2.If the driver hits the throttle, the sudden change in the intake air flow rate through the CAC causes the engine to essentially vacuum up all the moisture inside the tube.
3.If the amount of condensation (water) the engine ingests is small, you just get a minor shudder. If the amount of condensation is significant, the F150′s computer system throws a red flag and forces the vehicle into limp mode to prevent further damage.
For drivers in areas where the dew point is equal to the ambient temperature for hours at a time, condensation inside the CAC is a frequent and sometimes severe problem