Well so if this software fix lowers performance, don't they end up in VW Dieselgate territory? Not the emissions cheating, obviously. But if the car is not delivering the performance and/or economy the buyers paid for wouldn't they be entitled to compensation?
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1 day ago
I'm no engineer but I was a Ford master technician for quite a few years. Here's what I'm thinking: These little four cylinder turbocharged engines(and almost all Ford engines these days) have a ton of cylinder pressure at higher loads in order to make the power that they do. That being said, it's possible that the cylinder head is actually lifting off of the block due to the extremely high combustion pressures and causing coolant intrusion through that tiny space that's being created. Now, these engines have what is called VCT(Variable Camshaft Timing), this is for performance and fuel efficiency. This is controlled via the PCM(Powertrain Control Module). I'm thinking that they are reprogramming the VCT so that the intake valve stays open just a bit longer on the intake stroke and into the power stroke thus creating a lower compression ratio due to less air being used for the combustion event and causing less cylinder pressures to be used. It's the same principal as the Atkinson Cycle engine. This will reduce or eliminate cylinder head lift(possibly due to head bolt stretch, (because they are torque to yield bolts) and keep the coolant from entering the combustion chamber. This will cause loss of power no doubt, how much I don't know, but probably minimal. This is the only way that I can think of coolant entering the engine without otherwise being damaged to begin with being that the cooling system is a closed loop system. This is my best guess.
Last edited by CaptainHazelwood; 01/26/20 11:57 AM.