Originally Posted by VoiceOfReason
After the weather and temp fluctuations this past weekend during a torrential downpour, I had a power loss event and severe shaking while attempting to pass someone.
I'm almost convinced this problem is severe spark quenching. Especially after seeing the improvements the guys have been having reducing the gaps on the OEM plugs.
I've run into this problem a few times on other vehicles, both turbo and NA with various mods, it is nothing new nor specific to the Ecoboost. Ford is probably aware of this but until they nail down the exact source of the issue, there is no point in throwing more (expensive) parts and labour at the problem until the supply chain/engineering issue is resolved.
My problems aren't as severe as others appear to be, although I will soon be changing out my plugs, probably to an NGK dual fine element iridium type and gapping them somewhere around .034"
The eventual permanent fix for this from Ford may be a change to the plug specs, an upgrade to the ignition coils, or both. If you have some time and money to throw around, maybe someone could experiment with these changes and report back!
I tend to agree. I've read that the F-150's ignition system is fair at best. Many people with the 'fall on it's face' or shudder issues had a coil replaced which fixed their problem. Some have had bad plugs replaced which fixed their problem. And now many are reporting that plug gap adjustments are resolving their problems. While condensation is definitely contributing to some of the issues, I think it is exposing the weak ignition system. That explains why some people in the same area driving at the same time don't have any issues while their neighbor does. Maybe that neighbor has a borderline coil and a variety of plug gaps so the moisture added to those issues = 3 strikes.
If Ford is indeed redesigning the IC, that will eliminate one of the causes. It will then be easier to isolate the remaining weaknesses if needed.
This also explains why 20% of the posts in the shudder data base thread are from engines other than the 3.5. Eliminate moisture and many of the shudder issues go away but you still have a fair or average ignition system that could cause the same symptoms, just not as likely to happen.