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2011+ 55-60mph 5.0 Shuddering and EcoBoost Engine Miss/Loss of Power - Possible Fixes

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2011+ 55-60mph 5.0 Shuddering and EcoBoost Engine Miss/Loss of Power - Possible Fixes

Old 05-31-2012, 10:18 PM
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Originally Posted by HunterSmitty
dcfluid, I absolutely agree there are 2 conditions here. But the shutter under light load is related to running crappy under certain conditions. Like I said, engine misfires are present under this scenario, so they are one in the same to me. The way youre describing why it would be more noticeable on the ecoboost would be accurate if the cylinders on the 2nd bank weren't showing these misfires clear as day. Which means something is happening in the cylinders themselves.

But I do think many people are mistaking the slight shutter from the transmission when close to shift points under load. This is nowhere near as intense as when the Ecoboost is really shuttering.
I believe you when you say the misfires point to the other problem, but most people don't get a miss fire code and they claim shudder day in day out regardless of conditions. For those shudder sufferers simple low rpm power train issues may be the cause of the symptoms.
For others who have symptoms come and go with the weather and/or misfires have another problem to deal with.
Worst case scenario?
You got both at the same time.... try and diagnose that one!
Then you could add the 50 to 60 mph drive train balance issue I've had to really mess you up.
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Old 05-31-2012, 11:14 PM
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Originally Posted by dcfluid

OK. FX4 Ecoscrew 157"wb.
How the hell can anyone get these trucks to go up a grade of any kind in 6th gear at 1200 rpm? That is seriously lugging a little V6 way below a smooth power band area. Of coarse it will feel rough with a load at that rpm. My truck will disengage the torque convertor anything that low with the slightest throttle jumping RPMs up well over 1500.
I can understand upset with rough or shaky pulling along at 1300+ but a 6 cylinder barely above idle is going to feel rough compared to a V8.
When I tease mine to operate that low with a load it does have rougher power pulses and V6 rumbling, that smooths out as I gain a couple hundred rpm.
If peoples transmissions are forcing the engine to run that low under load I would think transmission reprogramming to unlock the torque convertor or shift down to 5th a little sooner would be in order.
I wonder how many people have now confused an engine miss firing with V6 vs V8 smoothness, and now convinced themselves that they have an engine problem....
Said this a couple pages back!! I like where your mind is at.
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Old 06-01-2012, 09:37 AM
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After reading people describe this as a shake/vibration, I think there may be even more than two issues. When my truck does it, you can hear the turbos blow off, and the truck pulsates into/out of boost(or misfire?) enough that you can actually hear it AND feel the truck jerk back and forth. I'm not an expert, but maybe this condition is related to the intercooler condensation. As it builds boost and load is added going uphill it throws water into the engine? Causing a misfire which in turn screws with the turbos?

My issue is definately not just a vibration or shaking as some seem to describe it. Maybe they are all related? Just interesting to read the differing descriptions.

Mine has seemed to get better now with warmer weather, but I have felt it on a few occaisions, just yesterday in fact. I have had the fall on its face issue twice. I believe on my truck my issues are all related to condensation in the intercooler.
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Old 06-01-2012, 02:10 PM
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Ok I have always had the shutter and never got any codes. Well today I finally had the truck fall on its face (scary). Plugged in my obd bluetooth wrote down the four codes (sorry on the phone right now cant look them up). Pulled over shut the truck off started it back up, checked for codes again and they are gone. Major change in gas milage once the water was gone until it started to build again and start shuttering.
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Old 06-01-2012, 07:40 PM
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I have the 55mph shutter(barely noticable), I also have the cold start miss #2 cylinder, went to dealer got the flash..no miss fire yet. but no shift into 6th until 62mph...That should take care of the shudder at 55mph.
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Old 06-01-2012, 07:50 PM
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Hmm. That 62MPH shift to 6th must be new with the flash. Mine shifts to 6th gear at 42MPH.
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Old 06-01-2012, 07:54 PM
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Originally Posted by ilmo
Hmm. That 62MPH shift to 6th must be new with the flash. Mine shifts to 6th gear at 42MPH.
What flash? Is there a new one?
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Old 06-01-2012, 07:59 PM
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Took my truck to the dealer again today for the shudder, and was again basically told no codes, no problem. My CSM Jeffrey will get an ear full about that on Monday. On a positive note; they did finally acknowledge my steering was sticking, and I'm taking it back Tuesday for a new steering rack. One major complaint down, one to go...
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Old 06-02-2012, 02:18 AM
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I agree with others that there is likely more than one type of shudder between 50 and 60 even. Others have seen it in lower gears at lower speeds. Some have reported it with the 5.0 as well.

So IMO the problem STARTS because the tranny is in 6th and lock up and doesn't just unlock and downshift the second it sees the additional load [of the incline or even a strong headwind has caused it on mine]. Mine will also shift into 6th in the 40s [haven't recorded 40-what? but I know it does] and it seems that below about 55 the tranny will unlock and downshift when it sees additional load. But about 55 the damn thing seems determined to stay in 6th and I think in lockup too and is only running 1500 rpm. So, tiny motor, not yet producing boost, too high of a gear for the load => lugging. This should happen on both the EB and 5.0 but the reason I think it's worse on the EB or more pronounced might be a better word is that once I feel the first jerk then I start hearing the turbos and waste gates start fighting each other as if the engine computer is trying to resolve the lugging problem with additional boost that the low throttle position cannot use and a downward spiral ensues. All the freakin' thing needs to do is unlock minimally and downshift to 5th too preferably and I think => no problem!

And mine will shudder independent of the high humidity falling on its face problem which will occur at any speed when you romp on the throttle after cruising lower rpms in rain or high humidity for a period of time. Happened to me twice the last couple of days as it's been cool and rainy here in Kansas. Sadly was too busy to talk to my Iowa dealer this week like I wanted to push the rope. I am running out of time. Lemon Law in July if no progress and that's just going to be freakin' sad, period. This truck has SO much potential if they'd just own up and fix it.
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Old 06-02-2012, 09:44 AM
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My shudders are the following, like most between 50-60mph, ok low RPM !!! Also they replaced the rear axle ''shims'' so this one although it didn't really bother me, is almost gone. The one that really bugs me is when I floor it, it feels like it's ''missing'' like some here have mentionned. Fell on it's face once last fall while coming back from New-Brunswick, cruise control and LOTS of rain. Also during that trip, twice the engine shudered so hard that I thought the ttranny would fall off the car. Since then, I got 3 flashes the last one beeing early march. With this new flash (TSB feb 2012) the trannny doesn't go in 6th gear at 40mph but it still shudders when flooring it and my milleage sucks. All those times, I never got any CEL come on and never any codes. I didn't do any long trips yet since.

South shore

Last edited by Vwluca; 06-02-2012 at 09:47 AM. Reason: error
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