canon_mutant

There's a theory a few of us have that below 32F the intake air sensor goes to 0 and flat lines there. One person over on F150Ecoboost doing some after market tuning noticed it. I am still looking for a laptop monitor ap or some other way to read mine to see if it's doing the same. If not, I am going in next week to get the first oil change, re-re-re-SYNC , this TSB, and hopefully it will be cold enough for them to check the intake air temp sensor.

This would certainly explain the cold weather mpg problem! Geez, my drive this morning was clear down to 13.5mpg . I would have gotten between 17 and 18 last summer.

Remember that Mars probe that slammed into the planet at 17,000 mph because someone was writing code in metric distance and others in english? Going from F to C when it crosses the freezing threshold would explain a lot.

MPG not necessarily related to shudder though . . . ALERT

WalleyeRun

I agree....! It is a stall tactic. I just went through this with my "07" Chevy and the oil consumption issue. I have a payment coming up again the end of the month and I can hardly write the check I want to trade it in and get something else but I am affraid I will really take a beating. Others I have spoken to are doing the same thing. This issue is becoming well known. On other sites are ref them as "Shudder Boxes". I wonder if this is why sales of the F150 are only up 7.5% vs Jan where Ram sales are up 40+%. I think I am going back to Japanese vehicles. I have been burnt the last two times and I have had enough................................!

Night-Hook

The TSB did not work on my truck it is still doing the same thing. It going back Monday for the SM to ride in it so he can see. Based on what I am reading I don’t think that will make any difference. The strangest thing on the service was in Mode 6 it showed no Backfire or misses which makes me wonder if it is the CATCovert It about 65-70 deg here so I don’t think it has nothing to do with any sensor of temperature. Again Thank all of for your imput

Damn Dirty Ape

iTrader: (1)

A number of mild hills here and there. Not flat by any means just mixed.

LRPV

Update. I had the TSB thing done Thursday. My shudder problem was improved. I now feel ONE miss or a slip or something at the beginning of the hill but I don't get the shudder the rest of the way up. I noticed that some guys are saying they have improved throttle response and power. If anything, my truck feels sluggish now, it had better power and throttle response before the TSB flash. My mileage seems to be just as bad as before. I still have an "odd" 3rd gear shift. I sometimes have to hit the "up" button on the shifter to see the gears.

The shudder is seems to be less severe anyway.

summertop511

The odd third gear shift should do that since it won't downshift into second third acts for second then fully locks into third.

mikelee_03

Update: Took truck for approx 400 mile round trip from fargo to hibbing mn yesterday. I reached the 20 mpg threshold for the first time! I feel the shudder has not been improved at all with the refash. If anything it has gotten worse.

Bob_Mac

I have made a request that this thread be made a sticky along side Bucketman's thread as this is affecting quite a few 2011-2012 trucks.

Deerhunter4

Drove 250 miles since the reflash. I think my shudder has improved but not completely gone. I pulled my Yamaha Rhino 220 miles yesterday and the shudder didn't drive me crazy like it did before. I only averaged 12.9 mpg because the windshield on the Rhino is like pulling a sail.

Longjt

The last few days my 5.0L seems to be 'misfiring' (shudder?) more than usual. It only happens around 60 mph and 1500 rpms. Is this the same issue that the other 5.0L owners are experiencing and discussing in this thread? Sorry EcoBoosters....not trying to hijack the thread.