I was driving down the expressway yesterday and started to get an engine surge/shake/shudder when the truck shifted into overdrive and low rpms (40-55 mph).

The truck runs completely fine at all other speeds, gears, and idle. It just seems to be that initial shift into overdrive at lower rpms.

Finally got it to draw a flashing engine code while the shaking/surging was occurring but the engine light quit flashing when i got off the freeway and the shaking quit...

Was able to pull 2 codes in the history

P0174 Fuel system lean bank two
P0308 Cylinder 8 Misfire Detected

Not really sure what the issue could be. Thinking a possible COP on the #8 cylinder ?.. Any suggestions would be greatly appreciated

 

i have the same issue but im getting a code for cyl 6
i'll be picking up a COP for cyl 6 on monday and hopefully that will solve my problem. I tried cleaning the MAF sensor, and changing the air filter and those didn't help my situation

 

are you only getting the shake/surge in overdrive and low rpms? Please let me know if the new COP fixes this issue.

 

yes those are the symptoms low rpm's and od between 45-60mph

 

Did you have any luck with the COP replacment?... I'm currently out of town and plan on replacing my #8 COP Friday evening.. Really hope this fixed your issue, I really have no other ideas if this isn't the issue

 

TSB for the shudder.. my truck suffers from that now...it happens to everyone... you'll get a flash and it will be back in 2 weeks... you'll just have to live with it.. I've done all the fluids...flushed everything... still shudder... also read to try Dr. Tranny for the shudder fix.. i have some shipping to me today... .. now if someone could help me with the hissing!... see bucking and hissing post!

------------------------------------------------
TSB
05-10-12 HARSH 3-2 DOWNSHIFT BETWEEN 17-25 MPH (27-40 KM/H) - NO DTCS - 4R75E AUTOMATIC TRANSMISSION - VEHICLES BUILT BEFORE 4/20/2005

Publication Date: May 13, 2005

FORD: 2005 F-150
LINCOLN: 2006 Mark LT


ISSUE:
Some 2005 F-150 and 2006 Mark LT vehicles built before 4/20/2005, equipped with the 5.4L engine and 4R75E automatic transmission, may exhibit a harsh 3-2 downshift between 17-25 MPH (27-40 Km/h) with no diagnostic trouble code (DTC), and a driveline clunk between 40-50 MPH (64-80 Km/h).

ACTION:
Reprogram the powertrain control module (PCM) to the latest calibration using WDS release B37.4 or higher. Calibration files may also be obtained at www.motorcraft.com.


WARRANTY STATUS:
Eligible Under Provisions Of New Vehicle Limited Warranty Coverage

OPERATION DESCRIPTION TIME
051012A 2005 F-150, 2006 Mark LT, All Equipped With 4R75E Transmission: Check Diagnostic Trouble Codes And Reprogram The Powertrain Control Module (Do Not Use With 12650D, 12650D84) 0.4 Hr.

 

depending on how many miles are on it, id bet its the plugs or COP's. probably the plugs.

 

Sorry to bug you on this, did you have any luck with the COP on your #6 cylinder?..Thanks for any help

 

Had same issues, shuddering and surging around 45-50 when it goes into overdrive, but could gas it thru that range with no problem. Sometimes even at higher speeds when you let off gas a little would get shuddering. 151K on truck did plugs around 105K. Ordered COP's from uneeksupply on Ebay, whole set for $114.95. Installed this weekend and problem is gone. Sure glad its not the tranny. definitely check plugs and COP's.

 

b3ross, How many miles on your 2004? Probably time to do the plugs and COPs. I recommend custom tuning as well.

 

What the hell is a COP? Wise guys need not reply

 

Coil On Plug

 

I have the same problem with my 06 F150 SCrew... I am cheap, where should I start??? Plugs or COPs?

 

Of you have a hissing check for a vacuum leak.

 

Please explain... can I do this myself? Any YouTube videos out there to watch? I usually work on mopeds, so this is new.