HunterSmitty

Why do the same cylinders misfire when the bogging issue happens and the 55-60mph shudder on the Eco's? Both are the 2nd bank of cylinders (4, 5, 6). It is related to the Intercooler issue.

Mach 1

Are you guys feeling the PWM control on the convertor and calling this shudder? Do you guys have a low speed/high load misfire that you are calling a shudder, these might be the 2 classifications to the shudder.

So we can refer to the shudder as the PWM shudder or LSHL shudder..


I live in the hill country west of Austin Texas and drive it every day. I dont feel it as bad as people are making it out to be..but then I have a 2WD w20's and may not be loading it as severely as they do..I do pull the hills at 50mph or even 45mph in 6th and with TC locked and no downshift.

I can see the 4WD loading the TC more, because of the additional weight/load.

The 6spd is still far for perfect, still quirky, however light years ahead of the latest generation auto's..

Has anyone looked into aftermarket coils yet like what are available on the Mustang? I would be interested in doing some testing.

TJPlatinumEB

I've datalogged it in the torque app when mine has done the shudder at 55mph and there is no misfire of anykind reported when it happens. The pressure of the fluid in the transmission or the converter, wherever it is measuring it from suddenly goes all wacky and off the charts when this occurs, but again, NO MISFIRE of any kind.

I'm not sure why dealers haven't seen it or can log it. I have seen several instances here on this forum where people log the incidents and those pressure readings are going ape **** when that 55mph shudder happens. And again if it was the intercooler, which i don't believe in any way to begin with is an issue, then the 5.0 wouldn't be having the SAME exact issue.

Same transmission, same torque converter, different motor, same issue. Hmmmm....common sense tells me the common denominator is not about which motor you have.

HunterSmitty

There are actually 3 issues. There is a transmission/torque converter issue that is showing up on all of the engine lineup. This happens commonly around shift points.

The 2nd issue is the Ecoboost misfires at 55-60mph. This DOES show up on the Ford Diag computers and on the 2nd bank of cylinders. I had this exact issue, as have many other people on the forum.

The 3rd issue is the bogging/falling on the face issue. Sometimes it does give a CEL, and is almost always showing codes on the 2nd bank of cylinders.

So yes, you're right about a slight shudder being present on other engines. As I've said before though, if you put a 5.0, 6.2 or 3.7L owner who THINKS they have a shudder issue, and put them in an Eco owners truck that has the shuddering (NOT to be confused with the bogging issue), they will realize their vehicle has a very different issue.

maplelakeduckslayer

And its hard to say if it is really the exact same issue. Some people are saying they have this shudder and its just kind of a vibration/shaking feeling in the truck, like going over a bumpy road. Thats how some have described it. On mine it lurches the truck back and forth, in and out of throttle. You can hear the turbo come in and out of boost. I for one feel that there are a few different issues that some people are combining into the shudder. Upon very close analysis of mine when going up hill, I actually feel I have both issues I described when going up hill in 6th. But the one where you can here the turbo cutting in and out hasn't happened since Winter. I can feel a vibration sort of feeling when going up hill in 6th right now.

EcoFX4d

It's also befuddling to me how if it were a torque converter issue, why can I get it to "chatter" at 56-58MPH going up a hill, but let it drop below to between 50-55, no chatter AND still in the same gear and no unlock of the TC. I don't see the engine putting out THAT much more torque within a what, 2-300RPM difference?

On the up side of this conversation, I have yet to feel a consistant shudder since the computer reset/deflector sheild install... Everytime I've thought I've felt it so far, I'm only feeling 2-3 small bumps and it stops, which could definately just have been the road. I think my butt has gone in to ultra sensitivity mode because I DO NOT and luckily HAVE NOT gotten the fall on it's face yet.