This is a discussion on Post-AEM Performance issues now being reported by The Fast Late Truck (TFL) within the FCA/EPA 3.0L Diesel Settlement and AEM (Approved Emissions Modification) forums, part of the FCA/EPA 3.0L Diesel Settlement and AEM category; Originally Posted by vettelover Well IF FCA can actually pull engine and ECU data via 3G cellular connection (aka UConnect), then I will sure as ...
I've been losing faith in Tfl. It straying from its original focus into many additional channels...becoming poorer quality in the process.
Well, here is my update after the AEM. I had the procedure completed 06/04/2019. Afterwards, I noticed my MPG had gone down but figured it was because of the re-gen the dealer had to do. The very next day after the procedure, I almost got t-boned when making a u-turn. I stepped on the pedal to accelerate when there was traffic coming due to the fact that I was used to the truck actually hauling ass when I stepped on the pedal. It was one of the worst feelings in the world, sitting in the middle of the road, watching traffic head towards you, and the pedal is dead. Only when I held it down for what seemed about 5 seconds did the turbo spool up and the truck went.
Here we are over two months later and my MPG has gone to crap in the city and the highway. I used to get around 20-22MPG in the city and over 26MPG on the highway. I now get around 16-17 in the city and I'm lucky if I break 22 on the highway. Turbo lag is very significant in the morning but is noticeable all day for me. I will never attempt to make a u-turn or a turn unless there is no traffic coming for quite a distance away. I have made my wife stop using the truck and use our Mazda 3 instead, because she was used to the truck taking off when stepping on the accelerator and now it's a very slow response time. I did the procedure knowing it was optional, knowing that for the amount of compensation there had to be significant drawbacks to it. I didn't want to do the procedure, but due to the fact that I have extended warranty through MOPAR, I didn't want to get denied in the future for an engine issue and have it blamed on not doing the procedure and having to fight an uphill battle.
I find it so unusual that some like myself are experiencing no differences whatsoever, whereas others are having serious issues.
There has got to be a simple answer, but they better figure it out ASAP.
Could it be different trucks with underlying issues?
Driving style? I know if you mash the pedal the truck is detuned. Some drive like this and some don't..
Several people claim to almost get killed when pulling out, etc. Some have no problem. Again is it driving style like if you typically allow a safe distance when pulling out you don't notice the lag and if you typically floor it to get out, it's now not the same?
No doubt the truck is detuned until warmed-up to about 150° F. I had the AEM completed just to try it out and once it was warmed-up I would say it was mostly back to pre AEM with my particular truck.
It's strange how some are having issues others aren't. Talking with my service guy (3 weeks now in the shop) he stated it has been across the board what they have seen due to AEM. They have had some folks never come back others like me stuck in an infinite loop of things bursting. Others they have had to replace the entire engine and more. After the update for me I saw low power and horrible mileage. Was going to take it in but then I had a coolant leak that stems from added pressure after the AEM update.
I find it puzzling that some trucks have no change in performance after the AEM and some do. My truck seemed minimally different post AEM the first couple days, then after a few days it became terribly unresponsive. To the point where i would get honked by drivers behind me at traffic lights when i tried to accelerate and i couldn’t get up to speed at a normal rate. While i was trying to accelerate there would consistently open up about 8-9 car lengths between me and the vehicle that was stopped in front of me at a red light, even when we both take off at the same time. I’m not a lead foot driver at all, i generally give 15-20% accelerator to get moving. 4 way stop signs were embarrassing, i got to where i had to starting letting every once else go first then I would go otherwise i was the @sshole idle-ing through the entire intersection (even with my foot to the floor) making everyone wait and then speeding up as i cleared the intersection. Post AEM my mileage averages dropped to 19.25 mpg from pre AEM 20.5 mpg all hand calculated. As soon as i got my settlement check i ordered GDE hot tune and trans tune. Truck is better that it ever was Pre AEM. But those who are experiencing the performance changes with the AEM shouldn’t have to resort to a tune. FCA needs to find out what’s causing the discrepancies for some of their trucks and fix it.