Locking out 3rd, truck accelerats after shift
Thread Starter
|
Mountain Pass
Joined: Jul 2014
Posts: 140
Likes: 49
From: Eastern Panhandle of WV
Locking out 3rd, truck accelerats after shift
Drifting down a long forest service road, at about 15 mph in 3rd, I lock out 3rd to slow down. The truck downshifts and accelerates to about 25 mph, before the engine compression slowly drops the speed. This is repeatable over the course of several months. The truck is a 2022, F250, 4X4, 7.3, 10 speed, 4.30 rears, with camper/snowplow packages. I did not check the transmission in manual yet, next trip.
Not what I want the truck to do. Is this normal for the beast, or does it need a re-flash?
Not what I want the truck to do. Is this normal for the beast, or does it need a re-flash?
Fleet Mechanic
Joined: Dec 2021
Posts: 1,735
Likes: 1,116
All four of mine do it 6R100 does it in 2nd gear often and 10R140 does it in 2nd and 3rd gear. If I know im going to downshift above 2500rpm I just apply the brakes at the same time so it doesn't run away before it engages the lower gear.
Laughing Gas
Joined: Dec 2021
Posts: 1,091
Likes: 343
From: PG, BC, Canada
Another thing mine does is when going down hills, and the cruse is set, it starts to hold back the truck, witch is fine, 
But at the bottom when it no longer needs to hold the truck back it doesn't shift up, it adds gas and keeps the lowest gear it got down to, then adds more gas and finally, after way too long of holding that gear it shifts up... annoying, it's like the TCM locked out the gears on it's own... 
But at the bottom when it no longer needs to hold the truck back it doesn't shift up, it adds gas and keeps the lowest gear it got down to, then adds more gas and finally, after way too long of holding that gear it shifts up... annoying, it's like the TCM locked out the gears on it's own...
Hotshot
Joined: Jun 2003
Posts: 12,341
Likes: 4,366
From: SW VA
When decelerating, engines usually run pretty lean. Maybe the engine is adding a little fuel to help prevent a too-lean situation.
What I hate, is when my truck isn't quite warmed up, I can manually drop down to 2nd gear at 40mph and my truck will accelerate faster. RPM's over 3000, foot off the gas pedal, and the truck speeds up. Stupid *** emissions...
What I hate, is when my truck isn't quite warmed up, I can manually drop down to 2nd gear at 40mph and my truck will accelerate faster. RPM's over 3000, foot off the gas pedal, and the truck speeds up. Stupid *** emissions...
Mountain Pass
Joined: Mar 2010
Posts: 183
Likes: 27
From: Northern CA
Mine does the same as the OP's. It goes way beyond rev matching. The truck accelerates not just the engine. To make it more confusing it doesn't do it when in the Tow Haul mode.
Mine also gets hung up in lower gear it dropped down to at the end of a grade and doesn't want to upshift. Most time I have to shift to M and get it out of that gear.
Doesn't seem right.
Mine also gets hung up in lower gear it dropped down to at the end of a grade and doesn't want to upshift. Most time I have to shift to M and get it out of that gear.
Doesn't seem right.
Trending Topics
Laughing Gas
Joined: Dec 2021
Posts: 1,091
Likes: 343
From: PG, BC, Canada
Mine does the same as the OP's. It goes way beyond rev matching. The truck accelerates not just the engine. To make it more confusing it doesn't do it when in the Tow Haul mode.
Mine also gets hung up in lower gear it dropped down to at the end of a grade and doesn't want to upshift. Most time I have to shift to M and get it out of that gear.
Doesn't seem right.
Mine also gets hung up in lower gear it dropped down to at the end of a grade and doesn't want to upshift. Most time I have to shift to M and get it out of that gear.
Doesn't seem right.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
Thread
Thread Starter
Forum
Replies
Last Post
old-rodder
Pre-Power Stroke Diesel (7.3L IDI & 6.9L)
8
Oct 7, 2011 11:51 AM