40 mph studder....
Thread Starter
|
Senior User
Joined: Oct 2010
Posts: 276
Likes: 2
From: Bonita Springs FL
40 mph studder....
I have an 01 4x4 Excursion with the V-10 and 4.30 gears. I have a very wierd issue. Under very specific circumstances at 40 mph, the truck will studder or hiccup. The truck must be slowly accelerateing with VERY light throttle, it must be on level or just slightly inclined road, the truck must have already shifted to 4th gear (around 1800 or less rmp) and going or accelerating thru 40 mph. If any of these perameters are not met the truck accelerates just fine. In fact, other than purposly reprodcing it, in about 2000 miles it has only happend about 3 times.
I purchased the the truck in November and have only put about 2000 miles on it. It has about 148,000 on it now. It appears that the P.O. replaced all of the COPs with new Mastercraft's. I dont know the milage, but it idles a little high (1000 out of gear, 800 in gear) Tranny fluid has not been changed yet by me, but seems clean and to the full mark when hot.....
Any ideas?
Thanks!
I purchased the the truck in November and have only put about 2000 miles on it. It has about 148,000 on it now. It appears that the P.O. replaced all of the COPs with new Mastercraft's. I dont know the milage, but it idles a little high (1000 out of gear, 800 in gear) Tranny fluid has not been changed yet by me, but seems clean and to the full mark when hot.....
Any ideas?
Thanks!
Senior User
Joined: Aug 2004
Posts: 327
Likes: 0
From: Los Angeles
My 2002 F-350 7.3L auto is doing the same thing. Over the past couple months the conditions to cause the studdering have widen. It went from only at 40-45mph to 35-50mph.
Trending Topics
Senior User
Joined: Nov 2010
Posts: 129
Likes: 1
From: Northern NY, 1000 Islands
My 99 has a jerking studder as yours and I think it's the lockout on the torque converter. I'm going to do the transmission flush. Understand that the clutchs build up a glaze and the flush cleans them. Not sure but the pro's here will hopefully join in. Good luck.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
3 Best / 3 Worst Parts of Modern Ford Ownership
Brett Foote
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches
Pouria Savadkouei
Every 2026 Ford Engine Explained
Brett Foote
10 Ugly Ford Trucks That We Still Kinda Love
Joe Kucinski
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
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
Senior User
Joined: Mar 2005
Posts: 173
Likes: 0
From: TX
Me? I'd pull a couple of spark plugs (front and rear, both sides) and look at the electrodes. On the 4.6 (2v and 4v) and 5.4 mod engines I've had, the stumble when accelerating in a high gear has been caused by spark plug erosion. Other friends have vehicles other than Ford and mistook the stumble for transmission issues.
Just my .02.
Just my .02.
Senior User
Joined: Mar 2005
Posts: 173
Likes: 0
From: TX
If you decide the TCC is the way to go (troubleshoot first), here's a link that may help you. Click here; troubleshooting is given in some of the posts, #10 has directions for the R&R of the TCC.
Thread Starter
|
Senior User
Joined: Oct 2010
Posts: 276
Likes: 2
From: Bonita Springs FL
Me? I'd pull a couple of spark plugs (front and rear, both sides) and look at the electrodes. On the 4.6 (2v and 4v) and 5.4 mod engines I've had, the stumble when accelerating in a high gear has been caused by spark plug erosion. Other friends have vehicles other than Ford and mistook the stumble for transmission issues.
Just my .02.
Just my .02.
Thanks for all your help, I am going to trouble shoot the TCC.
WMNY, let me know if the flush helps. If we get a dry day, I will be doing the same...
Junior User
Joined: Mar 2009
Posts: 66
Likes: 0
From: Rochester, MN
This is exactly how it started for me when I had a spark plug issue at ~75K. Remember that high gear with TCC locked at that speed/RPM is the highest load you ever put on the engine. This is where the load is highest in the cylinder and you have the best chance of miss-fire with any kind of ignition malfunction. I pulled the plugs and found one to have enough residue, looked like oil/ash kind of combination to cause the missfire. New plugs and boots fixed it. Check the codes to see if it is setting a missfire code. I never saw one but you never know. Good luck!
Thread
Thread Starter
Forum
Replies
Last Post
malburg2009
Modular V8 (4.6L, 5.4L)
7
Mar 7, 2015 12:14 AM
nascar_20
Explorer, Sport Trac, Mountaineer & Aviator
4
Jul 15, 2014 06:47 AM
