engine misfires under load w/401 code
Thread Starter
|
New User
Joined: Aug 2009
Posts: 2
Likes: 0
engine misfires under load w/401 code
When in overdrive engine misfires or hesitates at 45 mph when under a load as going up a steep hill. Replace EGR and checked the dpfe sensor hoses and they aren't plugged. Any other ideas?
Senior User
Joined: Nov 2004
Posts: 357
Likes: 0
From: Lancaster, PA
You are not giving me enough information. does the truck downshift (Assuming its auto), does the o/d light flash, is the check engine light on steady or flashing, what codes have you found, does it happen consistently or intermittent, do you have your foot on the floor or are you easing into it, does weather or temperature have an effect? I can help you if you can give me some basic info.
Thread Starter
|
New User
Joined: Aug 2009
Posts: 2
Likes: 0
You are not giving me enough information. does the truck downshift (Assuming its auto), does the o/d light flash, is the check engine light on steady or flashing, what codes have you found, does it happen consistently or intermittent, do you have your foot on the floor or are you easing into it, does weather or temperature have an effect? I can help you if you can give me some basic info.
Happens consistantly. Easing on the accelerator to maintain speed. Truck does NOT downshift as this occurs. The check engine light is on steady. The only code to show is the 0401. Weather or temp seems to have no effect. Replaced the EGR valve position sensor and the code has not reappeared but the problem persists.
Hotshot
Joined: Jan 2004
Posts: 19,768
Likes: 1,082
From: St Louis
Happens consistantly. Easing on the accelerator to maintain speed. Truck does NOT downshift as this occurs. The check engine light is on steady. The only code to show is the 0401. Weather or temp seems to have no effect. Replaced the EGR valve position sensor and the code has not reappeared but the problem persists.
Elder User
Joined: Mar 2007
Posts: 695
Likes: 4
I had the same problem at one point and it turned out to be cracked porcelen on one of the new plugs I put in the truck. My miss didn't throw a ck engine light. Sounds like it is time for a good tune up!!
Trending Topics
Junior User
Joined: May 2009
Posts: 75
Likes: 0
My truck is doing the same thing. I changed the plugs a few months or so ago and fixed the problem. Last week it started doing it again. I changed the plugs again. Yesterday the ck engine light started flashing so i scanned it and got the 401 code again. In the boot of spark plug wire #4 there is some light grey lines where it looks like it could be arcing out. Once i change these ill let you know how it runs, this could be your problem as well.
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
Laughing Gas
Joined: Oct 2003
Posts: 967
Likes: 0
From: DC
What kind of plugs are you using?
Thread
Thread Starter
Forum
Replies
Last Post
D. Shannon Rainwater
Modular V8 (4.6L, 5.4L)
2
Nov 23, 2015 08:35 AM
09dinger
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
2
Oct 2, 2014 07:33 AM
