Jerking/Lunging During Acceleration
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Joined: May 2017
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Jerking/Lunging During Acceleration
I have a 2011 F250 Lariat, 6.2L V8. The past couple months i have noticed truck jerking/lunging during acceleration in the mornings usually between leaving the house and getting on the highway. Over the last 2 weeks the problem has progressed and seems to last longer. I have tried fuel injector cleaner with no success. This morning was the worst so far and after all this time i finally saw the maintenance "wrench" pop up on the on dash. This was good news to me hoping that a local shop could read the code. However, when i dropped off my daughter and started back up the "wrench" went away. After warming up the problem seems to go away. This morning was so severe i lost speed and felt like the engine was going to stall.
I feel like this is related to the fuel system (injectors/pump/filter) but also haven't changed the spark plugs yet. My truck has 72,000 miles and otherwise is in good shape.
Any thoughts on how i should move forward?
I feel like this is related to the fuel system (injectors/pump/filter) but also haven't changed the spark plugs yet. My truck has 72,000 miles and otherwise is in good shape.
Any thoughts on how i should move forward?
Fleet Mechanic
Joined: Feb 2011
Posts: 1,812
Likes: 88
From: Thousand Oaks, CA
There are other tools available for under $40 that will provide access to pending data such as - BAFX Products 34t5 Bluetooth OBDII Scan Tool for Android $22 and Torque Pro software $4.99.
Logistics Pro
Joined: Nov 2004
Posts: 4,795
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I've got a 2011 F350 6.2l with about 92,000 miles on it. Still have the original plugs in it; no issues.
I'd think if you had a bad plug or something like that, that you'd have the problems more consistently.
I'd just take it to the dealer. They'll read the stored codes and tell you what it could be before doing any work.
I'd think if you had a bad plug or something like that, that you'd have the problems more consistently.
I'd just take it to the dealer. They'll read the stored codes and tell you what it could be before doing any work.
Logistics Pro
Joined: Nov 2004
Posts: 4,795
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Just curious - does it seem like it happens when it goes into 3rd (now that you know that may be the problem)?
if you have the manual shifting option on your truck, see if manually shifting results in the same problem.
Is your transmission fluid full?
if you have the manual shifting option on your truck, see if manually shifting results in the same problem.
Is your transmission fluid full?
FTE Leadership Emeritus
Joined: Sep 2000
Posts: 23,174
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From: Stephensville WI
IIRC, the code was set because the compter expected to see a known ratio between the input shaft and the output shaft after 3rd gear was selected. In other words, it saw a ratio other than 3rd gear.
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Mountain Pass
Joined: Oct 2016
Posts: 134
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had you replaced your filter/fluid sometime just before you were noticing this?. .I started having issues with slams and wierd down shifts and at tines it felt like the backend just hit a log. What happen isbi used a fully synthetic transmission fluid that was supposedly compatible. said so on the label. But i looked on the forum and found others that had issues with non motorcraft fluid. So i went down bought like 8qts of motorcraft transmission fluid from the ford dealer and problems went away and haven't come back over 6 months later.
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Mountain Pass
Joined: Oct 2016
Posts: 134
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mine surges at initial acceleration, its the throttle body plate, worn out, its just over a hundred and change to replace the throttle body if i remember right. i personally have just learned to live with it. I had even replaced the TPS but that did nothing but waste money.
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