Coil or transmission ???
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Senior User
Joined: Jan 2011
Posts: 130
Likes: 3
From: Dyersburg, Tennessee
Coil or transmission ???
2007 F 150 5.4 has 160,000 miles. I serviced transmission at 80,000. no issues then, just did it. Changed plugs at 110,000.
yesterday truck started 'bucking" on incline at about 40 mph. put it in neutral - rev it up - no problem. kind of feels like a flat tire. Just checked transmission fluid. looks good and clean and at full mark.
let me hear from you - do you think a coil could cause this and it is actually missing or start by serviceing tranny?
thanks in advance
yesterday truck started 'bucking" on incline at about 40 mph. put it in neutral - rev it up - no problem. kind of feels like a flat tire. Just checked transmission fluid. looks good and clean and at full mark.
let me hear from you - do you think a coil could cause this and it is actually missing or start by serviceing tranny?
thanks in advance
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,717
Likes: 2,643
From: SE Florida
It's not hard to figure out which one, and it's really easy to change most of the coils. The back ones are a bit hard to get to.
Get a new coil. Replace one and drive it. If the problem is still there, that wasn't the bad one. Reinstall the original and go to the next cylinder.
If you have access to a good scan tool you can look at the misfire counter and it should show you which coil is the problem. A dealer could do this, and so could any good independent shop.
Get a new coil. Replace one and drive it. If the problem is still there, that wasn't the bad one. Reinstall the original and go to the next cylinder.
If you have access to a good scan tool you can look at the misfire counter and it should show you which coil is the problem. A dealer could do this, and so could any good independent shop.
Tuned
Joined: Aug 2007
Posts: 492
Likes: 0
From: Louisville
Does the truck only do this while in 4th gear (OD) ? If so, it could be the tourqe converter going out. Next time you go up a hill and this happens, hit the O/D button to pop the transmission out of O/D and see if the "bucking" goes away.
Also if one of your COPS or spark plugs were bad, I would think you would have the check engine light on or you would also notice the problem when you rev up the engine while out of gear. You can have someone at a Autozone or similar shop get any codes that your truck may have.
Also if one of your COPS or spark plugs were bad, I would think you would have the check engine light on or you would also notice the problem when you rev up the engine while out of gear. You can have someone at a Autozone or similar shop get any codes that your truck may have.
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,717
Likes: 2,643
From: SE Florida
It's not the torque converter. Turning off the OD will change the speed/load condition on the engine. At higher RPM and lower load misfire is much less likely, so that test will always imply the trans is the problem. It is NOT the problem, it's one or more of the coils.
You won't get a check engine light until the misfire is all the time. The light usually won't come on for low level misfire, which is the problem here.
Misfire is never apparent when revving the engine in park or nuetral. It needs load to be noticed. That's why it almost always shows up in overdrive with the torque converter locked.
Autozone will be able to clear any pending codes that may be there while telling you there are no codes. Unless the check engine light is on they always say there are no codes.
You won't get a check engine light until the misfire is all the time. The light usually won't come on for low level misfire, which is the problem here.
Misfire is never apparent when revving the engine in park or nuetral. It needs load to be noticed. That's why it almost always shows up in overdrive with the torque converter locked.
Autozone will be able to clear any pending codes that may be there while telling you there are no codes. Unless the check engine light is on they always say there are no codes.
Junior User
Joined: Aug 2008
Posts: 80
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I had same symptoms, bucking and misfire under load. Most of the time, no light. One time, I kept the gas floored and the check engine light started blinking, but as soon as I let off it went away. No codes on computer. Dealer warmed up and tested under load with real-time monitoring of computer and got misfire codes. They charged me $80 to tell me I needed new spark plugs (this is at 50k miles) and a new catalytic converter, which they said was partially plugged. They covered the converter under emissions warranty (the truck is an 05) and my brother in law did the plugs. Problem gone.
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Elder User
Joined: Jan 2007
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Posted this to another thread too. I have been chasing a front end vibration that on the surface would seem to be a tire balance issue, however, I have had them balanced and rotated a few times to no avail. They are Michelin AT/2 tires that were smooth as glass at initial installation. The problem seems worse at times and disappears altogether sometimes. Could this possibly be related to a coil problem causing engine misfire/vibration do you think? Have also wondered about a wheel or drivetrain bearing going bad. Had the driver side hub assembly go bad on me once, but I do not remember a vibration just increasednoise.
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New User
Joined: Mar 2011
Posts: 16
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From: Pilot Point, TX
I recently bought an '04 F150 4X4 5.4 w/186k on it. Very clean and well maintained 1 owner. I have started having this same issue the last few days. In the 45 to 60 mph range cruising along and hit a hill or try to speed up and get the same symptoms. I was thinking missfire but figured cel would come on. Think I will look into plugs, which I have no idea how many miles they have, and checking for a bad coil.
New User
Joined: Mar 2011
Posts: 16
Likes: 0
From: Pilot Point, TX
I had just replaced a bad actuator (actuator was stuck in disengaged position and would not engage.) on the passenger side when this started happening and was thinking maybe something in the 4 wheel drive system was causing it. Like I always do tho I came to the right place and started reading. Love the info on this site! Got me thinking... Have an '01 F150 that did the same thing around the same mileage mark and the engine light didn't come on then either. Found out the plugs were original and after replacing them it ran like a champ and had a LOT more power. I know exactly were I'll be starting at now
New User
Joined: Feb 2006
Posts: 13
Likes: 0
I had just replaced a bad actuator (actuator was stuck in disengaged position and would not engage.) on the passenger side when this started happening and was thinking maybe something in the 4 wheel drive system was causing it. Like I always do tho I came to the right place and started reading. Love the info on this site! Got me thinking... Have an '01 F150 that did the same thing around the same mileage mark and the engine light didn't come on then either. Found out the plugs were original and after replacing them it ran like a champ and had a LOT more power. I know exactly were I'll be starting at now
I have the same exact problem. What actuator did you replace? Thanks.
New User
Joined: Mar 2011
Posts: 16
Likes: 0
From: Pilot Point, TX
I had replaced the actuators at the wheels for the 4 wheel drive system. They are the parts that engage/disengage the front wheels. Not sure if that is thesame problem you are refering to. The missfire type problem I had ended up being one of the coil on plug which I replaced and that fixed my issue.
Senior User
Joined: Jun 2004
Posts: 133
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i had the actuators go in mine too, and also had the highway speed stumble. ford tech sat in it for 5 minutes and could hear the miss, said water ruined a coil. ( my engine was recently shampoo'd).
3 other mechanics either said tranny or "gotta wait till theres a code". the best one was "the computer will just recalibrate itself, it should go away on it's own" - ha ha ha that one was classic .....
check those coils ....
3 other mechanics either said tranny or "gotta wait till theres a code". the best one was "the computer will just recalibrate itself, it should go away on it's own" - ha ha ha that one was classic .....
check those coils ....
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