After replacing a long list of components, this F-150 still bucks like a Bronco when warm.
There is nothing worse than having a problem with your FordF-150 that you cannot diagnose, especially when it affects drivability. F-150 Online forum member Thatsabummer joined the forum to seek help with his 2005 F-150 after making a handful of changes without any improvement. Running out of ideas, he turned to the forum for insight as to where to look next to fix his truck’s bucking issue.
The Introduction
This thread begins with the OP explaining that the engine block in his 2005 Ford F-150 cracked out of warranty, forcing him to have a new engine installed. The new engine went in around 140,000 miles and with 175,000 miles on the ticker, the truck has started to run very poorly when hot.
Problems now:
Bucking!!!
This absolutely only happens when truck is fully warmed up about 30 minutes of driving! Idles fine. No codes ever.
What I have tried:
Fuel filter
FPDM
Coils – all 8
TPS
Throttle body
Transmission speed sensor
I probably missed something. So I’ll let you know as opinions start showing up
What I’m going to do next:
test fuel pressure
So I’ve spent a lot of money on this truck. I need this truck. Thank you all for taking your time out of your schedules to help people out and save us money. This is a really cool site and appreciate people like you guys.
The Community Replies
The first person to reply was “glc”, who offered the following input and a quick question.
There is no test port for fuel pressure. You need a OBD2 scanner that can read the fuel pressure PID.
Did the engine come with new Motorcraft spark plugs? What brand coils did you use?
To which the OP replied with this:
Yes the engine came with Motorcraft everything. And everything I have replaced has been Motorcraft as well. My mechanic was very stern on that. So I listened. I agree on scanner. I’ll need to order one.
After a few replies that didn’t relate to the problem at hand, the OP shared a video of the problem. In the clip below, you can see how the engine speed jumps over and over again while the F-150 is cruising down the road at relatively low rpm.
From there, “ManualF150”posted with the instructions on how to recalibrate the throttle and we have not heard back whether or not this helped the issue, but with any luck, the OP will update the community soon.
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