2004 - 2008 F-150

I will not give up!

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Old 08-06-2018, 02:19 PM
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I will not give up!

Hi everyone, fresh and new to here. I have gained a ton of information on this site the past 2 yrs when I bought my first ford. So thanks to all of you. Hate to say it but it’s been a bad experience so far.
Bought 05 Ford F-150 5.4 with 135,000 miles. Warranty ran out. Then got a cracked block. I’m past that part so let’s not talk about it. Never figured out why anyways. So new motor at 140,000 miles. Purchased from Colt Powertrain with the engine install kit. Truck now has 175,000 miles.
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
tbrottle 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 ppl out and save us money. This is a really cool site and appreciate ppl like you guys.
 

Last edited by Thatsabummer; 08-06-2018 at 02:25 PM. Reason: Adding information
  #2  
Old 08-06-2018, 04:38 PM
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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?
 
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Old 08-06-2018, 04:56 PM
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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.
 
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Old 08-06-2018, 05:19 PM
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5.4 3v jumped time

hi this is my first time on here I have set my time but all new timing parts and I've done it the right way and it jumps time on me this is the third time I took it apart and reset the time and does anybody know why it jumps time
 
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Old 08-06-2018, 05:56 PM
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Originally Posted by Ralph Reynolds
hi this is my first time on here I have set my time but all new timing parts and I've done it the right way and it jumps time on me this is the third time I took it apart and reset the time and does anybody know why it jumps time
Ralph, start your own thread.
 
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Old 08-12-2018, 08:46 PM
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Here is a short video showing how the rpm’s just bounce all back and forth.
 
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Old 08-12-2018, 08:47 PM
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Originally Posted by Thatsabummer
Here is a short video showing how the rpm’s just bounce all back and forth.
Where's the video?
 
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Old 08-19-2018, 02:26 PM
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For some reason I can’t upload it. And it’s ably like 17 seconds long
 
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Old 08-19-2018, 03:13 PM
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Why not open a Youtube account and post it publicly on there, then share the link?
 
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Old 08-19-2018, 03:19 PM
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Old 08-19-2018, 03:20 PM
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Originally Posted by ManualF150
Why not open a Youtube account and post it publicly on there, then share the link?
thanks manual lol I should have known 😂
 
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Old 08-19-2018, 09:23 PM
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Put the key in the Ignition and turn the key to the ON position, do not start the vehicle, now with the key in the ON position press the gas pedal to the floor very slowly once it bottoms out let off the pedal guickly, turn ignition to OFF and repeat these step two more times......now start your vehicle and go for a ride, report back if their is any good changes to your problem...
 
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Old 08-19-2018, 10:01 PM
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Originally Posted by ManualF150
Put the key in the Ignition and turn the key to the ON position, do not start the vehicle, now with the key in the ON position press the gas pedal to the floor very slowly once it bottoms out let off the pedal guickly, turn ignition to OFF and repeat these step two more times......now start your vehicle and go for a ride, report back if their is any good changes to your problem...
thanks for your reply. I have tried that about 5 times in the past 2 months. Someone posted that in a different forum. I can’t remember what that is really suppose to do for the truck? Relearn? I am either doing it wrong or it’s just not working for what’s wrong with my truck.
 



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