Shuddering problem
Thread Starter
Ford Enthusiast
Joined: Aug 2011
Posts: 897
Likes: 19
From: Cincinnati, Ohio
Shuddering problem
Ok so I bought a 04 f150 xlt SCrew the other day and during the test drive every thing was fine on my way home (a few hundred miles) the truck started shuddering under normal acceleration around the 55-75 speed range. Normal acceleration up to that is fine and if you mash the pedal to the floor she takes off like a bat outta hell. Its only normal acceleration in those ranges. I've been told that it is the fuel filter, ignition system (plu gs and wires), or the torque converter????? Anyone have any wisdom for this issue???i font want to have to put money in it after just buying it but I'm scared to drive it any more like this!
Truck has 112k and was a repo so I have no history on it
Truck has 112k and was a repo so I have no history on it
Senior Member
Joined: Jul 2011
Posts: 580
Likes: 5
From: PA
Change fuel filter, ari filter and clean throttle body and 9 times out of 10 it will fix it. But if not hook it up and see if you got a bad coil pack. Usually when they go bad though they shudder all the time
Thread Starter
Ford Enthusiast
Joined: Aug 2011
Posts: 897
Likes: 19
From: Cincinnati, Ohio
It did pop a few cel's after a few hundred miles but the lights went away and have not come back but the problem is still happening. The codes it threw were
P0174
P0303
C1484
P0300
P0174
P0303
C1484
P0300
Ryan
Joined: Apr 2011
Posts: 1,208
Likes: 82
From: Winston-Salem, NC
My '06 5.4 did the same thing when i bought it. Took it back to the dealer i bought it from and they checked it over, wasn't a fuel issue, they pressure tested it and found the cats were plugged up. They had Ford put two new cats on it, changed the plugs, and now she runs like a champ!
Senior Member
Joined: May 2009
Posts: 730
Likes: 4
From: Elmhurst, IL
I would change the plugs. If it hasn't been done then it's over due. If it was done at the right interval then it's getting close anyways. If it continues then I would switch COP #3 with another cylinder and see if the problem follows the COP.
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Senior Member
Joined: May 2009
Posts: 730
Likes: 4
From: Elmhurst, IL
C is a chassis code but can't seem to find much about them in my documentation. I wouldn't be too concerned with it yet. Take care of the misfire codes first which will probably take care of the p0174. If you want to try something quick just replace the COP on the no 3 cylinder and do a plug change in the near future.