HardcoreFx4

Ok I just bought my 2004 f150 fx4 with the 5.4 triton. And when I was driving it about 55 60 it feels like your hitting a bump but doesnt do it all the time just every once in a while. And you can get on it and it doesnt do it just everyonce in a while when your going that speed and give it gas at that speed. So what im wanting to no is what could be the problem thanks for any help.

lariatboy

Plugs, COP's, FPDM. Check those first.

Kulstad

I've gone through exactly what you describe in my 07SCrew. Here's my thread on it

https://www.f150forum.com/f4/fuel-pu...ummary-130650/

I'm getting her out of the shop today. According to the mechanic, it's a fuel pump issue.


Side-note: there seems to be quite a lot of people having this issue.

JarreT329

ive had that problem, i changed my spark plugs and its been running fine ever since

james2042

I had that problem after my water pump locked up,broke my belt and the belt broke the cam sensor plug on the left side. Fixed the plug and it went away. Maybe the plug is loose? Good Luck hope you get it fixed.

sargeek1975

Plugs...........