2003 Ford F150 Knock v8 5.4l....can this be caused from fuel injectors


Asked by Sep 13, 2016 at 11:10 PM about the 2003 Ford F-150 XL Extended Cab 4WD SB

Question type: Maintenance & Repair

My fuel pump is less than a year old, I have changed the spark plugs and
all the coils, the air filter, PCV valve, recently along with an oil change.
Before changing the oil, I put i cup of kerosene in the oil and ran the truck
for appx 40 miles, than immediately changed the oil. I have also added
seafoam to my fuel.  All of these things have made a huge difference in
how it runs and my gas mileage has increased 4.5 mpg. I have a knocking
sound that is only heard when the accelerator is pushed. There is no
knocking when the truck is idling. As I push the accelerator the knocking will
increase. I would greatly appreciate any information. I read some on the
knock sensor and noisy lifters, after listening to some videos online, I do
not believe it is a lifter, but I am not a professional. I believe my engine is
strong and have been told by a neighboring mechanic that is sounds good.
Any ideas?

3 Answers


Still could be a lifter, or a rod, if you get it checked out soon it may could be repaired without rebuilding the entire motor.

2 of 2 people found this helpful.

I agree with enginecreator. Have it check and don't take chances or keep throwing parts at your truck. good luck :-)


Do an oil pressure test first when cold and see if it drops as it heats up to normal operating temperature and see if noise increases as it heats up

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