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

5

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

16,105

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 out of 2 people think this is helpful.
1,195

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

6,525

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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