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

11,510

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.
1,155

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

5,785

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

Your Answer

Add photo

Related Questions

  • 2001 ford tritan v8 1 answer

    What to check on Ford F-150 5.4l v8 4x4 if you changed fuel filter and will crank but not start and start if you use staring fluid in the carbarator

    2001 Ford F-150

    -

    Maintenance & Repair

  • Ford F150 knocks and misfires bad all of the sudden 10 answers

    The day before the truck ran fine.The next morning It was knocking and running on what sounded like 3 or 4 cylinders.I took it to the local Ford dealer and paid 70 bucks to have it hooked to their dia...

    2000 Ford F-150 XL Extended Cab SB

    -

    Maintenance & Repair

  • 2003 F150 Trouble starting 4 answers

    My 2003 F150 4.6L has been having trouble starting the past couple weeks. It cranks nice and hard and usually starts but every once in a while it takes a couple tries (only in the mornings or after...

    2003 Ford F-150 XL Extended Cab 4WD SB

    -

    Maintenance & Repair

  • 1998 f150 v8 truck turns over but will not start. what's wrong? 2 answers

    1998 F150 will not start unless I pour gas straight into fuel injectors.

    1998 Ford F-150 Lariat LB

    -

    Maintenance & Repair

  • What size fuel injector would I need? 5 answers

    I put a volant cold air intake with a bbk 80mm throttlebody on my stock 05 f150 5.4l. Wondering aproximately what cc injector I should install to properly adjust the air/fuel ratio?

    2005 Ford F-150 XLT SuperCab 4WD

    -

    Car Customization

F-150

Looking for a Used F-150 in your area?

CarGurus has 212,369 nationwide F-150 listings starting at $1,000.

ZIP:

Search Ford F-150 Questions

Ford F-150 Experts

#1 OJ
OJ
Reputation 6,970
#2 dandyoun
dandyoun
Reputation 4,180
#3 tennisshoes
tennisshoes
Reputation 2,510
View All

Related Models For Sale

Used Chevrolet Silverado 1500
2,283 Great Deals out of 155,210 listings starting at $1,395
Used GMC Sierra 1500
938 Great Deals out of 62,237 listings starting at $1,395
Used Dodge Ram 1500
528 Great Deals out of 12,814 listings starting at $1,995
Used Ford F-250 Super Duty
397 Great Deals out of 45,071 listings starting at $2,000
Used Toyota Tundra
587 Great Deals out of 30,722 listings starting at $2,637
Used Toyota Tacoma
612 Great Deals out of 35,096 listings starting at $2,155
Used Ford Mustang
363 Great Deals out of 44,352 listings starting at $1,000
Used Nissan Titan
221 Great Deals out of 16,963 listings starting at $3,999
Used Ford Explorer
940 Great Deals out of 73,742 listings starting at $750
Used Chevrolet Tahoe
775 Great Deals out of 28,432 listings starting at $1,500
Used Chevrolet Colorado
263 Great Deals out of 19,394 listings starting at $1,995
Used Ford Ranger
203 Great Deals out of 6,718 listings starting at $1,450
Used Jeep Wrangler
392 Great Deals out of 19,082 listings starting at $3,000

Used Cars For Sale

2017 Ford F-150 For Sale
4 Great Deals out of 102,651 listings starting at $18,199
2016 Ford F-150 For Sale
156 Great Deals out of 41,669 listings starting at $16,995
2015 Ford F-150 For Sale
195 Great Deals out of 7,254 listings starting at $17,480
2014 Ford F-150 For Sale
432 Great Deals out of 11,760 listings starting at $10,700