Spark plugs


Asked by May 13, 2013 at 07:38 AM about the Ford F-150

Question type: Maintenance & Repair

I have a 2003 Ford F150 5.4 liter engine v8, was driving and it just died on me and wont fire, I have checked the spark plugs and know they need to be replaced, if replaced and still wont fire what else could be wrong?

4 Answers


Check fuel pressure


Bad plugs will not shut the engine down. All eight of them are not going to stop firing at the same time. Try some starting fluid to see if you need ignition or fuel.

Tracy Hooks

GOD NO! DON'T USE STARTING FLUID! Don't use anything Ether based at least! Dangerous stuff. Remember the fire triangle: Fuel, air, heat. Without one of these, the engine won't run. Carburetor sprays will generally start and run an engine for a moment indicating a lack of fuel. Just unplug a vacuum line at the intake manifold, using the straw, spray into the port for about 2 seconds, replace the vacuum line and attempt to start. If it tries to run, you have a fuel delivery concern. Your Ford is equipped with a fuel shut-off (Impact) switch. Check that switch first if you're not getting any fuel. There are also relays and fuses involved. Your spark plugs are fired by individual coils that are directly controlled by the PCM. Even completely worn plugs will fire.


Spark plugs will not go out all at once, so your problem is not there. Your problem is either with fuel delivery or spark getting to the plug. Even a gummed up air filter will not cause the engine to die. Lacking the proper equipment to test if spark it getting to the plug is possible. It involved a 3 penny nail and the exhaust manifold. If you don't know how to accomplish it, I will not add any further suggestions. But your problems does seem to be electrical/electronic.

Your Answer

Add photo

Related Questions

  • Spark plug diagram 2 answers

    Wiring diagram for spark plugs

    1993 Ford F-150


    Maintenance & Repair

  • What's spark plugs to use 9 answers

    Hey guys what would be the most fuel efficiency spark plug to use in a 2005 ford expedition 5.4l

    2005 Ford F-150


    Maintenance & Repair

  • Replace spark plugs f150 1993 4.9L in-lin 6 2 answers

    Any suggestions for replacing spark plugs?

    1993 Ford F-150 XL LB


    Maintenance & Repair

  • Why is there no spark? 2 answers

    I have spark from coil to the distributor, but there is no spark going to the plugs.

    1979 Ford F-150


    Maintenance & Repair

  • where are the spark plugs 14 answers

    where are how do you change the spark plugs in the expedition

    2001 Ford Expedition


    Maintenance & Repair


Looking for a Used F-150 in your area?

CarGurus has 217,212 nationwide F-150 listings starting at $1,000.


Search Ford F-150 Questions

Ford F-150 Experts

#1 OJ
Reputation 6,000
#2 dandyoun
Reputation 3,880
#3 tennisshoes
Reputation 2,300
View All

Related Models For Sale

Used Chevrolet Silverado 1500"
2,470 Great Deals out of 144,754 listings starting at $1,995
Used GMC Sierra 1500"
1,047 Great Deals out of 56,521 listings starting at $2,300
Used Dodge Ram 1500"
525 Great Deals out of 13,942 listings starting at $995
Used Ford F-250 Super Duty"
450 Great Deals out of 42,953 listings starting at $1,000
Used Toyota Tundra"
629 Great Deals out of 26,721 listings starting at $2,500
Used Toyota Tacoma"
640 Great Deals out of 30,628 listings starting at $2,850
Used Ram 1500"
1,330 Great Deals out of 111,766 listings starting at $7,995
Used Ford F-250"
614 listings starting at $3,995
Used Ford Mustang"
728 Great Deals out of 41,499 listings starting at $900
Used Nissan Titan"
220 Great Deals out of 13,192 listings starting at $4,500
Used Ford Ranger"
266 Great Deals out of 7,818 listings starting at $988
Used Ford Explorer"
1,361 Great Deals out of 72,128 listings starting at $300
Used Chevrolet Tahoe"
1,147 Great Deals out of 36,615 listings starting at $1,995
Used Chevrolet Colorado"
329 Great Deals out of 17,759 listings starting at $2,495
Used Nissan Frontier"
451 Great Deals out of 20,761 listings starting at $2,500