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

25,445

Check fuel pressure

89,935

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.

21,805

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.

15,370

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

F-150

Looking for a Used F-150 in your area?

CarGurus has 204,925 nationwide F-150 listings starting at $1,273.

ZIP:

Search Ford F-150 Questions

Ford F-150 Experts

#1 OJ
OJ
Reputation 6,290
#2 dandyoun
dandyoun
Reputation 3,970
#3 tennisshoes
tennisshoes
Reputation 2,370
View All

Related Models For Sale

Used Chevrolet Silverado 1500
2,639 Great Deals out of 148,664 listings starting at $1,800
Used GMC Sierra 1500
1,149 Great Deals out of 57,873 listings starting at $2,495
Used Dodge Ram 1500
536 Great Deals out of 12,902 listings starting at $1,800
Used Ford F-250 Super Duty
479 Great Deals out of 42,649 listings starting at $2,850
Used Toyota Tundra
663 Great Deals out of 28,152 listings starting at $1,599
Used Toyota Tacoma
757 Great Deals out of 33,289 listings starting at $2,988
Used Ram 1500
1,422 Great Deals out of 114,994 listings starting at $6,999
Used Ford F-250
542 listings starting at $1,977
Used Ford Mustang
678 Great Deals out of 38,414 listings starting at $1,963
Used Nissan Titan
226 Great Deals out of 14,510 listings starting at $4,200
Used Ford Explorer
1,441 Great Deals out of 72,738 listings starting at $985
Used Chevrolet Tahoe
1,075 Great Deals out of 31,905 listings starting at $1,495
Used Ford Ranger
219 Great Deals out of 6,903 listings starting at $1,500
Used Chevrolet Colorado
331 Great Deals out of 16,931 listings starting at $2,195
Used Chevrolet Silverado 2500HD
421 Great Deals out of 28,741 listings starting at $2,295