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

27,255

Check fuel pressure

97,155

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.

24,245

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.

18,340

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

  • Spark going to plugs 1 answer

    I put new coil new cap rotor and still no spark

    1993 Ford F-150 XL 4WD Extended Cab SB

    -

    General

F-150

Looking for a Used F-150 in your area?

CarGurus has 206,316 nationwide F-150 listings starting at $1,499.

ZIP:

Search Ford F-150 Questions

Ford F-150 Experts

#1 OJ
OJ
Reputation 7,940
#2 dandyoun
dandyoun
Reputation 4,360
#3 tennisshoes
tennisshoes
Reputation 2,790
View All

Related Models For Sale

Used Chevrolet Silverado 1500
1,718 Great Deals out of 175,751 listings starting at $1,250
Used GMC Sierra 1500
822 Great Deals out of 68,199 listings starting at $2,484
Used Dodge Ram 1500
453 Great Deals out of 11,151 listings starting at $700
Used Ford F-250 Super Duty
346 Great Deals out of 46,938 listings starting at $1,895
Used Toyota Tundra
443 Great Deals out of 34,312 listings starting at $2,700
Used Toyota Tacoma
544 Great Deals out of 40,814 listings starting at $2,495
Used Ram 1500
925 Great Deals out of 113,958 listings starting at $6,386
Used Ford Mustang
472 Great Deals out of 45,735 listings starting at $1,999
Used Ford F-250
481 listings starting at $3,475
Used Nissan Titan
170 Great Deals out of 19,555 listings starting at $3,000
Used Chevrolet Colorado
217 Great Deals out of 24,313 listings starting at $2,495
Used Ford Explorer
944 Great Deals out of 72,519 listings starting at $1,000
Used Chevrolet Tahoe
550 Great Deals out of 29,235 listings starting at $1,699
Used Ford Ranger
197 Great Deals out of 5,805 listings starting at $1,650
Used Jeep Wrangler
277 Great Deals out of 18,163 listings starting at $2,950

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.