my 2004 f150 4.6 has acheck engine light on. flashes sometimes while on the highway. I know it missfiring. Considering changing the spark plugs. Any suggestions?

15

Asked by Apr 05, 2017 at 07:46 AM about the 2004 Ford F-150 XLT Ext. Cab

Question type: Maintenance & Repair

2004 F150 xlt triton 4.6

17 Answers

76,355

Yes, a flashing check engine light is a indication of a miss fire, and if not taken care of, can cause damage to the catalytic converter. Spark plugs, and wires are the first thing to look at, then try to isolate the miss, may be a coil, or coil pack that may be bad and can be tested at an auto parts store.

1 of 1 people found this helpful.
15

Thank you. I plan to have the codes checked today and try to determine which one(s) are misfiring.

76,355

That will work!

1 of 1 people found this helpful.
15

Ok, so I changed the number 7 coil. Truck runs great now! Reset the pcm. Ran for almost 500 miles. truck still running great but engine light came back on stating crank sensor. I am going to check the wires first. Any other sugguestions?

76,355

Yes, just check out the wiring, lot of times it is just a bad connection at the plugin. Check the plugin at the cam sensor also, the system is tied together so to speak. Another cause is if the sensor gets too far away from the reluctor due to rust. Just check it out.

1 of 1 people found this helpful.
Best Answer Mark helpful
15

I hope it is that simple. I have heard that changing the crank sensor is a not so easy task. I will take a look at cam sensor wiring as well, that one is easier to get to. Thank you

76,355

Your welcome. If it comes on down to it, the crankshaft sensor can be tested.

15

does it need to be removed prior to testing?

76,355

Yes unfortunately. You run 12 volts threw it and it becomes a magnet.

15

Thanks. Let's hope it just a loose connection or something like that then.

15

Ok. Crank sensor code is gone. Now a new code is up. P0430. The for what could cause this is a long one. Any suggestions on where to start

76,355

If the engine has ben running poorly, a miss fire, this damages the catalytic converters just below the exhaust manifolds. The catalytic converters need to be changed out, especially if you truck needs to pass emissions. P0430 code means that the vehicle's control module has detected that the three-way catalytic converter is not working properly (is not as efficient as the factory is expecting). Replacing the oxygen (O2) sensors may sometimes fix the code, but in most cases the catalytic convert needs to be replaced to fix the problem. If the P0430 code is combined with other codes, try fixing the other codes first. Here is a video to watch on this... https://youtu.be/xLyytQD7njw

15

I am eligible to get truck tags in my state. With these emissions is not required. I may do that until I can get enough together for a new catalytic converter

15

There are no other codes at this time

76,355

Sure. It would be fine. The cats are spendy.

15

Would I need to replace both or just the one on the side that the misfire was on?

76,355

I am not sure if the "Y" pipe is two piece or not. They say cats last up to 150,000 miles, you may want to replace the upper two cats. Check with an exhaust shop on this one.

Your Answer

F-150

Looking for a Used F-150 in your area?

CarGurus has 224,490 nationwide F-150 listings starting at $1,200.

ZIP:

Ford F-150 Experts

  • #1
    OJ
    Reputation
    9,470
  • #2
    dandyoun
    Reputation
    4,650
  • #3
    tennisshoes
    Reputation
    3,270
View All

Related Models For Sale

Used Chevrolet Silverado 1500
2,747 Great Deals out of 175,329 listings starting at $955
Used GMC Sierra 1500
1,227 Great Deals out of 64,898 listings starting at $999
Used Ford F-250 Super Duty
448 Great Deals out of 49,397 listings starting at $1,899
Used Toyota Tundra
701 Great Deals out of 34,374 listings starting at $1,500
Used Dodge Ram 1500
412 Great Deals out of 11,096 listings starting at $1,500
Used Toyota Tacoma
724 Great Deals out of 45,869 listings starting at $2,500
Used Ford F-350 Super Duty
383 Great Deals out of 27,231 listings starting at $3,000
Used Ford Mustang
600 Great Deals out of 39,959 listings starting at $1,895
Used Chevrolet Silverado 2500HD
393 Great Deals out of 30,738 listings starting at $1,995
Used Nissan Titan
284 Great Deals out of 17,826 listings starting at $3,500
Used Chevrolet Tahoe
829 Great Deals out of 42,143 listings starting at $1,987
Used Chevrolet Colorado
344 Great Deals out of 38,619 listings starting at $1,595
Used Ford Explorer
1,265 Great Deals out of 70,145 listings starting at $1,000

Used Cars For Sale

2018 Ford F-150 For Sale
13 Great Deals out of 121,532 listings starting at $20,313
2017 Ford F-150 For Sale
199 Great Deals out of 27,290 listings starting at $17,298
2016 Ford F-150 For Sale
219 Great Deals out of 7,860 listings starting at $15,552
2015 Ford F-150 For Sale
522 Great Deals out of 11,426 listings starting at $11,990
2014 Ford F-150 For Sale
762 Great Deals out of 15,430 listings starting at $9,990

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.