Forum Discussion

Grit_dog's avatar
Grit_dog
Navigator II
Jun 10, 2019

Ford Triton Engine Spark Plugs PSA

While Ford is well known for spitting spark plugs, the ones that don't are the ones that tend to break on removal.
04-08 I believe, the super long 2 piece sparkplugs were used in the 3V heads (maybe others).
Having just bought a Mustang GT that is a sticker, not a spitter, I decided to change plugs now with low miles (35kmiles) than procrastinate.
Got all of them out no problem, no oil needed, but even at such low miles on a car that is basically in new condition, every plug was very corroded in the hole and required working back and forth a bit and they all squealed the whole way out.

If you have one of these, the plugs rusting (no carbon on mine, just rust) in is a real concern. Assuming a linear rate of corrosion or carbon vs hours/miles, and how hard these were to remove, I'd estimate by 100k miles, you have a 100% chance of breaking some unless you spend the time and work and lube them, which takes days, not hours.

18 Replies

  • Me Again wrote:
    Sportsmen wrote:
    I have had three 5.4L engines. A '97 2v an 06 3V and an 07 3V. I never had a plug problem with any of them. I always had them changed at the dealer and had "0" problems with any of those three engines...


    Maybe they heli-coiled a few holes and you are not even aware of it?


    I had a '98 2V 5.4 and changed the plugs at ~100k miles with no issues.
  • K Charles wrote:
    With about 120,000 miles on my '04 V10 I blew out the holes with air, sprayed PB blaster in the holes and just cracked the plugs loose. Next morning they all just came right out.


    That model year head didn’t have the plug issues. It was the 99-mid 02 that had the issue. My late 02 V-10 had the heads with more threads per plug. The older ones only had 3 threads.
    And then yes the poorly designed 3 valve spark plugs. I know of shops that won’t even touch them!
  • Sportsmen wrote:
    I have had three 5.4L engines. A '97 2v an 06 3V and an 07 3V. I never had a plug problem with any of them. I always had them changed at the dealer and had "0" problems with any of those three engines...


    Maybe they heli-coiled a few holes and you are not even aware of it?
  • I have had three 5.4L engines. A '97 2v an 06 3V and an 07 3V. I never had a plug problem with any of them. I always had them changed at the dealer and had "0" problems with any of those three engines...
  • SidecarFlip wrote:
    I always put copper never seize on the threads of my plugs when I change them.
    I've read about this issue with seizing plugs and have always wondered why the plugs aren't given a brush of anti-seize when new. Seems an easy solution, all my plugs get anti-seize and never had an issue with any of them.
  • K Charles wrote:
    With about 120,000 miles on my '04 V10 I blew out the holes with air, sprayed PB blaster in the holes and just cracked the plugs loose. Next morning they all just came right out.


    That's the way to do it and the whole secret with PB Blaster is to let it work a day or more keeping the area wet.

    Larry
  • With about 120,000 miles on my '04 V10 I blew out the holes with air, sprayed PB blaster in the holes and just cracked the plugs loose. Next morning they all just came right out.
  • I always put copper never seize on the threads of my plugs when I change them.