2000 NAVIGATOR Spark plug change
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Joined: Nov 2005
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2000 NAVIGATOR Spark plug change
Hi,
I'm approaching 100000 miles on my Navigator, it has the DOHC 5.4 in it, I know it is recommended I replace the plugs at 100000. My local ford dealer wants 530.00 for the job, when i asked them if that covers any plugs that would break they said no that would be extra and stated the job could cost upto 2000 if all 8 broke as they would have to do a head job. I laughed and hung up. My qusetion is how many people have actually had there plugs break on this forum and did they repair them themself or have a shop do it. I have done many plug changes but never on this type of motor. thanks giovanni
I'm approaching 100000 miles on my Navigator, it has the DOHC 5.4 in it, I know it is recommended I replace the plugs at 100000. My local ford dealer wants 530.00 for the job, when i asked them if that covers any plugs that would break they said no that would be extra and stated the job could cost upto 2000 if all 8 broke as they would have to do a head job. I laughed and hung up. My qusetion is how many people have actually had there plugs break on this forum and did they repair them themself or have a shop do it. I have done many plug changes but never on this type of motor. thanks giovanni
Senior User
Joined: Feb 2009
Posts: 491
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From: Southern Illinois
You can do the job yourself and save the money. You just need to have time on your hands - to be honest.
I'm not sure if the amount of threads per spark plug is different as compared to the SOHC 5.4s, but if you can, spray penetrating oil down each of the plug wells and let it sit for a day before trying to remove the plugs.
If the DOHC heads have more threads per spark plug like the 3V 5.4s, I think I've read that the guys in the Super Duty section run Marvel Mystery oil in there truck a few days before starting the job, and the reported success rate for removing plugs without breaking has been very good.
Both ways, if you can be without the vehicle for a few days while you do the job, I'd let it sit and spray some PB Blaster or something along those lines be patient while it soaks around the plugs.
Just a thought.
I'm not sure if the amount of threads per spark plug is different as compared to the SOHC 5.4s, but if you can, spray penetrating oil down each of the plug wells and let it sit for a day before trying to remove the plugs.
If the DOHC heads have more threads per spark plug like the 3V 5.4s, I think I've read that the guys in the Super Duty section run Marvel Mystery oil in there truck a few days before starting the job, and the reported success rate for removing plugs without breaking has been very good.
Both ways, if you can be without the vehicle for a few days while you do the job, I'd let it sit and spray some PB Blaster or something along those lines be patient while it soaks around the plugs.
Just a thought.
Senior User
Joined: Oct 2009
Posts: 118
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i didn't have any issues with replacing my plugs.
plug #4 is just hard to get to i used a 4 inc. extension than a 6 inc. extension a swivel and a 10 inc. extension and it worked great.
i recommend using bosch spark plugs.
good luck
plug #4 is just hard to get to i used a 4 inc. extension than a 6 inc. extension a swivel and a 10 inc. extension and it worked great.
i recommend using bosch spark plugs.
good luck
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