Iridium or platinum?
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Mountain Pass
Joined: Feb 2004
Posts: 197
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From: In the swamps of Florida
Iridium or platinum?
I getting ready to replace the stock spark plugs on my '02 F-150 with the 5.4L. The owners manual calls for Motorcraft AGSF-22W. The only place I've been able to find these plugs is at the dealer for $8.49 each 
. Can anyone tell me what the equivilant Autolite plugs would be? I've been told by several people to only use Motorcraft or Autolite plugs. Thanks!
. Can anyone tell me what the equivilant Autolite plugs would be? I've been told by several people to only use Motorcraft or Autolite plugs. Thanks!
Moderator
Joined: Dec 2001
Posts: 22,436
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From: Louisville,Ky.
Platinum.
Motorcraft SP-479 @ autozone for about $3.50 each or Autolite APP103. About $4 @ autozone.
I used the sp-479 in my 01 5.4L with no problems. These newer plugs have more threads than the original, but work the same.
Motorcraft SP-479 @ autozone for about $3.50 each or Autolite APP103. About $4 @ autozone.
I used the sp-479 in my 01 5.4L with no problems. These newer plugs have more threads than the original, but work the same.
Post Fiend
Joined: Feb 2000
Posts: 11,496
Likes: 6
From: Kansas
What they said.
I tried the iridium and pulled them out after @500 miles and installed Autolite double plats. Longer starts was one of the problems with the iridiums. That was $100 wasted plus the time and effort to change the plugs twice.
I tried the iridium and pulled them out after @500 miles and installed Autolite double plats. Longer starts was one of the problems with the iridiums. That was $100 wasted plus the time and effort to change the plugs twice.
Elder User
Joined: Jun 2004
Posts: 747
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From: Pelahatchie, MS
Here is the link to the post that will have all the info you could want on this subject, and then some: https://www.ford-trucks.com/forums/1...ark-plugs.html
Above all, just make sure you torque them to specs...
Hotshot
Joined: Aug 2002
Posts: 12,679
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From: BC, Canada
Nope. They just last longer.
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Mountain Pass
Joined: Feb 2004
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From: In the swamps of Florida
Well, I wound up getting the Autolite double platinums from my local Napa. Will be replacing them tonight.
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Postmaster
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You will be happy with those. The iridiums would work well too, but they would offer no real world benefits. The iridium lasts longer, but that doesn't stop them from gradually fouling out. So you would end up replacing them at the same interval as a platinum plug anyway.
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You will be happy with those. The iridiums would work well too, but they would offer no real world benefits. The iridium lasts longer, but that doesn't stop them from gradually fouling out. So you would end up replacing them at the same interval as a platinum plug anyway.
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Mountain Pass
Joined: Feb 2004
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From: In the swamps of Florida
Well, I changed the plugs tonight. It took about an hour and fifteen minutes and wasn't really that difficult. The hardest part was finding the right combination of swivels and extensions to make it work. Turns out the factory plugs had already been replaced at some point, but I put the new ones in anyway.
Postmaster
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I'm not sure I understand what you are saying. When plugs wear out they do not "gradually foul out". The electrodes wear, the gap increases but fouling out isn't what happens. If your plugs are fouled on a modern fuel injected engine, you have much bigger issues than worn plugs.
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This is what doesn't make sense. Doesn't really matter though. Just seemed misleading to say the plugs would foul out.
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