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Thread: The Duratec Sparkplug Sticky Reply to Thread
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Topic Review (Newest First)
04-18-2017 09:44 PM
mac.mogul For most people, copper plugs would be a yearly replacement item. Not too bad at $3 each.
04-18-2017 12:43 PM
Miztaken1312 And also keep in mind copper plugs do not last very long. Although high in conductivity, their durability is the lowest.

I run the Autolite 103 copper plugs by instruction of FSWerks for the turbo kit. I change them every other oil change (15k).
04-17-2017 10:38 PM
sailor The OP talked about performance plugs and stock type, those std. autolite plats would be a step down from stock in longevity and not a performance improvement.
04-17-2017 07:31 AM
Miller88 I'm about ready to change spark plugs on mine again at 73000 miles.

Just read the first post. What's wrong with AutolitePlatninum? I ran them on mine for the last 30K without issue.

I will probably go with NGK or Autolite copper anytime this next time around. Copper is easier on the coils.
02-12-2017 12:49 PM
mac.mogul
Quote:
Originally Posted by FocusSmocus View Post
so what plugs and gap would be best for performance in an mk3?
Search the mk3 Duratec forum.
02-11-2017 04:03 PM
FocusSmocus so what plugs and gap would be best for performance in an mk3?
11-06-2016 07:04 PM
notfortheweak okay.
I ask if they carry them on the shelves.
Ill try those next tune up
11-06-2016 10:38 AM
mac.mogul
Quote:
Originally Posted by notfortheweak View Post
Where do you purchase your AR103s?
Pretty sure you can still get them on Amazon.
Walmart carries them online.
Oreilly's can order them.
Etc.
11-05-2016 05:46 PM
notfortheweak
Quote:
Originally Posted by mac.mogul View Post
It is one step colder than the 104. There is zero chance that you will foul a plug and misfire because of the heat range. Your AZ Bro is talking out of his butt.

Now, if you went to something like an Autolite Racing AR92 plug, then you would have issues because that is 4 steps colder and should only be used on a forced induction application with appropriate tuning.

The Autolite 103s are fine for normal use on the Duratec 2.0. Gap them to 0.055 (some have gone to 0.060 with no issue) and you'll never have a problem. You'll see better MPG and smoother engine operation.

It is important to note that if you're looking for more power, you'll need to get the Autolite Racing AR103 plugs. The flame front is open compared to the design of the A103. The same benefits apply, with the addition of a couple extra horsepower.

Also note that copper plugs require replacing every 10-15k miles. I replace mine every year, it's just easier. Inexpensive and only takes about 20 minutes.
Where do you purchase your AR103s?
11-03-2016 04:49 PM
mac.mogul
Quote:
Originally Posted by Conman50 View Post
BUT!! The guy at the AZ store said that since I am moving to a lower heat range that I may not be burning fuel efficiently and might possibly burn up the cat converter? Anyone have issues with this? He says If I see a CEL then I should switch back to the hotter plugs.
It is one step colder than the 104. There is zero chance that you will foul a plug and misfire because of the heat range. Your AZ Bro is talking out of his butt.

Now, if you went to something like an Autolite Racing AR92 plug, then you would have issues because that is 4 steps colder and should only be used on a forced induction application with appropriate tuning.

The Autolite 103s are fine for normal use on the Duratec 2.0. Gap them to 0.055 (some have gone to 0.060 with no issue) and you'll never have a problem. You'll see better MPG and smoother engine operation.

It is important to note that if you're looking for more power, you'll need to get the Autolite Racing AR103 plugs. The flame front is open compared to the design of the A103. The same benefits apply, with the addition of a couple extra horsepower.

Also note that copper plugs require replacing every 10-15k miles. I replace mine every year, it's just easier. Inexpensive and only takes about 20 minutes.
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