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spark plugs


myranger26105

myranger26105

Well-Known Member
Joined
Aug 21, 2008
Messages
215
Age
39
City
vienna, west virginia
Vehicle Year
2003
Transmission
Manual
just went to autozone and advance auto and they both told me that my 03 ranger 4.0 4x4 uses iridium spark plugs they r 8 dollars a piece is this BS or is it true
 
These ones!

myranger26105 said:
just went to autozone and advance auto and they both told me that my 03 ranger 4.0 4x4 uses iridium spark plugs they r 8 dollars a piece is this BS or is it true
Click to expand...

Your engine takes the motorcraft AGSF34FP... This has been renamed by motorcraft to SP-440.. You may find that plug with either or both markings on it.
That is by far the plug of choice for your engine.
Big JIm:hottubfun::wub:
 
Iridium is expensive. its highly resistant to electrical wear. Or any wear for that matter.

Since its a rare element on earth that makes it expensive as well.

If I remember it correctly its the second hardest metal known to man. with osmium being the hardest. this makes it rather hard to work with also adding to the cost.
 
thanks for the info guys but auto zone only has the iridium plugs for my truck so i think i am going to try somewhere else
 
Try the dealer man, they are the ones spec'd and recommended for our truck. Made by Honeywell who also make Autolites the Motorcraft plugs are great plugs at a reasonable price. Plus they are usually just change and go on most Ford applications, gapping be gone!
 
PLEASE check the gap in the new plugs before installing them!! I have NEVER found a new set of plugs that were already gapped correctly!!
A properly gapped set of new SP-440 Mororcraft plugs will last over 100,000 miles.
Big JIm
 
OK. I work at Advance and looked this up. The reason they are recommending Iridium is the benefits it offers. Iridium will last the longest BUT the OE plug is Platinum. Motorcraft's plug recommendation is #SP498 and cost $4.69 each. There is a nickel plug also #SP412 at $3.49 each but it's below recommended specs. It will work fine but will wear much faster than platinum or iridium and if you have never changed plugs in a 4.0 then woohoo!

Next time you go in ask for the Commercial Pro. They will have the most knowledge and will give you answers and good recommendations for parts. I'm that person at my store and have been in parts for 25 years.

The reason most parts stores offer parts that may be more expensive is the OE companies send their parts info to the catalog programmers many times per year to update what they want you to sell. Motorcraft probably has updated your plug recommendation a few times since 03.

Another good idea is go to the branded web sites and see what that brand is wanting you to use. Get your own part number then go get the part. For Ford go to http://www.fordparts.com . They will show you the latest update on what to use in your truck.

Hope this helps.
 
i bought and tried the Iridium plugs and my truck absolutely LOVES them.
who cares about the price really when your doing this how often?? find something you like and go with it.

Someone else said it earlier but it cannot be said enough...... remember to gap them! no matter what the brand.
 
well i now have a new issue i replaced plugs and wires but now it is spitting and sputtering and its not throughing codes i can not figure out what is going on i went over the fireing order to make sure i didnt mess that up and its still not acting right this has been bothing me all day


i cleaned the maf
 
Last edited:
A few things to consider

myranger26105 said:
well i now have a new issue i replaced plugs and wires but now it is spitting and sputtering and its not throughing codes i can not figure out what is going on i went over the fireing order to make sure i didnt mess that up and its still not acting right this has been bothing me all day


i cleaned the maf
Click to expand...

1. Almost always this is a result of crossed wires.. Get a new face to inspect your work while you hide in the weeds. DON'T give advice!
2. Sometimes it is a result of a cracked plug...done by accident when installing.
3. Rarely it is a result of the electrode being jammed shut while installing, but it is known to happen.
4. Once in a while the installer will inadvertantly brush against another sender or vac hose and seperate it.. causing a bad result. Or even unplug something and forget to reinstall before finishing.
Big JIm:hottubfun::wub:
 
had someone else look over all my work and they said catalitic converter so i drove it around and yep thats it, it was glowing red and had a weird smell so now trying to figure out what to do about that
 
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