spark plugs

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JohnA

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Anyone had any experience with NGK 372 as replacements? Also heard that folks were replacing COPs at same time. Any feedback?
 

aircargoo

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if its a 4.6 ford...dont usem.i tried them few yrs back and replaced them days later cause misfires...after putting in motorcrafts...here i am 5yrs today replacing them with motorcrafts. just did them yesterday. didnt need to but did. my plugs were pretty good for 5 yrs....after inspecting them. was replaced cause of bad wire. whole set up wires plugs coils (packs) not c.o.p...5 yrs old . motorcraft parts...except coil packs.there were m.s.d
 

rjdelp7

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Motorcraft Oem Platinum tip, is the best choice. They are a 75,000 mi plug. Ford had loose spark plug issues. The fix was a change in the threads on the new plug. For that reason alone, use the Motorcraft. Change them while its cold(very important). Inspect the coils, they are expensive. If money not a issue, change them. If they look ok, I would put them back in. I had one that looked rough(cracked). It was still working, but I changed it.
 
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JohnA

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thanks for the help. still debating the iridium vs Motor craft, cops look OK but who knows. For the record its a 2010 XLT w/5.4 3v.
 

Habbibie

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Motorcraft SP-515. This is the new design plug... The one that doesn't break and rated for 100,000 miles. (What I and many others here are using happily)
 

purevw

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To answer your original question, I'm using NGK 372 plugs in my 2011 Expy with a 5.4
I only have a couple of thousand miles on them, but I'm happy so far.
 
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JohnA

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thanku purevw. still debating. Understand SP515 is still 2 pc design. that's y I'm considering ngk.
 

Dani Vela

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I changed mine a three years ago for the first time at 96k miles. I am currently at 106k on my 03 Expedition. I used E3 spark plugs. I am happy with them. Getting ready to do a tune up on my impala and will be using E3 plugs on that too.
 
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