spark plugs

[JohnA]

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

 

[Habbibie]

Year? Make? Model? Engine?

 

[aircargoo]

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

 

[grantpa]

Ford Techs generally advise using motorcraft plugs and coils. You'll be money ahead in the long run.

 

[rjdelp7]

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.

 

[JohnA]

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]

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]

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.

 

[JohnA]

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

 

[Dani Vela]

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.

 

[JohnA]

Sorry I hadn't updated y'all. Put iridium NKG372's in last week at 104+K. Ran a bottle of Techron (?) thru gas tank prior. All old, original from factory motorcraft came right out. were new design sfc509 w/antiseize. Most had worn down/missing center electrodes but no misfiring at replacement time. wife averages 14.5 mpg in last year per onboard computer. Car seems to have much better p/u and over last few days shows 14.9-15.0 mpg w/same driving habits (y'all know what I'm talking about, I'm sure). will update again after 1000 miles or so. Thanx for all the responses.