hey peeps...looking for some info on putting NGK Sparks plugs in my 4.0....my buddy swears by them so i think im going put them in my truck...if any one has them i like to hear what they have to say about them....and if anyone knows what the part number is for them...thanx....Oh and if any one knows what Wire set i should run with these plugs.....

 

I just had them installed...

NGK Iridiums..part number..so sorry ford kept the packaging so no can do...the engine doesnt hesitate like is used to with the old plugs but they were kinda warn out..i like them im also having a set of MSD wires fab'd up and just waiting for them to get here but the stock do awsome!

 

i'm using the ngk tr6's. theyre a standard copper-core plug. theyre like $7 for 4 plugs at clubplug.net. i personally like em better than the autolite coppers because the autolite heads are black and the ngk's are silver... it makes it easier for me to read the ground strap on the plug, imo.

 

Do the NGK's improve milleage or horsepower any? I found these E3 Performance Plugs that say they will improve mileage and performance significantly. A little pricey. Anyone try em before?

 

I don't think any spark plug will give you any significant improvement in mileage or performance. I do know I got talked into trying the Bosch #4305 +2's for my 01 and they ended up in the trash can after 3 weeks. Using NGK 7164's now.

 

ive got NGK irridiums in my truck they are coming out when the weather gets warm.

mpg has gone down.

im putting back in the stock plugs

 

ok so i did notice a drop in MPG after install....why though...why would this plug affect that so bad? compaired to say the stock ones? cause if this keeps up im gonna take them out and put stock back in too...but they did help the hesitation then again the old plugs were done for.

 

i have ngk tr55-1s, big difference in performance for me, but im supercharged and they burn cooler than stock. mpg actually went up ... but its gonna be a diff result for a natural aspirated engine ....

 

I hate to jack this thread, but guys seriously, take a look at this stuff, i think im set on getting a set---->E3 Performance Spark Plugs

 

I have had Autolite XP5144's in ran great gas mileage dropped like a rock.
Put in Bosch 4305's ran great gas mileage stayed down, ran great, idled bad.
Now have NGK 7164's will have to see how mileage is. If it stays down back to the MotorCraft plug for sure. Frankly it makes no sense why; although there is something interesting on the NGK site in regards to their plug number 6044 saying it is the "OE" plug replacement with some special tip on it but @ $12.00 each I don't think so.

 

More research, I must have been born yesterday. The plug listings are all wrong on the NGK site until the 05's for the "E" VIN code engine. They have the correct info listed under the "X" VIN code engine, go figure. Looks like the same is true all over the Internet through year 04. What a joke. Makes sense as your putting in a plug that is too cold. Should have known better on this one from other threads / posts. It's only $$$, time and beat up hands.

 

I just use autolite dbl platinums every 50-60k miles or so.
They are pretty much identicle to the motorcraft ones..
(I heard autolite makes the motorcraft ones for ford)

An Important thing to remember if you have the 4.0
the 2001+ 4.0 takes a much longer plug than the old pre-2001's
some places WILL give you the wrong plug.
Have them check part numbers for year 2000, and your year (if 2001+ of course)
if they are the same model number dont buy .

Rand

 

Sorry...

 

lol why are you sorry? it was worth a try? it ran smooth and good for a while. im not blaming anyone.

 

We have those @ my work & a boy that worked w. me put them in his Integra. After while, the damn things were shooting sparks outside of the motor & a piece of metal flew out... So I say poo on those.

I'd get either the Iridum or the platinum 4...

Brenton

 

its also important to make sure your plug gap is right. if its too small you can lose gas mileage.

the plug gaps arent always right for your application right outta the box; my truck stock calls for a .042" - .046" gap, and the ngk tr6 (colder plugs than stock) were gapped at .035".

I left em at that because i'm running nitrous, but if youre N/A, you'd probably want to regap them.

I think the 4.0 manual calls for gaps like .062"-.067", or something around there.

 

yes i regapped mine.

 

Got the new NGK TR55-1IX(7316)'s in yesterday. Wow, if it felt any better I swear another cylinder grew on the engine. Although running with the wrong stuff over the last month or so..........hard to compare.

 

Im not sure about the iridium, but the platinum 4 I wouldnt recommend. My truck idles a little rougher. It does run well on the highway when warmed up, but definately not worth the big$. I cant speak for everyone, but the gains on "performance" and mpg's dont seem to change much in either direction. Still I wouldnt bother changin plugs unless your tunin up. Its just a hassle to do it for no reason.