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Old 03-18-2011, 11:58 PM   #1
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Sparkplugs

I'm about to change them since I just rolled over 103k miles...

Had questions.

I have these sparkplugs and am wondering if they are the right kind, I got the for the '02 Mustang GT but read a lot about sparkplugs being a nightmare in the mod4.6s so I just wanna be double-sure.
Autolite XP104 - Autolite XP Xtreme Performance Spark Plugs - Overview - SummitRacing.com

And when installing it, what in/lbs do I torque it down to? And what is the "gap" and how do you adjust it?




I've always dealt with sparkplugs on old chevy engines and stuff and just did OEM replacements so all these terms are new to me.
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Old 03-19-2011, 12:23 AM   #2
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Re: Sparkplugs

Spark Plug Gap is referring to the distance between the center electrode and the side electrode, the gap can easily be changed using a spark plug adjuster (available at all parts stores, normally round and starts at .020 -.080 gap
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Old 03-19-2011, 12:53 AM   #3
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Re: Sparkplugs

Quote:
Originally Posted by ColeJohnson View Post
I'm about to change them since I just rolled over 103k miles...

Had questions.

I have these sparkplugs and am wondering if they are the right kind, I got the for the '02 Mustang GT but read a lot about sparkplugs being a nightmare in the mod4.6s so I just wanna be double-sure.
Autolite XP104 - Autolite XP Xtreme Performance Spark Plugs - Overview - SummitRacing.com

And when installing it, what in/lbs do I torque it down to? And what is the "gap" and how do you adjust it?




I've always dealt with sparkplugs on old chevy engines and stuff and just did OEM replacements so all these terms are new to me.
I wonder what exactly people have against their owners manual? All the info you want about spark plugs is in there. The plug gap is somewhere around .050" and just go to the parts store and have them look up your vehicle or go to the dealer and get some that way you know it's the right ones. I didn't see anything about a mustang in your link from summit.
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Old 03-19-2011, 01:17 AM   #4
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Re: Sparkplugs

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I wonder what exactly people have against their owners manual? All the info you want about spark plugs is in there. The plug gap is somewhere around .050" and just go to the parts store and have them look up your vehicle or go to the dealer and get some that way you know it's the right ones. I didn't see anything about a mustang in your link from summit.
I checked the owner's manual before consulting the forum... It doesn't have torque specs on spark plugs, unless I am just blind.

Click on the link and view "applications".. It shows this plug is pretty much made for the 281 4.6 V8 of the 99-04 Mustang after you narrow the search results for applications.. I may be wrong though. I just want to be 100% sure before I install and end up blowing out.. I don't have a ton of money just laying around or I would've already put the money into the car. Haha.
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Old 03-19-2011, 01:18 AM   #5
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Don't respond to that guy. He's just a troll.
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Old 03-19-2011, 01:29 AM   #6
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Re: Sparkplugs

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Originally Posted by Alscobra View Post
Don't respond to that guy. He's just a troll.
Ah.. Oh well..

I still need to know the torque specs. Haha. I REALLY don't wanna mess this up.

Oh.. And if the Autolite Iridium sparkplugs will be ok for the car.
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Old 03-19-2011, 01:32 AM   #7
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Re: Sparkplugs

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Ah.. Oh well..

I still need to know the torque specs. Haha. I REALLY don't wanna mess this up.

Oh.. And if the Autolite Iridium sparkplugs will be ok for the car.
I always just snug plugs down and give em about a half turn. I know you have aluminum heads, just don't strip em out and you should be good. They don't need much.
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Old 03-19-2011, 01:33 AM   #8
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Originally Posted by ColeJohnson

Ah.. Oh well..

I still need to know the torque specs. Haha. I REALLY don't wanna mess this up.

Oh.. And if the Autolite Iridium sparkplugs will be ok for the car.
I usually use the oem plugs. Autolite and motorcraft. I never checked for torque specs on a spark plug ever. I've been a mechanic for about 13 years. I'm not sure where to even find torque specs on plugs.
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Old 03-19-2011, 01:34 AM   #9
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Re: Sparkplugs

7-14 lbs.
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Old 03-19-2011, 01:35 AM   #10
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Re: Sparkplugs

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I usually use the oem plugs. Autolite and motorcraft. I never checked for torque specs on a spark plug ever. I've been a mechanic for about 13 years. I'm not sure where to even find torque specs on plugs.
Well I have Autolite plugs to put in.. So I guess that's a thumbs up? Lol.

So handtight down, then a quarter to half turn? Sounds good to me.
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Old 03-19-2011, 01:35 AM   #11
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Re: Sparkplugs

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I usually use the oem plugs. Autolite and motorcraft. I never checked for torque specs on a spark plug ever. I've been a mechanic for about 13 years. I'm not sure where to even find torque specs on plugs.
Mustang Torque Specifications Specs
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Old 03-19-2011, 01:36 AM   #12
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Re: Sparkplugs

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7-14 lbs.
Awesome! Thanks man.
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Old 03-19-2011, 01:37 AM   #13
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Re: Sparkplugs

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Don't respond to that guy. He's just a troll.
Ok I'm cool with that, but I usually just state the obvious. And to the OP I wouldn't worry about the torque specs. It just comes down to you either know the feel or don't with aluminum. I hate to say it that way. There are those who have stripped out threads and those that haven't yet.

I inspect welds and follow ironworkers to check the tension of bolts that have been impacted. And unless you have an expensive high quality torque wrench the readings you will get from a cheap one can be off as much as 10-25 percent.

I love how people here hate the imports and the import forums hate the mustangs and I love that I own both and can talk about both in an unbiased way and speak from experience. I'm a car lover not a mustang lover but sometimes I like mustangs, relax people. I like being a troll.
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Old 03-19-2011, 01:42 AM   #14
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Re: Sparkplugs

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Ok I'm cool with that, but I usually just state the obvious. And to the OP I wouldn't worry about the torque specs. It just comes down to you either know the feel or don't with aluminum. I hate to say it that way. There are those who have stripped out threads and those that haven't yet.

I inspect welds and follow ironworkers to check the tension of bolts that have been impacted. And unless you have an expensive high quality torque wrench the readings you will get from a cheap one can be off as much as 10-25 percent.

I love how people here hate the imports and the import forums hate the mustangs and I love that I own both and can talk about both in an unbiased way and speak from experience. I'm a car lover not a mustang lover but sometimes I like mustangs, relax people. I like being a troll.
Then don't troll in tech areas.
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Old 03-19-2011, 01:46 AM   #15
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Come to the BS thread. We can rag on you all night.
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Old 03-19-2011, 01:49 AM   #16
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Re: Sparkplugs

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Come to the BS thread. We can rag on you all night.
This

http://www.mustangevolution.com/forum/f311/t286237-79/
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Old 03-19-2011, 10:45 AM   #17
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Re: Sparkplugs

103,000 miles ?????
WOW ARE YOU Going to feel a difference !!!!
i don't care what the dealers recommend , there's no spark plug that lasts 100,000 miles !!!
plug gap is .054 / don't forget to put a little anti-seize on the plug threads ...
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Old 03-19-2011, 11:32 AM   #18
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If your pulling the plugs anyway buy some seafoam spray and do a piston soak. At that mileage your gonna have alot of carbon build up. You will thank me later if you do.

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Old 03-19-2011, 12:00 PM   #19
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Re: Sparkplugs

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If your pulling the plugs anyway buy some seafoam spray and do a piston soak. At that mileage your gonna have alot of carbon build up. You will thank me later if you do.

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This mother****er needs a job with SeaFoam. STAT!
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Old 03-19-2011, 01:40 PM   #20
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This mother****er needs a job with SeaFoam. STAT!
Hehehe...well the stuff works. I would love a lifetime supply. Woohoo...then I would get all my buddies over n do their cars...really smoke out the whole neighborhood. Too bad you weren't closer,I could do your new ride

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Old 03-19-2011, 01:46 PM   #21
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Seafoam whore.
Naw, that stuff is great for real.

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Old 03-19-2011, 01:50 PM   #22
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Seafoam whore.
Naw, that stuff is great for real.

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Yup...seafoam,amsoil and now moly slut .... if I could find a way to get paid out of this deal I would be a whore. Any ideas

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Old 03-19-2011, 01:53 PM   #23
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Once my injectors get here I am gonna do a iPhone movie of changing the plugs,piston soak of seafoam spray and injector change all at once. Then if Brent wants he can add it to tech here and we can ad it at petom

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Old 03-19-2011, 01:59 PM   #24
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Re: Sparkplugs

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Once my injectors get here I am gonna do a iPhone movie of changing the plugs,piston soak of seafoam spray and injector change all at once. Then if Brent wants he can add it to tech here and we can ad it at petom

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Definitely!
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Old 03-19-2011, 02:03 PM   #25
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The seller is shipping my injectors Monday and I gotta get tr-55 nitrous plugs so prolly weekend after next I will get to it. If I email you the movie 93 can you find a way to post it for us?

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Old 03-19-2011, 02:12 PM   #26
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Re: Sparkplugs

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The seller is shipping my injectors Monday and I gotta get tr-55 nitrous plugs so prolly weekend after next I will get to it. If I email you the movie 93 can you find a way to post it for us?

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I can try. Can you upload it to youtube? That might be easier and you should be able to do it right from your phone.
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Old 03-19-2011, 02:13 PM   #27
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I can try. Can you upload it to youtube? That might be easier and you should be able to do it right from your phone.
I should be able too...once I do it if I hit a snag expect a phone call

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Old 03-19-2011, 02:14 PM   #28
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Hehehe...well the stuff works. I would love a lifetime supply. Woohoo...then I would get all my buddies over n do their cars...really smoke out the whole neighborhood. Too bad you weren't closer,I could do your new ride

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I'm doing all that this week!

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Old 03-19-2011, 02:15 PM   #29
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I'm doing all that this week!

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I really like your fox. That is one *****in ride. Looks in pretty good shape too

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Old 03-19-2011, 03:11 PM   #30
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I've never used seafoam. But we've always had in house chemicals at the dealers to do the job.
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Old 03-19-2011, 03:21 PM   #31
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I've never used seafoam. But we've always had in house chemicals at the dealers to do the job.
Those chemicals are some pretty harsh **** sometimes. Seafoam is 100% petroleum. Safe on gaskets and rubber. And it works.

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Old 03-19-2011, 03:26 PM   #32
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From what I've been taught from training classes. Techron is one of the best chemicals to get rid of carbon. Same stuff chevron uses. We used to get bottles of it straight from our suppliers.
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Old 03-19-2011, 03:29 PM   #33
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From what I've been taught from training classes. Techron is one of the best chemicals to get rid of carbon. Same stuff chevron uses. We used to get bottles of it straight from our suppliers.
They have it in their fuel too...look at the ingredients. It's very similar to seafoam. Like almost the same. But costs more

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Old 03-19-2011, 03:30 PM   #34
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They have it in their fuel too...look at the ingredients. It's very similar to seafoam. Like almost the same. But costs more

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And techron isn't suggested to dissolve sludge in the crankcase.

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Old 03-19-2011, 03:31 PM   #35
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Nope. Just for carbon. That's the hardest **** to get rid of.
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