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  • SN95 4.6L Mustang Tech

How to prevent spark plug blowout

  • Thread starter Thread starter Mike97gt
  • Start date Start date Jun 11, 2007
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007

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Jan 29, 2002
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Broke
Dec 20, 2008
#21
  • Dec 20, 2008
  • #21
Ive heard to many nightmares over the years. I have 50k on my 01 now. Ford will be changing my plugs for the updated ones with the extra threads. I'll check them, but if something bad happens I'll be going right back to the dealer.
 
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green01gt

New Member
Dec 30, 2008
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Dec 30, 2008
#22
  • Dec 30, 2008
  • #22
well my #7 plug has blown out. i have iridium plugs in it because the guys at kragen talked me into it saying more power and now i need to time-sert it. i live in rocklin ca, very close to sacramento if anyone has a kit they would like to sell me let me know. time-sert is closed till the 5th and i miss driving my car. i will be putting autolight or motorcraft plugs back in. if anyone has any info regarding my situation please let me know.
 
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bdcardinal

tree hugger
Jun 10, 2003
3,612
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Dec 30, 2008
#23
  • Dec 30, 2008
  • #23
green, check and see if a dealer near you will do it, might be worth the price.

change out the iridiums and go with motorcrafts.
 

flstang65

10 Year Member
Dec 6, 2007
1,484
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SE Georgia
Dec 31, 2008
#24
  • Dec 31, 2008
  • #24
green01gt said:
...the guys at kragen talked me into it...
Click to expand...

I NEVER EVER believe a word those people say at the parts stores. 99.9% of them havn't the slightest about when they are talking about. At least the stores in Orlando. I went in about a part yesterday on my way home form work and the guy was insistent that my car had a DOHC 4.6 in it. I had to take him outside to show him and STILL show him in the repair manual on the shelf.
 
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SilverBullet00

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Jul 5, 2004
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Dec 31, 2008
#25
  • Dec 31, 2008
  • #25
Gearbanger 101 said:
Mike, what's the difference between a Helicoil and a Timesert set up? They seem nearly identical to me? Are the Timeserts made of a material that transfers heat better or something?
Click to expand...

Helicoils aren't solid, they are made of a flat wire that is wound to the correct thread pitch. Timeserts are more like a threaded bushing- they are solid and have a flange on the top so the placement is spot-on. The lock in place a lot better than a helicoil..... To me, Timeserts are much more capable....
 
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green01gt

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#26
  • Dec 31, 2008
  • #26
bdcardinal said:
green, check and see if a dealer near you will do it, might be worth the price.

change out the iridiums and go with motorcrafts.
Click to expand...

i called the dealer and they said three to five grand to fix it. Are there shops that will put in the time-sert for me at a reasonable price?
 
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green01gt

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#27
  • Dec 31, 2008
  • #27
flstang65 said:
I NEVER EVER believe a word those people say at the parts stores. 99.9% of them havn't the slightest about when they are talking about.
Click to expand...
my first clue should of been when he said he put them in his saturn, and had more power! ah ok all kidding aside i should have realized it when i looked at the new plugs and they had more threads, not to put them in. i was told it didnt matter and should of used better judgement and not put them in. Of coarse it was the experts at kragen that said it was ok...... but its my fault now as i put them in i have to eat it. so i can just hope that the other threads are ok.
 
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Jbauer

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Jan 20, 2008
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#28
  • Dec 31, 2008
  • #28
green01gt said:
i should have realized it when i looked at the new plugs and they had more threads, not to put them in. i was told it didnt matter and should of used better judgement and not put them in.
Click to expand...

Yea dude, a lot of people even on this website told me it would be fine to use a plug with more threads..I wasn't buying it at all. I took those POS NGKs back and got good ole' American Autolites.
 

mransr

Founding Member
Nov 3, 2000
1,188
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Jan 1, 2009
#29
  • Jan 1, 2009
  • #29
you know the replacement plugs from Motorcraft (Ford) have more threads now right?


the problem isn't too many threads on the plugs, it's too few treads on the head and that requires you to be very, very careful when changing the plugs
 
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green01gt

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#30
  • Jan 1, 2009
  • #30
i blew out each hole with the air compresser, threaded new plugs with a rubber hose and overall just very careful. when i bought the car i was told he just put new bosch plugs in, so i left then in for awile but was always thinking 'bosch?' i've never liked bosch and figured changing them i would free up a little more power. so i was talked into those iriduim plugs saying i would really have more power by the kragen guys so i figured id try them after they gave the plugs such a great review, but when i pulled the first plug out it was an autolight double platnum and it was still good. i should of just taken the plugs back and left the damn thing alone. so dont fix whats not broke, and i still dont know why i was told he just put new bosch plugs in? its not like it helped the sale..
 
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green01gt

New Member
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#31
  • Jan 1, 2009
  • #31
ah sorry i just have to let my stupidity out a little bit and vent
 
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Jbauer

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#32
  • Jan 1, 2009
  • #32
well then, it looks like i wont be buying plugs from Ford then..it's simple as that.

GO buy Autolites..if you want to risk a blow out go ahead and get something with 20 more thread than you need.
 
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bdcardinal

tree hugger
Jun 10, 2003
3,612
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Jan 1, 2009
#33
  • Jan 1, 2009
  • #33
Jbauer said:
well then, it looks like i wont be buying plugs from Ford then..it's simple as that.

GO buy Autolites..if you want to risk a blow out go ahead and get something with 20 more thread than you need.
Click to expand...

the ford plugs fix the problem when installed correctly. although the base of the problem is in the cylinder head. you can still get the old style plugs from Ford, just get SP-432's, they dont use the old spark plug numbering system anymore.
 
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Jbauer

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#34
  • Jan 1, 2009
  • #34
Yea, i figured they'd still sell the old ones.

The new plugs only fix the problems on the 01+..since they have more thread in their head. but us 99-00 guys don't.

If you've got a 99-00 use the originals..if not then get something with more thread.

Sorry OP, i assumed you had a 99-00..even though your name says 01. my bad
 
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bdcardinal

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Jun 10, 2003
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Jan 1, 2009
#35
  • Jan 1, 2009
  • #35
the Sp432's fit a bunch of other applications which is why they still sell them.

just think of it this way, at least we dont have the problem that the 3v's head where their spark plugs break off in the head.
 

mransr

Founding Member
Nov 3, 2000
1,188
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98
Riverside, SoCal
Jan 1, 2009
#36
  • Jan 1, 2009
  • #36
Jbauer said:
Yea, i figured they'd still sell the old ones.

The new plugs only fix the problems on the 01+..since they have more thread in their head. but us 99-00 guys don't.
Click to expand...

no sorry that's wrong, the new design plugs work for all the PI 2v heads, and they are the recommended replacement...(and the number of threads on the plug doesn't matter anyway...)

also, the best information is that it was sometime during the 03/04 production run that Ford added to the number of threads in the head, 99-02 were all the same (not sure about the non-PI heads)
 

Mike97gt

it doe snot
Founding Member
Jan 26, 1999
10,633
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89
the people's republic of massachusetts
Jan 25, 2009
#37
  • Jan 25, 2009
  • #37
SVT32VDOHC said:
I had one blow out. Came outta nowhere. It took threads too.

AND guys..that Time Sert kit looks expensive!!! I simply bought a cheap heli coil kit from Murrays on the HELP! rack for 11.99! It fixed my car great. It made dyno pulls after that, street races...etc. Never came back out. I also used loc-tite on the outside of the heli-coil.

IF you use Anti-seeze, do NOT use the huge brush that is attached to the cap. Just use your finger, or a Q-tip to gently brush a TINY bit on the threads. There was an issue in a Mustang Magazine where these guys put new Trick Flow Aluminum heads on a 302. They showed a pic and the caption read "With aluminum heads, we couldn't resist giving the plugs a bath in anti-seeze." Or something along the lines of that. The pic showed a plug GOBBED with anti-seeze. I could only think of that fouling a plug out and possibly causing cylinder damage since it's a bit gritty. Anybody else remember that?
Click to expand...

a plug with a lot of anti seize is a bad idea..


the helicoil will work but you can have issues with a hot spot some people have issues others don't..

96SCstang said:
OMG!! i am a mechanic in Detroit area(aka Ford country) and i have had a ton of these 3V nightmares come in. I have the damn special tool and everything to help remove the plug after it breaks. I will never understand the reason for that type of plug. anyone that has seen a 3V plug knows what i am saying. oh and dont use anti seize for reasons that SVTTECH pointed out. it is not necessary and can sometimes cause more damage than good. just take your time, use proper tools(spark plug socket, plug gapper, etc.), torque to proper spec. then go back and check torque again before you start it up, and you will be just fine. also use di-electric grease in the spark plug wire or boot to help spark transfer from coil to plug. if you check the torque every so often this should never happen to you.
Click to expand...

I want to murder the idiots that came up witht he plug on the 3v I feel bad when I quote a tune up on those trucks now.

Gearbanger 101 said:
Mike, what's the difference between a Helicoil and a Timesert set up? They seem nearly identical to me? Are the Timeserts made of a material that transfers heat better or something?
Click to expand...


the regular helicoil has a tang that can stick down into the combustion chamber and get hot enough to fire the mixture early...... detonation =
 

crazystang25

Member
Jan 25, 2009
492
0
16
Jan 25, 2009
#38
  • Jan 25, 2009
  • #38
have you guys tried a perma plug. and also if any one has tried one will it hold up to a little boost
 

Bluebeast02GT

New Member
Aug 11, 2012
2
0
1
Aug 11, 2012
#39
  • Aug 11, 2012
  • #39
GTtopLESS said:
DAAAAAAAAAMN!! That F ing blows....I have my stang all ready for a complete tune-up and fluid change...but this freaking scares the snot outta me. How often does this happen? A really assinine issue to worry about. God I love V8 Stangs, but Ford drops the ball waay to often
Click to expand...

I've blown two in the last six months... granted I wasn't checking them every oil change like recomended. Believe me, check these plugs! I almosted cried the first time and don't really want to talk about the second....
 

Bluebeast02GT

New Member
Aug 11, 2012
2
0
1
Aug 11, 2012
#40
  • Aug 11, 2012
  • #40
So is the actual cause the torque on the plug? I'm sure you guys have already said this in previous posts...
 
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