Why the spark plug blew out of your ford Triton engine (the sequel)
HTML-код
- Опубликовано: 29 сен 2024
- IF THIS VIDEO HELPED YOU OR SOMEONE ELSE, CLICK HERE TO DONATE SO I CAN CONTINUE TO SHARE VIDEOS. (THANK YOU)
checkout.squar...
Amazon parts link amzn.to/2zSX6Z7
Link to my personal parts provider at Wiseautotools.com www.wiseautoto....
Revised video on CalVan inserts on Ford Triton 2 valve engines. Link to my video about why. • Why the spark plug ble...
Ron Williams
Mobile Fix Automotive
26793 Madison Ave Suite 100
Murrieta, Ca. 92562
951-579-7146
Website www.mobilefixau...
FaceBook / mobilefixaut. .
Yelp Reviews www.yelp.com/b....
Mobile Fix Automotives new revised installation video on using the 38900 CalVan spark plug insert tool.
My supplier for the calvan kit is WiseAUTOTools.com
www.wiseautoto....
More updated information on the Cal-Van 38900 kit and spark plugs blowing out of the 2 valve modular Triton engines.
Rob your approach and overall logic about this installations is so consistent that I have become "Blindfolded" and I will follow whatever advice you provide..
I'm one of those "One less thing to worry about" persons, maybe because I work on helicopters and rally bikes for many years were absolute reliability is kind of matter of life and death...
Thanks for sharing so much of what you know..
Ricky
PS: Hey maybe a silly idea, did you ever consider taking a trip around the country fixing heads ...??
Now that Diesel Ron is gone (rIP, hell of a man) is only you left to do the job at 110%
Hey man from one mechanic to another thanks for a great video. And I'd like to say that some people you just can't help, they think they know something when they don't, and unless they've been there and done it like we have it's hard to convince them. Keep on being the best you can be and help those that you can help.
Great videos, my 02 F150. 4.6 has done 3 of them now. Last one was today after pulling out of a parking spot. Really frustrating.
great video. Thanks for the update!
I have an 04 GT 2V, 140k and it now has a 2nd one blown out... Lucky me -.-
I am doing a Calvan kit on my 4.6, and I have done every cylinder bc my 3 and 4 blew. But when I went to do my 4 cylinder or passenger far rear, I cannot get the guide to slide down in the hole properly due to what I can only figure is the intake. Any advise??? Please help
Good video!!!
why does this happen in Honda Odyessy 2005
I have a 2007 f150 triton v8. Spark plug blew out, cylinder 8, had an insert put in, but now is doing the same thing p0308, is this spark plug with the insert going to be the same size as all the others?
Ford should’ve had a recall and use cal van inserts to fix the problem. Plus their engineers to redo the cylinder heads design. They should’ve known better that 4 threads wasn’t enough to hold that kind of pressure.
4.6's don't blow plugs?.....LOL, I had two and they both blew out plugs....
2004 and up I haven’t done any
Joe K my 2008 just blew out
Brendan Amadon what car?
2008 my crown Victoria did
Mine just blew
My 2005 4.6 spit out a plug a week ago. You are correct 4.6 will blow plugs.Thank you for your videos vary helpful.
Building engine's for decades and can't design a head that retains the spark plug, absolutely pathetic Ford pathetic.
What you talking about. The push rod engines never had the problem with spark plugs blowing out
Didn't say they did.
Ford is not unique with this problem, but I'm with you as I had a spark plug blow out of an F-150 and was shocked!
2011 ford 4.6...YES SPARK PLUG is pop out..yes Is TRUE...THANKS
4.6 3V “VVT”was in the Ford Mustang from 2005-2010, also in the Explorer. Could also be ordered in the 2009 and 2010 f150.
You’re correct
Ron Thank you for making your vids!! 2002 F150 4.6, 133k. Blew out # 3. Found out about the bad Cal-Van incerts the hard way. Called them and they made it right, sent me 8 new ones right away. Found #5 finger tight (surprised?) went ahead and "Cal-Vaned" that one too. I am a very accomplished DIY mechanic, and I still use videos like yours to help me keep my stuff on the road. Bore scoped all of the rest of the threads. They seemed sharp and present, so 17 ft pounds on new dry Motorcraft plugs. I should be good to go. Thank you again!
Ive had 2 spark plugs blow out of my 2003 mustang gt. And it has the 4.6. Gotts love people who think they know everything. You're videos have saved me sooo much time and money. I do all my own work and this was a first for me. I love my Calvan 38900 !!!!
Hey Matt glad you posted that it worked for yours. my 2003 ford mustang gt 4.6 just blew one out on my way to purchase some calvan's
Thank you this has been the most helpful video I have watched. Mine is a Triton 5.4 and it blew out you guessed it the number 3 plug.
Blows my mind the amount of ignorance on this issue....the increased torque specs of 25 ft-lbs solves it. I have been using it for years now on all the 2v's and never had one come back. The half dozen 2V 5.4's I have owned through the years as well as my 2V V10 in my Excursion has never blown a plug in 265,000 and I change them every 50K.
You are so right.. 😊I just had a blown spark plug on my 2001 4.6 Ford f150. So your trolls don't know what they're talking about. 😮
Number 3 on my 5.4 blew out at 210,xxx. I'm putting cal van inserts on all 8 plugs. Had leaking intake gaskets and let me tell you it was a breeze doing the inserts without the intake on. Also changed valve cover gaskets while I was at it.
I have a 5.4 2 valve 139,800 it’s very clean the plugs were changed once anything I should do first before replacing them . Spray pj blast or wd40 down around the threads and let them soak for a day before slowly trying to remove them . Thank you
I just did the #4 plug on a 2002 4.6L... oh hell yes they blow out. And yes, the #4 is definitely a pain in the ass! 440K KM, I've owned it for almost a year and a half and judging by the plugs that were in #4 and #8... they had been in there a LONG time. Ron, THANK YOU for the videos! They are pretty much the only reason I got it fixed and back on the road so I could get to work. I couldn't do the Cal-Van kit because of price and availability, but I did find another that addresses some of the concerns mentioned in this video and it only cost $50 CAD! That said, it did have the same inserts with only 4 threads. If I can find the dimensions, I'm going to make my own stainless ones with a head on them (I'm a machinist) that are fully threaded.
Ummmmm yeah the 4.6 V8 Triton DOES blow spark plugs. Mine is sitting in the driveway right now as I type this with a blown plug. Going into the shop next week... Who ever has said it doesn't just hasn't had it happen yet....
Watching this video about it not happening is ridiculous my 2003 Mustang 4.6 blew out because it's ford's defect 3/ 4 treads holding a 14 tread spark plug and now it just happened to my 5.4 e150 .Ford dogged us on this and it's a serious problem and most mechanics want to rip you off . Cal van is the answer for sure .
I just had my 2010 Ford E-250 with the 4.6 engine just blew a spark plug! Used this kit and fixed it! So why is this model blowing plugs?
Don't let the comments from these drugstore mechanics get to you. They're just a bunch of know-it-alls.
I found this so very helpful. Thanks, and I'm subscribing right now. You're the only one to explain the problem with my 2002 5.4. And it's the # 3 plug just like in your video. I've never liked working on ford's. I'm a GMC kind of guy.
We got a 98 f150 2v 4.6 256k and never been left dead on the road and never blew out any plugs
I’ve had to insert 3 different 4.6 and 1 5.4 with the calvan kit. I’m here to confirm that they do indeed blow out spark plugs. My personal 02 mustang gt blew its spark plug out at 103k miles. I’m a second owner and 1st owner had all his maintenance done at the dealership. Babied or not, it will happen eventually
I did all 8 on my 2001 f250 5.4 two valve .it has been 4 years ago. And I have had no problem. He is speaking the truth. (CALVAN IS THE ONLY WAY TO GO.
What did it cost you to have all 8 done?
Just curious, since you already have those heads off will you go ahead and install inserts in all 8 cylinders?
I am a technician. Thank you for your videos!!! On Saturday morning September 19 2020 I blew a spark plug out of my 6.8 V10 2005 Ford Excursion. Cal Van tools worked great!
Happy to say i was able to install my first cal-van insert! Everything went smoothly, Ron thank you very much, if it wasn’t for the videos I wouldn’t be able to do this. Keep up the good work and keep them videos coming. 🙏
I used jb weld and it worked,The plug stayed.
MECHANICS HATE HIM!
SPARK PLUGS LAST FOREVER
WITH THIS ON SIMPLE TRICK!
Mine just blew out plug at 130k miles. Got mechanic to do helicoil to get it home, but will not drive it until I replace with full threaded plugs and torque down those new plugs properly.
I'm here because my 2007 4.6 with 90K miles just blew a spark plug. I have a 2006 with 200k and it never has. Go figure.
The cal van kit just makes more sense and was engineered better
Thank you for taking your time to make these videos! I was going to have to machine my own alignment sleeves. Everyone pushes the other kits on the internet! My 2002 6.8 just rolled past 240k and this was the first event. Have a great one brother!
Can this kit do with out take off head like did in video
just subscribed...excellent video
Very grateful for this video. Thanks Ron. 🎯🎯🎯
Ford should have been sued over this expensive issue. All aluminum heads should have a steel insert installed by the manufacturer to start with. Plus that stupid cheap ass vvt timing deal with mile long timing chains. I hate these engines with a passion and would never buy one with that engine type.
Yeah I'm done with ford in general 😂😂😂
I'm here because a 2v 4.6l blew out a spark plug....it was in a 5.4l 3v truck, but I swapped it to 4.6 last year.
I think that an important feature that people aren't aware of is that ford changed the thread count after they consistently had problems with the plugs getting locked in on the heads. Kinda damned if you do damned if you don't scenario.
People listen and learn. Manufacturer's make errors when they make tons of products. There is a degree of error in manufacturing. But when you do service your engines. Always service them properly. Especially these babys.
I am not trying to be too argumentative because you are correct about the quality of the inserts, but the tap gets centered by the socket that just about fits the hole perfectly. I used the cheap kit before I saw this video. I had a different issue entirely. The tap had a size 19 mm hex head, but a 19 mm would not fit in the hole. The largest size that I could fit in the hole was 17 mm. I just resized the tap head and used a 17 mm deep well socket.
Working for a private fleet with a lot of 4.6's in vans, I saw constant blown out plugs. Now working for the county, I see a lot of plugs blow out of the crown vics with the 4.6 also.
Well I've seen and heard of a bunch of these engines doing this, and I for the life of me cannot believe that any vehicle manufacturer could, or would do anything so stupid. If I made a totem pole they would be so low on it you wouldn't even be able to see them because they would be on the portion burried under the ground....
I've got a 1998 F150 with a 4.6L at just over 122k miles. Just changed the plugs and so far so good, runs best it ever has since I purchased it 2 years ago.. Made sure to follow all recommended protocol and procedure in getting the job done so I am confident I did everything corrrectly but I am also cautiously optimistic that a failure won't happen on down the road given my propensity for bad luck lol... Expect the worst and hope for the best😆
From 6:10 to 6:20, when you shined the flashlight on the threads, you answered a question that's been bugging me since I learned of this plug blowout issue. Now, my only question is, WTF would they not tap drill it straight, instead of reamed tapered? Insane!
Anyway, I've owned an '06 Explorer w/ 3V 4.6L. Changed plugs twice during my 10 years of ownership. Faced the broken plug issue on #5. Lisle 65600 tool saved the day, and using impact to remove remaining plugs got it done without more issues.
Just purchased 2003 Expedition 5.4L, w/ 119K from S. Carolina, to replace our Ohio ravaged Explorer. My research led to the '03 Expedition to avoid the 3V problems, but I failed to learn about the plug launching problem till after the purchase! Still haven't taken delivery, but I'm already preparing to install inserts when I change plugs & coils. I'm betting this truck still has original parts still installed, but won't know for sure till it gets here. I'd like to drive this thing from here, near Cleveland, to Boston this summer, with peace of mind the trip won't be interrupted by a plug ejecting. Would installing 8 inserts be going overboard? How difficult is access to the rear plugs? No qualms about removing brackets & hoses, but not too keen on pulling fuel rail or intake.
Oh, BTW, thanks for al the videos. Subscribed!
Hi Ron ! Right on with the popcorn spark plugs. I have a 99 F-150 4.6lt V8 Triton . It has 267,484 miles on it . My dad was the other owner when bought new . Spark plugs have always blown, atleast every 3-4 years .
My 4.6 in my vic blew a spark plug twice it definitely happens all the time
Look the man said look intro my eyes "I'm here to help you with these problems" Ok i can dig that!
Ron you are absolutely correct on everything you said I paid a Ford dealer to repair my 2004 Ford excursion with 125K miles the #4 plugs blew out 3 years ago son took it to a Ford Dealer in Binghamton N.Y cost to put an insert was $1400.00 18 months later another Ford dealer claimed that they have to replace all coils and spark plugs YES the #4 cylinder because there were mis fires on the engine, cost $1100 heeemmmm O.K my son returns the truck to me which has 156K miles on it, I was happy to get my truck back after 3 years, I am a MECHANIC who were not able to make the repair since my son was too far away a few days ago I decided to check everything on my truck and everything you have explained in your video of what not to do is exactly what the FORD DEALERSHIPS DID the put the short thread sleeve and install the #4 plug after I remove the plug the entire plug and sleeve came out I will re-tap the spark plug well and use the Calvan sleeve. Stay STRONG.
It just happened to me I have 230. thousand miles on my 5.4
One problem that I see relates to dissimilar metals. Aluminum and steel or what ever the plugs are made from. Expand at different rates. That can allow for them to back out.
My 2008 Ford F-150XLT 4.6 L Blew No. 3 spark plug at 211,000 miles. Blew it completely out of the hole. I had the smell of gasoline for months before it blew. Unfortunately I was unaware of the problem aluminum heads in Ford and other manufacturers were having with blown spark plugs.
345k miles and just got my first one today lol :D was at DG and had it idling went in for less than 5 minutes come out and put it in R and "TRACTOR NOISE"!! Limped it home and here I am now lol
Can I humbly address the "brain fart" you had at 7:20? I don't want to freak you out but those memory glitches we have as we get older are preventable. While it is possible that toxic chemicals (plastics, food chemicals. environmental toxins) are to blame. It is much more likely that insulin resistance is to blame. Insulin resistance is a pre-diabetic condition that most people struggle with as a result of our carbohydrate-filled diet. That "brain fart" is actually an early stage of dementia, and most of us start having them beginning in our 30s or 40s. It is absolutely reversible with a change in diet, which we need to seriously consider because there are other physical issues that come with it. There are many doctors with videos here on RUclips but the most helpful videos come from Dr. Ken Berry. Dr. Berry's information comes from well executed studies and his information is dependable.
I have a 2003 F150 4.6L and had the #5 spark plug blow out yesterday. The tow truck driver was one of those “the 4.6L never blow plugs out” people to the point he was questioning as to whether or not I actually have a 4.6L. It didn’t look like any of the threads on the plug were damaged. Waiting to hear the verdict from the shop as I write this.
I blew a spark plug in Thanksgiving, I ended up driving it home with no power, bought the calvan kit and put the insert in the affected cylinder and solved my problem and still have 7 other inserts for when it happens again
And I drive a 2001 crown victoria with a 4.6
My 5.4 expo blew the 3rd sparkplug because water was leaking through the cowl directly onto it
I have a 2003 ford expedition. The spark plug blow out of the spark plug chamber.. 5.4 engine...
The 5.4 Triton comes in 2 variants. The 2 valve that can't keep spark plugs in. And the 3 valve that you can't get the plug out without it breaking. Cal van or big serts are the fix for the 2 valve and the broken ceramic plug kit is the cure for the 3 valve. Though I've had very good luck on the three valve engine by removing them with the engine still hot with an impact gun (not kidding, it really works the best).
Just got that kit and was so easy to use. Turned a annoying job into a breeze. Thanks for the video.
136k 2001 expedition 4.6L. Cylinder #3 blew out. Used the duralast kit from autozone, diy it let see how many miles I get 😂
lol my 4.6 blew the spark plug out on my 07 mercury grand marquis it happens
My 4.6 blew number 4. Yes, the DO. When I had the engine rebuilt, I had all 8 done. 4 threads are NOT eniugh, folks.
Well i came to this channel today because my 97 ford 4.6 Triton f150 blew out a spark plug .i was curious why it had done this since i change these plugs 2 yrs ago and had not had any problems. So thank for the informative video .
Hello thank you for all the info you provide us with your video's, just maybe when you can, can you comment if you recommend buying an RV with E450 v10 Triton Engine, we are thinking in buying one but all this problem with spark plugs blows up, we decided to put hold on this. Thank you very much, solong 🙏
Once again, you're telling the truth and giving us solutions and the history which is very beneficial to me. Thank you.
Great video, ty so much. i learned so much from your knowledge. you sir are a great mechanic. I am a garage, bike mechanic, learned how to do alot of wrenching myself, due to being cheap, and fixing it myself, when it breaks down . Cause you know what they say" H.D=Hundred Dollars! lol
I have to repair my M12 x 1.25 HD sparkplug hole, i had a TIME-SERT in there, and it walked out..why..lmao..CAUSE I TRYED TO REMOVE THE PLUG HOT/WARM!!. im going back in the whole with GREEN LOCTITE, and another SERT same size...wish me luck, ty again! work safe!
I recently bought a 98 e150 with the 4.6, however it doesn't have the coil on plug set up. I had a cylinder 3 misfire, changed the spark plug wire & the misfire stayed fixed for a few weeks. Recently the same cylinder misfired, the engine light was flashing but then stopped.
I cleared the code, fixed nothing, and the engine light hasn't come back on yet.
Could it be the spark plug is loose?
A problem with the coil on the other end of the wire.
Its easier to figure out when the problem is constant.
Any pointers for a new subscriber would be very appreciated.
Thank you sir I just use that kit from Amazon it works awesome I inherited a 2002 Mercury Mountaineer with the 4.6 V8 only has 90,000 miles on it and popped number three cylinder and it only took me 45 minutes to install that kit is awesome I can see why you recommend it and I recommend it highly just been the extra money for the kit
With 26000 miles on a 2007 F0ORD E450 RV (Class C, V10 6.8) would you just re-torque the plugs ?
I know this video is 4 yrs old and I'm incredibly thankful for it. Never knew about the sparkplug threading issue.
That said, can someone PLEASE take a look at my video? My 98 F-150 has a bad knocking and I don't know what's causing it. Do you think it could be the sparkplug?
I've already replaced the starter and oil. 3 years ago I replace the waterpump. The knocking started suddenly. I parked it late one night without issues and the next morning there was this bad knocking. My video is short and only shows the knocking sound from the cap and above the engine. Any legit advice would be greatly appreciated.
My video's title is: "HELP! Engine Knocking on '98 F-150 4.6 V8"
Ron fantastic info I was just looking for!!!
My town car has 54K miles just got it
I want to prevent this to happen what torque do you recommend to tighten the spark plugs?
Or just good and tight but not too tight??
Thank you!!
I've got a 2004 Expedition with the 4.6.....it's got 96,000 original miles on it and I'm scared to death to put in new plugs. I'm actually thinking of allowing the DEALER to do the job and I've
never in my life paid anyone to do plugs. I'm going to ASSUME because the plugs are original, they're OK.....we'll see. p.s. Never again a Ford product.
Great Video! ... Was really surprised of the amount of threads on the Ford heads .. Seems FORD screwed up on the depth of the head mill leaving only small amount of spark plug thread engagement. Real shame! Was wondering if you did the thread replacement on installed engines as I have seen in other videos.. If so how are you removing shavings inside the cylinder? As a mech I always added grease to the fluke of a reamer or tap to help retain shavings from dropping into a bore. Yet was wondering if you used a vacuum to remove any that may have dropped inside the cylinder. Thanks
Why do people buy this garbage? Why would anyone be loyal to a company that has continued to use poor design fully knowing there are problems? "Good engines" do not spit out spark plugs. Spark plugs blowing out of heads, CP4 high pressure fuel pumps, dual clutch transmissions, water pumps inside the crankcase, 6.0 & 6.4 diesels, Ecoboost head gaskets and carbon issues, 7.3 gas engines with lifter failure, you name it. All manufactures have issues but Ford takes it to a whole new level. This is all great news for mechanics and the aftermarket. Ford = Garbage.
Thanks God for Iron Blocks & Iron Cylinder Heads. So many problems avoided by Iron proven to work & doesn't have all the failure problems of Aluminum & Zombie engineers forget they are working with Aluminum. The only problem next is finding a new car/truck to fit my 35 year old1980's iron engine into. Oh yeah, Ford truck bodies---yeah Aluminum! UUUGH!
The 4.6 definitely blows the plug- on mine it is the number 3 (2003 Police Interceptor, 240k miles) ... I have repaired it several times using the save a thread- last time lasted about a month... One problem is you can get the save a thread to actually go too far- and I am hoping I can somehow get that insert out now without removing the head! I ordered the CalVan kit tonight, and hope to see it Tuesday. I will have to run my F-150 for the next few days... I pray this works as it is supposed to- My one question is about the insert itself- Is the wall thickness of the insert thicker than the save a thread, meaning will the reamer remove the threads for the save a thread and then allow the new threads cut deeper, or are they the same, meaning the reamer will be almost pointless, and the tap the same size...
I have never owned a Ford and never will just because of issues like this. Ford should be held accountable for this.
And no recall from Ford? No class action against them?
The 4.6 in my 2002 expedition blew out a plug at 225k miles. It was in the back on the passenger side. The plug had loosened and it was impossible to get a tap in there to try and get a plug back in it. It was 2 rusty to invest more than than in it...off to the JY. Bot a replacement 2011 expy w/ 107k miles and this vis makes me worry about that one!
My 2004 4.6 had a spark plug come loose. I guess one could say it "blew" out. Unfortunately, there was something that fell into the hole. It was intact. After replacing the plug, there was noise of an object down inside. I shutt it down removed the plug and found nothing. It's parked until I can tear it down and get whatever it is out. Car has 254,000! It was doing fine until this plug problem.
I have a 2000 E350 Superduty that has a 5.4Triton from factory so 2004 first year is incorrect.
All the vehicles that blow out plugs should have been recalled and fixed with good heads or the customers should have got their money back.
I can tell you now it does happen and it did it on me and my wife tonight 2000 4.6l mustang gt 5 spd number 2 cylinder on mine.😢😢😢 Only car right now lucky I had a few tools with me and a plastic bag to wrap around the threads. Forgot to mention just had other things fixed then this.
I bought a 99 Grand Marquis from a neighbor. I want to change the plugs, but I want to see if he changed the plugs and if he torqued them before I remove the plugs. It runs good now, maybe I shouldn't tempt fate. Maybe I should buy a Calvan kit before changing the plugs.🤔
Buy a new spark plug 1st and try to screw it in. You might still have threads and don't need a kit. Mine popped out at about 220,000 miles. I just bought new spark plug and screwed it in. It's still in
Is there a chance Ford overtorques or undertorques the #3 plug to make it an eventual failure, but an easy money maker for Ford dealer service departments? (It would be in keeping with their way of ensuring Ford dealers have some backroom revenue in a world of more and more nearly maintenance free passenger vehicles and longer lasting trucks.)
Just happened to tune in. I think you clearly explained the problem, especially helpful was the actual head showing the limited-depth spark plug holes. Man, Ford screwed up. This is why people like me, who prefer to support American made cars, have had to go Toyota and Honda which are at the top with respect to reliability. If I owned one of these Ford vehicles with this motor in it, and I wanted to keep it as long as possible, I would modify all plug holes with the tool you are recommending. Four thread only? That is both scary as the owner, and incompetent of Ford. Nice vid.
Just experienced my 3rd on a 2002 v10, presently at 110K. I've seen some information that these failures tend to happen off-throttle or on downhills. Latest event was creeping along in heavy traffic at about 20. Prior instances were just cruising, never on throttle. Thoughts?
So far on my V8 cyl 2,3 (put the calvan on 4 while I was back there also) and number 6 have blew out. Mine started at about 130k and the latest happened at 207K. Every one blew as I came up to a slow down to turn left and when I started to move into the turn the pop and surprise of what the hell just happened. I am thinking about replace all on this side while I have it apart. Oh and thans Ron for the great videos and caring about us common people. Times are real bad right now financially but hope to gift even a small amount.
I have a Ford F-150 2004 Truck , with a 4.6 litter engine and, yes, just blew a plug this week with me.
I'd buy a steak & Lobster dinner if someone could tell me the story of why and how FRAUD motor Corp. did what they did in putting such a major problem in their vehicles !! It makes ppl so angry.
Pre-ignition or detonation: If the engine experiences pre-ignition or detonation, it can create high pressure in the combustion chamber, causing the spark plug to be blown out. Improper heat range: Using spark plugs with an improper heat range for the engine can lead to overheating and subsequent blowout.
Don't own one, but got kids looking for used trucks. Have they ever released a newer head design (OEM or aftermarket) that solves this issue?
Thinking redesigned to give more threads....
98 Lincoln blew one. It looked like the electrode on the plug had been hit with a hammer. The plug hasn't been changed in years but otherwise looked good and cylinder compression was 120psi. What caused it to blow?
About 5 years ago my Town Car developed a tick noise with 280k miles on it on cold start up but would go away after the engine warmed up. I thought it sounded like a bad lifter of an exhaust manifold leak. Turned out #3 plug was loose but did not eject. I tightened it and to this day it's fine, no thread repair needed yet and has not come loose again. My kids car a Crown Vic started to make some noise and he ignored it. The plug ejected and damaged the coil in #1. We used the CalVan kit to repair it. He tells me after it was fixed that it's the e quietest it has ran for a long time. I always told him not ignore noises! He said he drove it for months making the noise before it blew out.