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Ford 4.6L V-8

01/01/2013 10:33 AM

I've got a 4.6 in an F-150 (2000) that just spit out a spark plug last night. From what I understand they will sometimes strip out and eject themselves, or they sometimes literally come apart and shoot the porcelaine section out while swallowing the electrode and leaving the outer housing intact. I can't get my head in close enough to see if there are any remains, and can't find any peices under the hood to determine what happened for sure. Does anyone have any suggestions?

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#1

Re: Ford 4.6L V-8

01/01/2013 10:41 AM

I'd use a fiber optic bore scope to look for debris.

Fibre optics, optic fiberscopes and micro endoscopes

Or something similar.

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#2

Re: Ford 4.6L V-8

01/01/2013 11:07 AM

I'd start with trying to use a spark plug socket wrench to remove the threaded plug remains. If there is no threaded part left then you maybe lucky that the spark plug was just not properly tightened and that the plug just slowly worked itself out first until an ignition could blow the plug out the last little bit. (IMHO the most likely scenario.) If the threaded part comes out then examine it for any tell tale signs of this failure. I seriously doubt anything will fall into a cylinder while it is blowing out a spark plug. Only a disassembly of that head will prove or disprove if debris damaged things. I take that back. A compression check should tell if damage has happened. A side viewing bore scope might allow an inspection without removing the head. I'd be most concerned with the condition of the spark plug threads in the head.

If you do not have a spark plug socket, stop! You do not have the skill and tool set to work on an engine. Hire a good mechanic.

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#3

Re: Ford 4.6L V-8

01/01/2013 11:25 AM

What remains attached to that spark plug wire. The one time I blew out a spark plug (stripped threads in an Al. head) it remained attached to the plug wire.

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#4

Re: Ford 4.6L V-8

01/01/2013 11:26 AM

I dout your threads are gone, I'd think you just need a new one....or6. I'd suggest a small hand held mirror and a flash light, can you post a pic? can you get close enough for that?

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#5
In reply to #4

Re: Ford 4.6L V-8

01/01/2013 11:57 AM

Another use for duct tape.

In similar situations, I have used hoses and duct tape to graduate down the hose on my shop vac to the size that will fit in the hole. Just bring the piston up to the top of the stroke first.

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#6
In reply to #5

Re: Ford 4.6L V-8

01/01/2013 12:02 PM

if I understand him right, he wants to verify "something" is left...then take it out, so he can replace the blown plug......I doubt he'll be looking at a helicoil, but he won know until he gets a good look

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#7

Re: Ford 4.6L V-8

01/01/2013 1:33 PM

The Ford 4.6 l V8 didn't have a lot of problems with blowing spark plugs out due to lack of threads in the heads. The 6.8 l V10 however did. I have two of both engines.

Its possible though that it did have a weak thread job in the head however but without being able to see what happened we cant really say for sure.

Is your engine a coil on plug type or common coil pack type with actual plug wires. Ford made the 4.6 in both versions.

If you lost the plug due to bad threads then yes you will need a heli coil job done which if so removing the head is necessary or at least highly recommended.

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#8

Re: Ford 4.6L V-8

01/01/2013 3:18 PM

I think I might just try to install a new plug first...If it screws in and feels secure, then maybe you got lucky....If not then a repair is in order....

...The heli-coil repair is not usually reliable or long lasting....The time-sert thread sleeve works well, and is a permanent repair....

Here is a blurb...

"

The Timesert kit is very well designed and comes with clear instructions. If you are wondering if you can do this, I'd say

anyone that can take their time and follow the instructions should not have any problem.

There were few things that I did to make the repair a little easier: 1. My friend works at a shop where he was able to

borrow a Snap-On borescope camera. I used it to make sure that both valves were closed and the piston was at BDC before I

started any of the work.

2. I used lots of grease, and during the first two steps (cutting the counterbore and reaming the hole) I removed the tool

often to clear the chips and refill the grooves with fresh grease.

3. I used a 3/8" air ratchet to turn the cutting tool for the reaming step. For all other steps I turned the cutting tools

by hand so that I could feel what was happening. (One of my first jobs was working for a shop foreman who had been a

machinist and he insisted that I always take my time and "feel" the threads and torque of nuts, bolts, and taps while

working, not just crank down on it with on the largest wrench I could find. :-)

4. I used a funnel and a length of tubing to make shop-vac hose extension to vacuum the cylinder for chips when all the

cutting was done. Even with the frequent grease changes, some chips still made it into the cylinder. My vacuum rig picked

them up. (See pics below.) You can see the stuff that it picked up from the cylinder in the second pic. I thought I would

have to tape the end of the shop-vac hose to the funnel, but the suction held it here just fine. The small clear hose was

fastened to the funnel with Gorilla tape. "

http://www.timesert.com/html/triton_repair2.html

http://www.f150online.com/forums/v8-engines/103042-living-ford-spark-plug-blow-out-problem-23.html

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#9

Re: Ford 4.6L V-8

01/01/2013 11:23 PM

If you have to rethread the plug hole, try this.

Make a air hose adapter from an old plug by breaking out all of the porcelain and brazing a quick-connect air fitting to it.Insert it into the plug hole next to the one on which you will be working. Apply compressed air to the adapter.Rotate the engine manually until air is blowing from the damaged hole of the adjacent cylinder at maximum rate.This will keep debri out of the plug hole while you rethread it.If you cannot get air flow from the damaged cylinder, locate the next sequential firing order cylinder and try applying air pressure there.

There will be a cylinder where the two valve sets overlap.

I have used this method and it works.Just go slow and don't force the tap or reamer.

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#10

Re: Ford 4.6L V-8

01/02/2013 3:16 AM

tcmtech I believe you are mistaken on the subject of the 4.6 not having a problem with thread retention. I personally have two sets of heads that have had the threads helicoiled because of someone in the past not applying anti-seize on the threads. A very good friend of mine makes a reasonable profit on helicoiling these heads 4V or 2V but not so many 3V heads. One of his biggest complaints is that on most of these heads there is only 3 to 3.5 threads holding the plug in and if you forget to anti-seize the threads the next time you remove the plugs, you will almost invariably remove the threads as well on a few cylinders a good part of the time. We are currently running 45 lbs of boost and we have learned to weld the area around the plug holes then helicoil them for more threads and no more problems. Actually I am wrong we are NOT using helicoils we are using an insert that is all one piece like a threadsert made for this type of repair. As my antique memory at this late hour is failing me someone looking over my shoulder reminded me that we switched over to the inserts when we started having problems with the helicoils this has stopped plug loss and holes in the fender of my Mark VIII Lincoln. At 200 mph there is a lot of cylinder pressure but no more lost plugs or extra holes to explain to the wife who thinks someone is shooting at us with holes in the fenders the only problem with her theory is that the holes are from the inside out. Duke.

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#11

Re: Ford 4.6L V-8

01/02/2013 5:08 AM

I'd never heard of this happening in any vehicle until My Chevy had this happen. The Mechanic was surprised when I called and told him it was a Chevy and not a Ford product.

They put in a heli-coil. I didn't know there was an alternative method of fixing this problem. Unfortunately I have no way of telling you how long the heli-coil will last. My wife wrecked the car soon after we got it back.

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#12

Re: Ford 4.6L V-8

01/02/2013 6:02 AM

I want to thank you all for your input. I'm meeting up with a friend tonight who has had this same problem on 4 different 4.6L 3 valve engines in the past. He's a fleet mechanic for a company that owns 10 trucks with the same engine. He's got a boroscope and some specialty tools from Lisle that are made specifically for this issue. He says that depending on the actual problem that there are the obvious heli coils, but there are also plugs that have a "thread chaser" thread that is slightly oversized so that it can recut threads and still stay in place.

I'll keep you all posted, and thank you again for sharing your knowledge.

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#13
In reply to #12

Re: Ford 4.6L V-8

01/02/2013 6:58 AM

good luck, hopefully the threads are still good and it was just a plug failure

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#14

Re: Ford 4.6L V-8

01/02/2013 7:53 AM

Well I have to tell you that Ford has a problem with their heads from 1997 thru 2000, it seems that the manufacturer that they had produce these items only tapped down 3 threads. We had a similar problem when my husband decided to do a tune up on our 1999 Ford. When I did a search to find out how much torq to use when re-installing the plugs, I was shocked to find out that no one had an answer because of the faulty heads. I spent 2 hours at a Ford dealers service department with all these questions, and they also had no answer. They have a fix for this problem but it is not a warranty issue, and you have to remove the heads, re-bore and sleeve and tap them. It is a lengthy and costly process. Here is an ad describing the problem.

General Issues: Ford's Spit-Out Spark Plugs Hit Mechanics in their Wallets


Company Covers Up Problem, Lets Consumers, Mechanics Pick Up the Tab
By Joe Benton
ConsumerAffairs.Com

May 31, 2007

More and more Ford mechanics and technicians are siding with consumers, charging that the troubled automaker is fully aware of a major flaw in Ford engines that causes the power plant to spit out spark plugs at random and without warning.

They complain that Ford is covering up the defect while squeezing and short-changing technicians and mechanics tasked with repairing the problem for Ford consumers.


The trouble is, no one is listening to the warning and Ford continues to stonewall and cover up the spit spark plug hazard, according to Ford technicians and mechanics.

Ford did not respond to requests for comment.

The spit plug is both costly to repair and a safety hazard for people riding in the Ford truck as well as those nearby. Several Ford vehicles have burst into flames following a spit plug.

A Master Ford Technician at a dealership in Georgia told ConsumerAffairs.Com that the "situation regarding these engines and the spark plugs blowing out is not unknown to Ford."

"Quite the contrary, they are well aware of it and have been since the 5.4 liter Triton engine was released," this Ford mechanic said. "This same concern also affects other engines in Ford's modular engine family, such as the 4.6 liter single overhead cam V-8s and the 6.8 liter single overhead cam V-10," he warned.

Ford dealerships routinely insist to consumers complaining about a spit spark plug that they have never heard of such a thing happening.

A second Ford technician confirmed to ConsumerAffairs.Com that, "Ford has known about this problem since the first year the Triton V-8 was introduced. I encountered my first one in 1997 on a '97 F150 with 30,000 miles on it. At the time, I thought it was a fluke, partially due to the high mileage (30,000 in less than six months)."

All of the Ford technicians insisted that their names and cities not be used, fearing they would be fired for speaking publicly about the problem.




Not a Fluke
But the spit plug was clearly not a fluke.

"After several more engines with the same problem, I realized that Ford had a pretty serious issue with the Triton. As per Ford's usual method of letting the customer be the guinea pigs for their new models, I expected the '98 model to have updated heads. The heads were not updated in '98, or '99, or 2000, or ever as far as I know," this Kentucky Ford mechanic told us.

"I feel that Ford determined that it would be cheaper to repair the engines that had the concern during the warranty period, then if they did make it out of warranty it's on the customer's dime," he said.

It is not unusual for mechanics to encounter the spit spark plug failure in their own Ford truck.

"My own personal 1997 Ford F250 Light Duty pickup with the 5.4 liter Triton engine suffered a spark plug blow-out which cost me over $700 in parts to repair at my cost." a technician wrote ConsumerAffairs.Com.

He explained why the repair work is so expensive. "Ford does not authorize any type of thread repair to correct this concern. Instead, they insist that the cylinder head be replaced."

"Typically these failures occur far out of the vehicle's warranty, which leaves the customer responsible for several hundred or even thousands of dollars worth of repairs. Repairs that they had no idea that they would be facing, repairs that they shouldn't be facing," he said.
Flat-Rate Rip Off

Ford mechanics and technicians complain that if the truck is under warranty, Ford has instituted a repair procedure that technicians insist is unrealistic.

"Ford adheres to an unrealistic and unproven labor time guide to determine how much time, or flat-rate hours, the technician should be paid. The technician typically cannot complete the repairs satisfactorily in the allotted time per Ford's labor time guide. That means one of two things, either the technician sucks it up and repairs the vehicle properly despite how much they may or may not be getting paid, or the technician takes short cuts and possibly compromises the repair," mechanics said.

Either way is bad news for consumers. "The warranty labor time guide has been steadily altered and cut back since about 1999, under what Ford called the Re-Engineering of Service Labor Time Standards," one technician said.

"Technicians across the country have filed requests for review for labor times and operations and have requested the video transcripts of the repairs performed as by the SLTS group to see how it's done. All these requests have fallen on deaf ears at Ford," people familiar with the situation said.

"As a result of these cutbacks, it is becoming increasingly difficult for technicians such as myself to maintain financial security for ourselves and our families working under the charge of Ford Motor Company at dealerships across the country," a Ford technician told ConsumerAffairs.Com.

"In addition, the quality of repairs that the customer may receive could be compromised as well, due to the insufficient time provided to perform certain repairs in question."

The impact on Ford mechanics is equivalent to a 30 percent pay cut.

"A tech earning $30,000 a year suddenly found they were making $21,000 A Senior Master Tech that was earning $60,000 overnight was earning $42,000," according to a Ford technician in Mississippi.
Ripping Off Mechanics

Here is an example of how Ford is ripping off it's own mechanics according to a source who has seen hundreds of Ford trucks with spit spark plugs.

"In order to do a quality repair, the cylinder head needs to be replaced. Ford pays between 5 and 6 hours to replace a cylinder head. Imagine you were a technician and you came in one morning to find an F150 in the drive and the service writer tells you, "there's your first job, it needs a cylinder head," a former Ford Senior Master Technician told ConsumerAffairs.Com.

"So now you have to remove the entire cab of the truck and all the various components, strip down the entire top and front of the engine to get to the cylinder head, remove the head, clean, inspect and measure the block and cylinders, transfer all the parts from the old head to the new one, reinstall, re-time the chains, re-torque the new head bolts, put everything back on the engine, refill all the fluids, put the cab back on and reattach everything, test drive it, and in most cases, wash the engine bay...."

"And, oh yeah, if it's still in your stall after lunch - you get to finish it up with no pay," he told us. "Welcome to the Flat Rate Pay System."
Consumer Pays Either Way

Like anything else, our Ford technical sources said, it is the consumer who ends up paying the freight in the end.

And here is how that rip off occurs.

"A customer brings in their vehicle for their prescribed service interval. Perhaps an oil change? The oil change that would cost somewhere between 20 and 30 bucks," a Ford technician he explained.

"The tech informs the customer that he has checked the vehicle from top to bottom and discovered his transmission fluid is in dire need of changing. 'You must have severe driving to do? How much will that cost? 100 to 200 bucks plus!' Or, 'Oh my lord! I am so glad you brought this in when you did! I pulled the inspection plate and your brakes are at the minimum specs. They need replacing practically immediately!' Sadly these scenarios are occurring daily across the land." our technician told ConsumerAffairs.Com.

The mechanics are using what is known in the trade as "customer pay" to supplement what the manufacturer pays.

"Yes many customers are stupid," one mechanic scolded. "They have no clue as to whether they have an alternator in their vehicle or halogen fluid in their headlights. But as Abraham Lincoln once said, you can fool some of the people all the time and you can fool all of the people some of the time. Well the slashing of the SLTS has caused many dealerships and techs to try and fool all of the people all of the time."

"Problem is customers aren't as ignorant as you would hope for."

I'm sorry to be the bearer of bad tidings, but I hope all this info helps. Good Luck.

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#19
In reply to #14

Re: Ford 4.6L V-8

01/06/2013 12:09 PM

I bought new plugs for my 97 E150 5.4 a few years ago, but returned them after some research revealed this nightmare. I have 187,000 miles on it and the plugs have never been replaced. It still runs fine. I will probably never change the plugs.

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#15

Re: Ford 4.6L V-8

01/02/2013 8:52 AM

This is a common problem on some Fords. Companies like Lisle make special tools for this job. Otherwise some repair shops will do this for your car.

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#16

Re: Ford 4.6L V-8

01/02/2013 10:42 AM

There are tools on the market that were designed specifically for the Ford modular engine and its problem spark plug holes. The tool is a rethreading tool that fits into the damaged plug hole, is then tightened in a fashion that brings the cutting teeth into contact with the bottom of the damaged hole where there are usually still good threads. Then the tool is turned with a socket, and it re-threads the plug hole from the bottom up. Thus pulling the small chips up and out with the re-threader.

This tool combined with the other ideas here will avoid the removal of the head for rethreading.

The most important thing for you though is to find out exactly what is missing and what remains in your engine. It could be the entire spark plug, just the porcelain, or the metal shell (with the hex section) may have broken off. The last is particularly hard to repair. Good luck.

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#17

Re: Ford 4.6L V-8

01/02/2013 10:44 AM

A note about aluminum heads:NEVER remove or replace spark plugs in a hot engine.This can take the threads right out of the head.Could be due to different expansion ratio between steel plug and aluminum, or other factors.I only know that it happens.Always change them when engine is cold.

A side note:

During the 1960's, Buick had a problem with the rear freeze plug on their V8 engines.It was not accessible unless the engine was removed.A dealer wanted big bucks for this repair.$200.00 Plus

A savvy local mechanic pulled back the carpet behind the firewall, bored a hole exactly behind the freeze plug, removed and replaced the plug through the hole.

He used a conduit knock-out plug to fill the hole, coated it with roof tar, and inserted it into the "access hole",replaced carpet to original position, and was done in less than 30 minutes.His charge?$50.00

He made a decent living doing nothing but freeze plugs for a long time.

"All the engineers ain't in Detroit" he used to say.

Still true today.Dealers always take the long way around to service a vehicle.

I used to work for a dealer, so I know.

I NEVER take a new vehicle to the dealer for service.I do my own service work,or have it done by a local mechanic of personal knowledge of his work standards and ethics.

I have never failed to get good service from my vehicles, 250,000+ miles each,and they were in excellent condition when I sold them.

Sorry to see Ford, the last bastion of American Quality, taking a nose dive.

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#18
In reply to #17

Re: Ford 4.6L V-8

01/02/2013 12:35 PM

Part of the problem with the spark plugs is the fact that the engines run so good for so long that plugs may start to become a non wear item. When the plugs were replaced every 6 to 10 thousand miles, there was only so much metal corrosion going on. But with today's extended mileage, the plug may be in for ten years without being disturbed. The engineers may need to allow more thread contact area for these extended life plugs. JMHO.

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#20

Re: Ford 4.6L V-8

01/06/2013 5:47 PM

Well, I said I'd update you all. The plug was gone completely, not a sign of it. The scope showed nothing in the cylinder (either damage or debris). The threads were buggered up a little, but a thread chaser was used and an oversized special plug, and again it runs like a champ. It only took about 45 minutes to do. The parts and chaser were just about $90, so it wasn't really too bad.

Again, I thank you all for your input, and I'll probably leave the rest of the plugs in until they don't fire any more.

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#21
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Re: Ford 4.6L V-8

01/08/2013 7:34 AM

Thanks for taking the time to let us know.

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