Question about 2001 Ford Expedition

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I had a spark plug blow out. A helicoil was used to repair it and a new coil was also installed. Now it's running fine, no more missing,but every time I accelerate I notice a noise, like air escaping thru something or something of the sort. Any idea as to what it could be?

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Did they/you put teflon tape or sealer on helicoil? Sounds like pressure is leaking when under acceleration.

Posted on Jan 04, 2011


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1998 Honda oddysse blew a spark plug I want to use a heli coil to reseat the plug is there a thread size specific or any specifics I need to know when deciding what insert to buy

you will be looking for a plug thread specific heli coil and helicoil tap.
it should be metric and specific size
they are not the same as any other helicoil for general use

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Can I safely replace a spark plug where there's a helicoil already installed?

if the helicoil was installed correctly there should be no probs when done correct the coil replaces the origional thread and stays put should not come out when you remove the plug.

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I have a 2000toyota tocoma sr5 3.4 liter.... And one I the spark plugs came up with the boot and coil... When bought a new coil boot and spark plug and I cannot get the spark plug back in .... It seems to...

You can buy an insert kit and rethread the stripped head. Just be careful and get some pro help and advice when doing it . It's really not that difficult.

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How to replace a cylinder head on 2001 Ford Expedition 4.6 L V8

Actually, rather than replace the head, you can fix the spark plug hole with a "Time-Sert":

One thing they talk about on the site, "Ford spark plug blow-out? Repair kit part number 5553 Ford Triton spark plug kit will repair blown out spark plug's in Ford heads."
Here's the page for Ford's repair kits:

I've used these for years, and they work great!
Much better than a Helicoil, as the Time-Sert retains full thread strength!

But....I would STILL recommend removing the head to do this repair, so as to avoid metal chips/shavings from falling into the cylinder, but you'll save the cost of a new head!

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I have had issues with spark plugs blowing out of the head and i cant figure it out

thats an easy one. Who ever installed the plugs either tighten them too tight or cross thread them. That will cause them to come out from the compression of the piston
You will need to purchase a HELICOIL KIT to repair the plugs threaded hole
If its a cast iron head thge head wilol need to be removed
If aluminum head you can perform the installation right on the engine since aluminum is very soft and will exspell harmlessly through the engine
Read the instructions carefully if you do it yourself

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I have a stripped spark plug thread on my 1998 BMW

Your most cost effective solution is a Helicoil, A Timesert is about the same maybe a few dollars more but if will be a better fix than the Helicoil. The next two options are the used head or if it is being removed a machine shop could build up and redrill and thread the hole (like new). Myself I would probably be satisfied with a good installation of the time sert but it might be a time well spent to see how much another head or the machine shop repair is going to cost you.

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1997 ford expedition spark plug blow, its all strip. its an aluim head. is there a quick fix or do i have to replace the whole freaking heads?

The Spark Plug hole can be repaired. The professional way is to remove the cylinder head, and use a repair such as a Helicoil.

The spark plug hole is tapped out to a larger thread size, with a special Helicoil tap. Loctite or some other form of thread locker is applied, and the Helicoil is inserted.

Helicoil's are made of Stainless Steel, and are much better than the original material used in the cylinder head. (Be it cast iron or aluminum)
Drag racers use Helicoil's in their engines.

Tapping out the spark plug hole for a Helicoil, or using a special thread chaser, is NOT a good idea, while the cylinder head is still installed on the engine.
The tap creates chips of metal which fall down into the cylinder.
Using a vacuum to try to alleviate the chips, falls short of a good repair job.

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Multiple cylinder misfire

Carefully inspect the threads it sounds as if you have a crossthreaded hole that isn't allowing the plug to full seat. You'll need to get the proper size threading die and very carefully recut the threads. Best done in a shop as if anything falls into the cylinder your looking at very expensive repairs. It happens quite frequently with aluminium blocks and needs to be fixed as a spark plug popping out lets hot fuel dump into the engine compartment. Here is a description of such a tool at toolmonger.

It can happen to the best of us: one moment of inattention results in a cross-threaded spark plug hole. You can either install a helicoil and hope for the best, or send it out to have the whole shebang re-tapped. Now you have another option. The Back-Tap can fix that cross-threaded hole from the inside — without pulling the head.
The Back-Tap is a tap with expandable threads and a mandrel to catch errant metal shards. Apply a dab of grease to the mandrel, then place the device in the hole past the damaged threads. As you back it out, the cutters expand out to engage the undamaged threads, then gently reshape the damaged ones. The greased mandrel keeps metal filings from ending up in the cylinder.
The result: a task that could potentially take days and cost hundreds of dollars is done in minutes for less than a hundred bucks.
MAC offers a three-piece kit that includes a 10mm, 12mm, and 14mm Back-Tap for $90. You can buy Individual taps from various sources for about $50 each.

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