Blew a plug Christmas, and have had the truck back for a little over a day. I haven't been running it hard and I've been letting it warm up. The auto place that put in the coil basically said don't touch that plug. I'm still wary of reblowing it out, considering they said that they could not guarentee it would stay in.

What's everyone elses experiences with the coils? Mostly good I hope

 

The helicoil should be as strong or stronger than the original connection. I'd be worried about blowing out the other plugs before the helicoil failed.

 

a helicoil isn't a very good fix. If they used an insert then that is stronger than the original threads. i fixed mine like many others with a Timesert Kit
I have over 20k miles on my insert. I hope you do also

 

i have used one before on a spindle on a SUV that holds the calipers in place, its still doing great after 10k, but however im not sure what generates more heat, brakes or the engine.

 

You can consider a helicoiling a permanent repair.

-fatz

 

A helicoil, done correctly, is usually as strong if not stronger than the original threads that the coil is replacing. I've never had one fail on me and I've done dozens of them...

 

I too use them at work, they hold as much torque as before, but our spark plugs need to seal the combustion chamber. Our style of plugs use a taper on the bottom to seal against a taper on the head. if you install a helicoil the you remove or at least damage that taper. You are now relying on the threads to seal it.

 

If the coil is installed correctly and there is enough metal to thread the coil into it is stronger then the original thread in aluminum.

I've used many of them on bikes and we use them at my shop on cars and trucks all the time.