3186 3951 Iridium Spark Plugs 8pcs

I have a 2014 Lincoln MKZ and these works fine no more skip in engine.

I bought these spark plugs for our 2006 Mustang with a 4.6L engine. I put these in after changing the head gaskets , doing a valve job on them and timing chains. The engine started and ran. I shut it off and it never started again!. I spent a week troubleshooting the engine and determined that the spark plugs were misfiring or not firing at all!. I couldn't even get it to start using starting fluid!. I have never seen anything like this in 30 years of working on vehicles and I was a service tech at one time. So, I have seen just about everything. Another thing is that where the plug seats against the head, the distance is correct. however the threads will run deeper into the head which can lead to problems depending on if the bore is threaded deep enough. I ended up ordering OEM spark plugs. I put them in and the car started right up and runs like a new car. This particular ignition system relies on having very high quality plugs, where each plug has its own coil The plug on the right is one of the OEM plugs. The left plug is for this review. I hope to save someone the time and aggravation of what I went through.

Our poor truck is a 2001, with over 300,000 miles on it, so it needs some good plugs every so often. These went right in with no fuss, and seem to work just as well, as the name brand that we have been using before now. Since my engine burns oil, I need to take them out for cleaning about every other oil change, but they don't seem to have any issues. I am happy with them, and would use them again.

These sparkplugs work as expected and as described. A good value.

Exelete producto con el único detalle que abrieron la caja pero los artículos están intactos y no me queda más que agradecer. Muchas gracias!