ACDelco Professional 41-103 (12625058) Iridium Spark Plug (Pack of 1)

Buying Iridium Spark Plugs online is often a horror show with some estimates being that 60% of them are counterfeit. I have learned this the hard way having to re-replace a set of fakes that required the intake manifold to be pulled in order to change the plugs. I was very pleased when I received these, performed all the checks and tests on them and found them to be genuine AC Delco plugs. I even examined the Iridium tip under a microscope. High quality at a very reasonable price, 5 Stars.

Update- after driving for a week I developed a mis fire in #6, I had replaced the coils when I did the plugs, put an old coil on 6, still P0306, bought a new coil for 6, finally after checking the fuel pressure, I was going to check compression- when I found the #6 plug had .020 gap and didnt look like the other week old plugs, bought another delco plug locally and replaced it - car runs great now - recheck the gaps and lay all the plugs out and make sure the electrodes all look the same. My 100k and 200k miles spark plugs, they came gapped almost exactly right, it take quality to last 100k miles and they have once already

Works great

Works. What else can I say? Spark plugs, it is what it is.

As described. Right fit, right price, right purchase!

The part number appearing on the cartoon box is different than the one appearing on the spark plug. Although the box should match the item, I can see that the item still fits. Also, all 6 items were delivered without full plastic cylinder similar to the one I bought in the past as shown in the picture of my previously purchased item. This predisposes the poorly protected plug's gap to damage during shipping.

Installed these in my wife's HHR with 2.4L. The plugs that came out were Autolites installed by a previous owner. The plugs were very slow/difficult to spin out once loosened - to the point that I thought there might be a problem with the threads. As the plugs came out, I could see that the threads on the plugs were shiny and dull on the crowns of the threads telling me that the QA/QC on these Autolite plugs was poor, and they were maybe a couple thousandths too large causing a very tight fit on the thread mating surfaces. When comparing them to the new AC Delco plugs, I could see that the tips of the electrodes were totally eaten away in varying amounts on each plug causing very large plug gaps - no wonder I was getting misfire codes. I installed the new AC Delco plugs and they threaded in MUCH easier. After reassembly, the engine fired instantly and ran much smoother at idle. I cleared the misfire codes and they have not returned. In short, if you want your GM car to run well - spend the literal couple of extra $ and get AC Delco plugs. They are the plugs your car was designed to operate with from the factory.

Perfect fit for my 2006 Pontiac Solstice. Easy installation. Car runs great.

Works as it should PERFECTLY!!

I bought these spark plugs for my 2006 Chevrolet Trailblazer on Jun 2022 and I kept them as spare for my car. Today I decided to replaced my spark plugs and one of these new spark plugs broken while tightening! The quality of these new spark plugs is not as supposed to be and now I have to spend hundreds to fix my car.

buenas bujias originales de GM

I've learned over fifty years of car ownership and self-maintenance that the best spark plugs to buy are the exact ones that the car was built with. Nothing else. Ignore the fancy claims as "platinum" or "Iridium" etc as they are still a compromise plug. Extra cost of the fancy ones notwithstanding.

Muy buena compra, están por debajo del precio estándar en las refaccionarías