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.

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

It fits perfectly in my 2008 Chevrolet Colorado truck, good quality !!!!

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.

2004 GMC Envoy XUV . I tried to go cheaper but i ended up having to get these as the correct replacemet part. This is somewhat complicated due to the original plug 41-981 Platinum plug was discontinued and replaced with these 41-103 plug was hard to get to so i think whatever mechanic did the first tune up left the original in there. So theres alot of plugs that wont fit right that will say they are correct wont fire or are not the correct quality and the first plugs i ordered did not even fire. So In Short In This Case I Would not try to go cheap and Go With These AC Delco plugs they fired immeditely and correctly.

I bought 6 of these and the mfg says to NOT set the gap on iridium plugs. They're set at the factory. BS. After installing them and trusting they were gapped correctly at the factory, I had a random misfire. Turns out one plug gap was so bad it was almost closed. Otherwise, the car runs great and gets better mpg over the old plugs.

Just do it yourself to save a hundred bucks at least. Happy customer here.

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.

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.

buenas bujias originales de GM

All plugs were properly gapped... Worked great

These are spark plugs of very good quality.