GM Genuine Parts D522C 12638824 Ignition Coil

used on my '08 chevy cobalt 2.2L. Was getting random misfires and rough idle occasionally. Wasnt enough to set check engine light,but using my Bluedriver scanner i could see ECM detected misfires was getting about 50 misfires per drive max and most of them were while engine was cold. I had 140,000 miles on my car and this took care of my problem. Gas mileage got way better after this too!! I like to use Stock ACDelco for spark plugs and coil packs. Car runs great now! I did spark plugs on my car right at 100,000 miles but decided to do them again while i had coil packs out. They are cheap and if your going through the works of taking these out might as well do the plugs too. Really easy to do on the cobalts! Read more

I have a 2009 Chevy HHR SS model. It has 93k on the clock and I have recently changed the serpentine belt as per the maintenance schedule. My brother is a mechanic and he uses some pretty neat tools I as a shade tree wrencher don't. One of the those tools is a red famous brand and read I had a misfiring cylinder, specifically #1. So I peruse Amazon and find these little gems. OE equipment and needless to say it fit like a glove. I spent more time removing the air cleaner housing than replacing these guys. Now I'm going to bring this bad-boy to s auto parts store and ask if the misfire code is still present. Fit well, seemed to improve power and acceleration, and was well priced. With the hassle of removing the air filter housing I spent the extra coin to just replace all four. Read more

Have a misfire? Before you start throwing parts at your car....do this. First, do yourself that favor and buy a obd2 bluetooth scanner. Download the torque app pro. Watch a couple of youtube videos on how to set it up and go from there. Now, I was having a bad misfire on a 09 malibu 2.4 with no misfire codes. Hooked up my scanner on it and watched for the real time misfire data. Confirmed! Cylinder 2 and 4 had a misfire. Now, what I did was swapped the coils (2 to 1 and 4 to 3) Confirmed! Now the cylinder misfire is now on 1 and 3. Which means I have 2 bad ignition coils. I went ahead a purchase all 4 for this car and changed it as soon as it came in. No more misfire. I also recommend buying the oem coils. Don't buy that chinese rubbish that is only going to last about six months if you're lucky. Read more

They worked as stated only one issue on ignition coil looked to be different than the other three and was missing the screw and rubber that holds the screw but I used one from the old one and it worked so far. Read more

Read if you are having misfires If your code is popping with a misfire in a specific cylinder then I recommend you follow the following troubleshooting steps. 1. Try the easiest things first! Swap first the coil pack between cylinders. If the misfire follows then you know it was the coil pack. If not then out the coil pack back. 2. Swap the spark plug. Also inspect the spark plug for signs of oil intrusion. Of the misfire follows then you know it was the spark plug, if now then return it to the original cylinder. 3. Next check the fuel injector port. The o ring that seals up that opening could cause a loss of compression if it has failed. 4. If none of those has worked then I recommend you buy a $10-15 compression test gauge on Amazon. Then perform a dry compression test on all cylinders. Watch a YouTube video to see how, it’s faintly easy. The compression test on all cylinders should be fairly close to each other. Of the cylinder that has misfires is significantly lower than the other cylinders, then that indicates a loss of compression. If that’s the case then perform a wet compression test on the problem cylinder. It’s the same procedure except you put a couple tablespoons of motor oil into that cylinder then repertory the compression test. If the wet test improves the compression of that problem cylinder then that suggests failed or degraded piston rings. 5. If all previous tests pass, then inspect the head gasket for signs of leaking. 6. If all else finds no fault the that would suggest that the problem lies in the cylinder. *** If you proceed beyond this point you will disturb the timing, please ensure you know how to reset the timing before proceeding. *** likely Either a failed valve or valve spring. Remove head assembly and inspect the valves for signs of blow by. Remove the valves and springs and inspect for damage. Replace as necessary. 7. Smile because you just saved yourself thousands of dollars. Read more

Good fit and working Read more

These are the OEM coil packs. There from AcDelco but the maker is Denso AMAZING coil packs!!!! WORTH THE PRICE, TRUST ME.. look up the part number at Autozone or Dealership there tripple the price! Read more

First off, I received AC Delco as advertised. We had the P0303 misfire with our 2010 Chevy HHR. I first changed all the spark plugs and that didn't resolve. I just replaced coil #3 with this, and so far so good. What I like about this goes beyond the part itself. Obviously I like that I was easily able to go online and find that this was the likely issue. I like that Amazon had it, in stock, for $20, and I had it in my hands two days later. I like that I was able to do this myself. I like that knowing I saved a lot of time and money versus taking it to Chevy or a local mechanic. I am certain that rather than simply changing the spark plugs and coil #3, they would have replaced all the coils, charged $50 or more for each, and then another $200 or more for labor. For $20, since these are so inexpensive, I may well order another three and replace the other coils. However, the fact that I can buy just one and do the replacement in 15 minutes is a joy. Read more