Delphi DS1004 Ignition Control Module

At about 60,000 miles, our 2005 Buick LeSabre Limited V-6 suddenly stopped firing on two cylinders. The check engine soon light illuminated. A check of each of the three coils showed one coil position was inoperative. Exchanging two coils did not change the position of the inoperative coil. Replacement of the Ignition Control Module was the next logical step and that corrected the problem. Two days of driving later, the check engine soon light went out.Using an original equipment component is the most reliable way to correct an ignition problem. In this instance, it worked well.The Delphi product is satisfactory.Here it is, already October 21, 2016. A few days ago, the new Delphi engine control module failed in our 2005 Buick LeSabre. The lower coil position failed, not the center one as last time. So, it was good for about three years. I am ordering another one and hoping for at least another three years of service. It should be noted that there are several factors external to the Ignition control module that can cause them to fail. The most prominent one is too high a voltage from the alternator. That in itself is not unusual to find in one of these LeSabres. Our Alternator voltage runs at the high end of the recommended range. Almost all of our driving is comprised of drives of less than 25 miles.....

This ICM is a breeze to install - be sure to coat the bottom with the supplied thermal grease. This LeSabre was idling rough and sometimes shifted very hard into 2nd gear, whether upshifting or downshifting. I suspected a bad ICM, especially since the hard shifting happened when it was hot. After installation (along with new plugs, wires, coils and the ICM) this car is running like new! It shifts smoothly going up and down gears and idles quietly. Delphi is a quality aftermarket supplier and manufactures many GM parts. A safe prospect considering the price of the ACDelco part.

It fit right on the car...good product

The ignition module works great. It was fairly easy to install but be sure and follow the directions as it’s important to apply the special thermo grease as directed! There isn’t much but just barely enough so be sure and get every last bit of it out of the packet

Product was great. Used for snow blower

I was really surprised to get that part right the first time and that was the whole problem with the car I did not know it even existed on the car the manual did not say it was there found it by accident had an idea because of coil was not getting any juice power if you will thank you very much keep it up

Great price and very fast shipping! Product included the dielectric grease packet and was very easy to install.

**Updated review at the end**My Buick Lesabre lost 2 cylinders of spark while my wife was on her way home from work. She limped it to a parking lot and called me to save her. I was able to identify the 2 cylinders, and disconnected the power to those 2 fuel injectors so no fuel would be pumped to those 2 cylinders, and drove it home on the remaining 4 cylinders. Since both cylinders that were out were from the same coil pack (each coil pack fires 2 cylinders) I quickly assumed a coil pack was bad, and bought one on the way home to install. Needless to say my diagnosis was hasty, and after I installed the new coil pack I still had no spark. Somewhat in disbelief I switched 2 coil packs around to see if the no spark would follow the coil pack or stay with the cylinders. It indeed did not follow the coil pack, and I should have done this test first before buying any parts. Lesson learned, and a tip to share with all of you. Luckily I was able to return the coil pack without a problem.So I was off to the internet to figure out the next likely cause, and while many possible causes are listed on the internet, the only one that really made sense was the ignition control module (ICM) being bad, however rare many claim this problem to be. I found a suggestion to measure the resistance of the contacts on the module that powers each of the 3 coils. Indeed the resistance of the location that was not firing was significantly different than the other 2 that were still working fine. (I regret forgetting what the measurement was, but I assure you it was obvious it had died). This was about the extent of the troubleshooting help I could find regarding the ICM, so I took the chance and ordered one based on this resistance reading and my previous troubleshooting of switching known good coils to the problem location.I am happy to report this ICM did the trick, and has been working great now for about 5,000 miles and counting. Hopefully my experience will help someone else troubleshoot a similar condition, and hopefully you did not needlessly buy a coil pack too.EDIT: Shortly after writing this review, the ICM developed an internal failure and died. I replaced it, hoping this was a fluke. Unfortunately these are made in China. The replacement (same Delphi) has a few thousand miles on it now and counting. I will update with a major reduction in rating if this replacement also fails. But so far so good. I was conflicted with sticking with OEM parts and trying to find a non-China replacement. Hoping I do not regret my choice to stay with OEM.2nd EDIT: The second replacement of this Delphi ICM only lasted 5 months and a hair over 8,000 miles. It failed in the same manner as the first unit, which is that the whole unit stopped responding and none of the coil packs were being fired. The only good thing about the failure this time is that it gave me a warning a day before it failed by stalling the car while driving 50 MPH (shut off spark). The car restarted and ran for the rest of the day, and then the next day it failed on me completely (would not restart - no spark). When it gave me the warning I put my original OEM ICM and some tools in the trunk. When it failed I was able to put the original OEM unit back on and bypass the 2 bad cylinders again like before and drove it to Autozone where I bought one of their Duralast ICM's (they said made by Wells) and it reports to be Made In The USA and also carries a lifetime warranty. Everything is running fine again with the new ICM, and hopefully this is the end of this headache. Generally ICM's are known to have an extremely low failure rate on vehicles, many people never have to replace their ICM on their vehicles even after 200,000+ miles. For me to have to replace 2 in less than a year is a blatent sign that something is wrong with the manufacturing of these Delphi units, and I would steer clear of them if I were you. It pains me to say that as a loyal GM fanboy, but that is my experience.3rd EDIT: Just to update, Over 15,000 miles (10+ months) and counting on the Duralast (Wells) ICM with no problems yet.4th EDIT: Just under 51,000 miles and over 2 years later and the Duralast ICM just gave out. It failed in the same manner as my OEM unit, where it stopped firing one of the coil packs, but still fired the other 2.