Delphi DS1004 Ignition Control Module

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Price: $130.74    

Product Feature

• Delphi Ignition Modules contain the OE Chips needed to correctly communicate with the ECM

Product Description

Delphi is an original equipment brand that partners with other manufacturers to supply the parts your car was originally built with. This product is in a Delphi package, note that the part may have been manufactured by an independent Delphi supplier.

Delphi DS1004 Ignition Control Module Review

**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.

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