Ed Hall Posted May 25, 2008 Report Share Posted May 25, 2008 This is post is regarding my 1993 Allante with a 4.6 Northstar engine with 64k on the odometer. My 2nd coil in less than 1000 miles took a dump this morning. The engine suddenly lost a lot of power and ran rough and it's symptoms were exactly the same as when the 1st coil went out so I knew instantly what was the problem. While the engine was still idling, I popped off one spark plug at a time and found the coil that was not producing spark on 2 of the cylinders. Here is my question. Are my coils going due to: 1.) coincidence 2.) defective quality coils 3.) age or the coils 4.) something else causing the coils to burn out (MSD wires) After my 1st coil went out, I installed a new coil but the engine continued to cough and buck at low rpms / high throttle positions. It also ran rough at idle. So I made a set of custom made MSD 8.5mm wires and that took care of the coughing and bucking but it did not take care of the rough idle. I also re gapped my A/C Delco plugs (from .065 to .045) and that made no difference. Anyways, the idle has gotten worse and it has degraded to the point that I just turn off the engine at stoplights. I also get no more than 10 mpg around town. Could my MSD wires be hastening the death of these coils? Also, I have heard that these coils go out fairly frequently. Is there a better brand of coils out there? I'm not too impressed with AC Delco if I can only get 60k out of them. I replaced the 1st defective coil with an Autozone el cheapo coil. So far it seems to be fine. There are also other brands such as Accel and MSD. If the originals are at their end of lifespan, I might as well replace them all hopefully with something that'll last longer. http://www.jegs.com/webapp/wcs/stores/serv...e%2Bmatchallany Link to comment Share on other sites More sharing options...
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