Quote:
Originally Posted by upstateX5M
eventually it will start throwing codes, but not until the very end. Its just a slow decrease in power until then.
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No. You don't just gradually lose power from failing plugs/coils. Don't mean to insult your intelligence or anything but that's not how spark plugs or ignition coils work. A failing spark plug, will intermittently not produce a spark which causes a 'hiccup' in the continuous ignition of the air/fuel in the combustion chamber. This hiccup is known as a misfire on the corresponding cylinder which WILL trigger a DTM, CEL, or both. Or your car will crank longer on startups or if it's more serious, not start at all. But your car will tell you if either are bad, whether it's coil or plugs, troubleshooting is a different process.