Why Your Spark Plugs Are Lying To You And How To Read Them Correctly

Your spark plugs are telling you exactly what is wrong with your engine. But most people never learn to read them. In this video I walk you through the exact color coding system mechanics use to diagnose engine problems without expensive computer scans. Learn what each spark plug color means, why the gap matters more than most people think, and the torque mistake that cracks cylinder heads. I tested multiple torque levels, heat ranges, and cleaning methods. The data shows clear patterns. A plug that is too cold fouls fast. A plug that is too hot destroys pistons. And overtightening compresses the crush washer unevenly, creating micro gaps where exhaust gases leak straight to your sensor element. Most check engine lights related to misfires between 80,000 and 120,000 miles are caused by plugs that are simply past their service life. The electrode wears down. The gap widens. The coil works harder. Eventually the coil fails. Here is what you will learn in this video: How to read spark plug color and what each color means. Why copper plugs last 30,000 miles while iridium plugs last 80,000 to 100,000 miles. The exact torque specification for your cylinder head type. Why anti-seize compounds can backfire if you use the wrong type. The heat range mistake that damages engines. How to inspect plugs for cracks before reinstalling them. The break-in procedure after replacement that most people skip. Why you should clean your MAF sensor if your plugs show excessive fouling. Your spark plugs are a free diagnostic tool every time you pull them. Learn to read them and you eliminate years of expensive guesswork. #SparkPlugs #CarRepair #DIYAutomotive