The problem could be a leaking intake manifold or a head gasket, and the fouled plug might be localized to one or two adjacent cylinders. The burned coolant leaves deposits on the electrodes and insulator, creating hot spots that could cause pre-ignition and a misfire code being set.Click to see full answer. Accordingly, does antifreeze ruin spark plugs?That’s also bad news because over time coolant contamination can ruin the bearings. Coolant passing through the combustion chamber also can foul spark plugs, oxygen sensors and the catalytic converter.Also, what do spark plugs look like when you have a blown head gasket? Inspect each spark plug for failure signs. Dark sooting from misfiring, water droplets, brown spotting, and rust around the threads are all signs of head gasket failure. Inspect each of the spark plug boots. Similarly, what does it mean when there’s oil on the spark plugs? Oil is leaking into spark plug well Inspection Service. Oil leaking into the spark plug wells is an indictor of a fairly serious problem that should be inspected and repaired immediately. It is almost always due to a failing gasket or O-ring but can also be the result of a failing piston or worn valve guides.Can a blown head gasket foul spark plugs?A blown head gasket is simply a break in the gasket in between your cylinder block and cylinder head. As the coolant is vaporized in the combustion chamber, it can foul your spark plugs and cause misfires in the cylinder. That vaporized coolant will travel out of your exhaust system as thick, sweet, white smoke.
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