![]() ![]() This causes rough idling and might make the misfiring issue even worse. The O2 sensor will think your engine is running too rich which will cause your ECU to incorrectly regulate your fuel mixture, making it run too lean. Car Hesitates to StartĪs mentioned above, when the engine misfires, it sends unburned fuel into the exhaust system which sends mixed signals to the O2 sensor. Now that you know what to look for visually, here are some ways in which bad spark plugs will affect the drivability of your car. Wet electrode, covered in fuel: Signs of a flooded engine.īeing more aware of your car’s needs will make you proactive, and push you to carry the right tools and spares in the car at all times, should the need arise when you least expect it.Melting center electrode: Clear signs of detonation or pre-ignition. ![]() Molten electrode with white blistered insulator tip: You’re probably using the wrong heat range.These will form an unburnable ash that might spill into the combustion chamber. Brown cinder-like deposits: Alloying additives in the form of residue from fuel additives.Yellow or brownish-yellow deposits on the insulator: Contaminated deposits of carbon or lead from fuel or oil additives.This is likely a serious that you should not ignore. Oil is probably getting into the cylinders due to damaged pistons or piston rings. Black soot or carbon deposits: Indicates incorrect air-fuel ratio, the spark plugs are probably colder than the application requires, or you have a clogged air filter.Clean greyish electrode, yellow to brown: Normal.Here’s a quick visual inspection list for your reference: The hard part is knowing what to look for. Spotting bad-looking spark plugs is easy all you need to do is unscrew them one by one and inspect them. Doing this every 10,000 or 15,000 miles will go a long way. If you suspect that something is up with your spark plugs, the best thing you can do is inspect them visually. Sure, you can always go to the mechanic, but being able to tell when something is up with your car will go a long way. Most problems in your car can be diagnosed simply by keeping your eyes, ears, and nose open. ![]()
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