![]() Keeping all these components in good running condition is also a big help towards keeping your coils in a good working condition. The increased voltage demands more current flow through the primary circuit and this increased current flow can overload the primary transistor. If the gap in your spark plug widens due to normal erosion, it leads to an increased voltage being required to create a spark in the chamber. Some simple regular maintenance will save you a lot of money in the long run. The discoloration will be evenly distributed and not spotty. A dark gray or black spark plug that is dry or charred is carbon-fouled. Youll need to look into engine overheating or other spark plug problems for that. Keeping your spark plugs in optimum condition can reduce your chances of experiencing an ignition coil failure. This is not fouling, because it isnt caused by coating, but it does mean you have a bad spark plug. If your spark plugs are worn out, it forces the ignition coils to operate at a much higher output. When you bring your vehicle to a stop, it may just shut off totally, thus leaving you needing to restart it. With ignition coil failure, your vehicle will have irregular sparks emitting to the plugs to keep it running. In worst case scenario, if the spark plugs are in really bad condition, the engine will not start. It will also vibrate when you are running idle at a stop sign or intersection. The most common signs of bad spark plugs in Lexus LS are poor acceleration or hesitation, rough idle, engine misfires, poor fuel economy, check engine light illuminates, engine knocking noise, and sometimes hard starting. When you drive at high speeds, your vehicle will jerk and spit. Throughout my motorcycle riding years, I’ve replaced hundreds of spark plugs mostly. You can also look for physical signs on the spark plugs themselves which may include burn marks, broken tips, rust, and corrosion. Your vehicle will cough and splutter regularly. The signs of bad motorcycle spark plugs include your motorcycle misfiring, backfiring, or frequently having a flooded engine. Trying to start your vehicle when the ignition coils fail will result in a rough ride. When the spark plug tries to ignite the air and fuel mixture, the combustion can be. Too little fuel in the cylinder and an excess amount of air can be the culprit to your backfiring problem. A lean condition in your engine is terrible for the engine internals. When less power is reaching the spark plugs, your vehicle will struggle and use more fuel to compensate for the lack of power transfer. Getting too much air and not enough fuel in your cylinder is called running lean. If your vehicle is getting a lot less mileage for the gallon, it could also be a sign of an ignition coil failure. You can run a simple test on the HT leads to check that there is in fact a spark going from each lead to each spark plug. If you have trouble starting your vehicle in the cold, this is a good sign of potential ignition coil failure. Ignition coil failures result in 1 or more spark plugs not receiving the appropriate amount of charge. They run between the distributor and spark plugs. You will need to check between the primary terminals with the meter leads.Check your high tension leads (HT Leads). With the meter, you can check for an internal open in the primary windings or excessive resistance. The proper method to check an ignition coil is using an oscilloscope, but an ohm meter works well, too. The issue here is a coil that has worn out from the constant charging and discharging cycles. The engine idles fine but breaks up under load. When the insulation fails due to heat, it's because the molecules have moved farther apart, making an alternative path for the electricity to take if that path is easier than jumping the gap of the spark plug. However, the engine runs smoothly in cooler temperatures or under less workload. ![]() The wire insulation then breaks down, and the engine bucks or misfires. In this case, the engine runs fine until engine temperatures rise and there is an increase in workload. This situation causes misfire (no defined operating state) and hard starting. ![]() Flywheel When your starter motor is turning over it is spinning your flywheel to create voltage for your ignition system and battery charging system. Audi A6 (YauhenD / Shutterstock) The most common signs of bad spark plugs in Audi A6 are poor acceleration or hesitation, rough idle, engine misfires, poor fuel economy, check engine light illuminates, engine knocking noise, and sometimes hard starting. The engine may run fine at idle and light load. If you're turning your key and the starter motor isn't cranking then you may have a faulty solenoid. This causes misfiring or bucking under load. ![]()
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