Bad Ignition Coil Symptoms: 7 Common Signs

Bad Ignition Coil Symptoms: 7 Common Signs. In this video I will explain the most common symptoms of bad ignition coils. Having ignition coil problems in your vehicle? This video covers the major signs of a failing ignition coil. Learn the common symptoms like engine misfires, rough idle, lack of power, poor performance, increased emissions and gas smells from the exhaust. Ignition coils provide the high voltage spark to ignite the compressed air/fuel mixture in your engine. When they go bad, the sparks become inconsistent or stop altogether leading to misfires.
We discuss trouble codes that can indicate ignition issues like P0300, P0301, P0302, P0303, P0304, P0305, P0306. Engine warning lights may illuminate if the vehicle's computer detects something is wrong. Hard starting the car is also very common when you have failing or bad ignition coils. Replace them promptly to restore engine performance and prevent further damage to catalytic converters.

[@stellamatutina3573]

I have a Nissan Nerva Ka24de 2000 petrel RWD with the coil inside the distributor cap, I had a small misfire when the car warmed up and when i pulled the number one cylinder sparkplug out, the plug had a wet residue build-up on the sparkplug thread, when I cleaned the corrosion from the pins under the cup and the green corrosion on the coil, The misfire went away and no more residue after a cupel week of driving on the number one plug thread, which means the cylinder combustion is firing correctly again, but this problem keeps on coming back every cupel of months.. I have new Leeds, new sparkplugs and a new cap and new PVC valve.. Could It be a faulty coil be causing this residue build up on the sparkplug thread..? Ps, The valve cover gasket is good no leaks, compression rings is good and valve seals are good, no burring oil or smoke out of the exhaust..

[@redinstrumental7535]

What if I pulled out the number 4 coil and it has green slime at the bottom of it

[@leeh6816]

At point 7 you say that if it fails completely it will stop sparking the plugs in that particular cylinder. But if it completely fails would the engine be able to start at all/wouldn’t all spark plugs stop sparking? Asking as i have a 5.0 v8 mercruiser that can be difficult to start and on changing plugs noticed two of the 8 were blacker than the others and i definitely get a smell of gas when moving

[@HonestMechanicChannel]

When a spark plug fails in an engine, it typically only affects the cylinder it's in. In your V8 engine, if two spark plugs are fouled and blackened, it's likely that those two cylinders are misfiring. This means that those specific cylinders are not burning the fuel properly, which leads to the unburned fuel smell you're noticing.
An engine can still start and run with one or more bad spark plugs, but it will run poorly and be less efficient. If the problem is severe, starting can become difficult, and the engine will exhibit symptoms such as rough idling, reduced power, and increased fuel consumption.
Given your description of the symptoms and the observation of the spark plugs, it's a good idea to replace the fouled plugs and check for any underlying issues, such as a rich fuel mixture or ignition problems, that might have caused the plugs to foul in the first place.

[@leeh6816]

@@HonestMechanicChannelthats great, thank you. Ive got new plugs, leads, distributor cap and coil to fit. Thanks again 👍

[@2kostasd]

Love your videos - short, and to the point!! Thanks!!!

[@HonestMechanicChannel]

Glad you like them! Thanks for watching!

[@prophetisraelking3759]

Thanks

[@HonestMechanicChannel]

Thanks for watching!

[@user-id6uo2zd4x]

Thanks .

[@HonestMechanicChannel]

You're welcome!

[@tigerax8384]

Tqvm

[@HonestMechanicChannel]

You're welcome!