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BMW 528i Ignition Coil

Symptoms of a Faulty BMW 528i Ignition Coil

Your BMW 528i ignition coil is responsible for one thing-delivering a spark of several thousand volts to the spark plug. Without it, you will have a hard time starting the engine or even keeping it running. When you start experiencing these complications, immediately get your ignition coil looked at.

Poor fuel economy

Because a failing ignition coil is no longer able to provide a high-voltage spark, engine cylinders will miss intermediately or completely. This results into less power and RPM that is normally seen with maximum cylinder combustion. With the engine power reduced, your car will be travelling fewer miles per gallon. This symptom is also accompanied by a noticeable lack of power through all driving ranges.

Bad exhaust

As a result of less-efficient fuel use, the exhaust's performance will also be affected. You will notice this when you see black fumes that smell of gasoline come out of the system. Before you get caught for "polluting the air," immediately take your car to a mechanic.

Engine backfire

If your car is backfiring, this can also indicate that your ignition coil is failing. Engine backfire occurs when unused fuel is emitted through the exhaust system. Not addressing this issue will cause serious damage to the exhaust and will result in costly repairs. If the poor mileage and black exhaust fumes isn't enough to convince you, then a small explosion should.

Difficult to start

Because a bad ignition coil means that the spark plug is no longer receiving the needed amount of charge, you should have a harder time starting up your car. This is especially noticeable when the vehicle is cold or when the weather is very humid.

Engine misfire

Aside from your engine backfiring, it can also misfire. When you try to start your car and the ignition coil fails, your vehicle will cough and splutter regularly. When you drive faster, it will suddenly jerk and spit. Your car will also tend to vibrate when the engine is idling.


A faulty ignition coil can result to your car in a stalling condition when the engine is on idle or low-speed operation. If the component cannot recharge fast enough to deliver the needed voltage to the spark plug, the engine can cut out when you push the accelerator pedal.

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  • Preventive Maintenance Tips for Your BMW 528i Ignition Coil

    Every time you start the engine, your BMW 528i ignition coil powers the spark plug and keeps it powered. Without this component, you will have a hard time starting your car and keeping the engine running. The good news here is that keeping the ignition coil efficient is fairly easy-all you have to do is regularly inspect it. If you don't know where to start, follow these tips:

    Safety precaution reminders

    Disconnect the battery ground before tinkering with the ignition coil.

    Switch off the ignition before connecting or disconnecting the battery, or else the engine control unit might be damaged.

    Do not touch or disconnect the ignition coil while the engine is running or starting.

    Always switch off the ignition before connecting or disconnecting the ignition coil.

    If you have to run the engine at starting speed without actually starting it, unplug the connectors from the ignition coil's output stage and from all the injectors.

    Inspecting the ignition coil

    Make sure that you parked your car in a safe place, preferably your garage.

    Before locating the ignition coil, disconnect the negative cable (the black one) from the battery.

    To find the ignition coil, follow the spark plug wires to the distributor, then follow the wire coming out of the center of the distributor cap, which connects the coil. Once located, unplug the wire that came from the distributor.

    If you have easy access to the ignition coil for testing, you can leave it mounted in place and just disconnect the other electrical connector and wires. Otherwise, remove the component using a wrench or ratchet and socket of the right size.

    Make sure that all the ignition coil's electrical contacts are free of dirt and corrosion. If you spot any dirt, clean them with a dry cloth.

    Use an ohmmeter to measure the component's primary and secondary resistance.

    Cleaning tips

    Do not spray anything on the ignition coil. Just wipe the component with a clean, dry rag then put it back.

    If you see that the ignition coil is dirty on the inside, apply a few drops of fine abrasive on a Q-tip before swabbing the component to polish it. You can also wrap a tiny piece of 600-grit Emery cloth around the Q-tip before polishing the component.