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Mazda Mpv Ignition Coil

Various Signs of a Failing Mazda MPV Ignition Coil

Right at the heart of the engine lies one of the most crucial components, the ignition coil. The ignition coil is very important because without it, the engine cannot produce the energy needed to instigate the firing of the spark plugs. Unfortunately, this part fails from time to time and when it does, the signs are telling. However, ignoring these signs will result to a range of problems in the vehicle not exclusive to the ignition system only.

Lower fuel economy

Probably the most pressing symptoms that a failed ignition coil could communicate is a decline in your fuel economy and gas mileage. This happens because the defective ignition coil is not able to give enough power to the spark plugs to burn off the fuel anymore. This phenomenon results to less power and more stepping on the gas pedal. Consequently, the engine becomes unable to provide the power you need and the fuel economy and gas mileage inevitably suffers.

Inefficient exhaust

You may notice that there will be a connection with all the symptoms mentioned here. For example, since the mixture of the air/fuel ratio is rich (more fuel content mixed), there will be an increase of byproducts that will travel from the combustion chamber to the exhaust. In turn, the exhaust may not be able to handle and process all the chemicals passing through. Unprocessed chemicals are extremely harmful to you and the environment.


Perhaps the earliest symptom of a failing ignition coil you can notice is backfiring. This happens when unused fuel is emitted through the car's exhaust. Since the unused fuel has enough juice to still combust given the right conditions, it creates a small explosion. Backfires can occur either in the car's manifold or in the exhaust pipe. More times than not, backfiring usually takes place in the latter. These backfires must be corrected immediately before it causes serious damage to your exhaust system.

Hard starting

Because the ignition coil cannot give the means for the spark plug to ignite the combustion, cars that are suffering from this problem have a harder time to start. This will further be highlighted when the car is cold or when the humidity level is high. In extreme cases, a car whose ignition coil has already failed completely will not start at all. Even jump-starting will be futile.


When your car starts to run rough, stuttering, hesitating, jerking, and stalling, that's your spark plug misfiring. One of the reasons of spark plug misfire is a broken ignition coil. Furthermore, there's an increase in engine vibration while the car is idling, like it's ready to die any second.

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  • Keeping the Spark of Mazda MPV Ignition Coils Going

    Just as the human body needs a healthy dose of nutrition to keep us lively throughout the day, the engine also needs constant supply of power to the spark plugs in order for the car to take you places. That energy supply comes from the ignition coil. However, after years of use, the ignition coil begins to tire and wear down, making the flow precious electricity needed by the spark plugs intermittent. If your car stutters frequently, is hard to start, and has been exhibiting low responsiveness, the coil might have gone bad. You can follow these quick and easy maintenance procedures to know if the ignition coil is responsible for making your car lifeless.

    Mechanical diagnosis

    The most common and effective way to diagnose a failing ignition coil is to check the wires that connects the power source to the spark plugs. After the wires are tested and the wires don't fire up, this indicates that there was no power transference from the battery to the ignition coil. To do this, check the coils individually for bright blue sparks while the car is in the on position. The one that doesn't have a spark is the faulty ignition coil. Be particularly careful with this because more than 20,000 volts can flow through the ignition coil on any given time. Wear protective gear made with rubber insulation.

    Using a multimeter

    Multimeters are great tools that can be used on virtually any part that has contact with electricity. In this case, the multimeter is going to read the ignition coil's contacts. What we're looking for here is resistance; so set the multimeter in ohms and connect the leads onto the connectors respectively. The reading should be in the middle of 0.7 to 1.7 ohms. For the secondary resistance, the reading should be 8,000 to 11,500 ohms.

    Cleaning the surroundings

    Rust, moisture, corrosion and, engine grime are not good things to be found near the ignition coil. Despite being shielded by an inner plastic covering against electromagnetic interference, the ignition coil corrodes easily and it swells up causing the outer covering to crack. Use a compressed air blower to knock away any moving bits and pieces off the surrounding area then wipe them up with dry cloth. Remember to disconnect the battery terminal to ensure safety against electrocution.