Common questions

Will a spark plug wire shock you?

Will a spark plug wire shock you?

In theory, it should not shock you through the boot. However, it is possible for the spark to jump out around the boot and shock you that way. If the wires or boots are cracked or brittle, they should be replaced. If you’re having a problem with missing or inconsistent running, plug wires are often the problem.

Where does the charge from a spark plug come from?

High voltage, 5 kV to 45 kV, depending on the vehicle, is generated in an ignition coil, controlled by a distributor or engine control module (ECM). The charge is conducted to the spark plug via a spark plug wire. The spark occurs when the charge jumps between the spark plug electrodes, just 0.01” to 0.07” (0.25 mm to 1.8 mm) across.

What are the symptoms of a spark plug problem?

Hesitation / Surging – Slightly less noticeable, hesitation on acceleration and surging might be described as the engine not “responding” immediately to driver input. Then, a “surge” in power might come unexpectedly. This slight delay in power delivery might indicate a spark plug problem.

Can a bad spark plug cause a car to not start?

Each vehicle requires a particular type of spark plug made from specific materials and with a designated spark plug gap that is set by a mechanic during installation. Good spark plugs will burn fuel efficiently, while bad or failing spark plugs can cause the motor not to start at all.

Where do you change the spark plugs in a car?

For most vehicles, replacing spark plugs is a simple matter, though you might need to be a contortionist to get to some of them, perhaps placed behind shields or under intake manifolds and other equipment. Here are the basic steps to replace spark plugs.

How are spark plug wires connected in the correct order?

However, the points and steps are always the same. Connect the wires according to the firing order on the distributor. Since the first spark plug is already connected, turn the distribution rotor once. If it lands on terminal 3, connect the terminal with the third cylinder.

Can a bad spark plug cause a hard start?

Hard starts is one of the most common bad spark wire issues. Bad plugs can also drain the battery, stopping the engine from picking up. If you are certain it is not a battery issue, then you should replace the spark plug as soon as possible. Engine misfiring is one of the known symptoms of a bad spark plug wire in a car.

How does a spark plug start an engine?

Now when the engine needs a spark, the connection that started the current flow is opened. When this happens, the magnetic field begins to collapse. The collapsing field cuts across the windings of the coil and when a magnetic field moves around a conductor, current is induced to flow.

How are spark plugs supposed to work on a BMW?

When you slide a plug wire end like this over the bare threaded tip of the spark plug, you can feel that clip as it slides down over the ridges of the threads, leaving no doubt that you have it on. The original BMW 2002 plug wire ends are designed to accept the bare threaded post. Note the little clip on the hole. Rob Siegel

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Ruth Doyle