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Readers ask: 2003 cadillac deville ignition coil problems?

What are the symptoms of a bad ignition coil?

Ignition Coil Problems, Symptoms and Solutions

  • Engine misfires.
  • Rough idle.
  • A decrease in car power, especially in acceleration.
  • Poor fuel economy.
  • Difficulty starting the engine.
  • Check engine light is on.
  • Exhaust backfiring.
  • Increased hydrocarbon emissions.

Can you drive with a faulty ignition coil?

It is possible to drive with a faulty Coil On Plug (COP), but not advisable. Driving with a faulty waste spark ignition system won’t be possible. Driving with a faulty coil pack can damage other components of the engine. You‘ll also learn how to diagnose and replace your faulty coil.

How do you test a Northstar coil pack?

How to Test the Cadillac Northstar Coil Pack

  1. Raise the hood of the Cadillac you are diagnosing.
  2. Remove the two sparkplugs off of the first coil pack; remove from left to right.
  3. Ask an assistant or second person to turn the ignition key to the start position; crank the engine for no longer than three-second intervals.
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How often should ignition coils be replaced?

The ignition coil on car is supposed to last around 100,000 miles or more. You will have reduced gas mileage when coil begins to go bad and becomes less able to transfer power.

What does a bad ignition coil sound like?

Engine misfiring will be seen in a vehicle whose ignition coils have failed. Trying to start the engine of such a vehicle will result in engine misfiring that sounds like a coughing, sputtering noise. When driving at high speeds, jerking and spitting will be seen in the behavior of the vehicle.

How do you stop ignition coils from failing?

Keeping your spark plugs in optimum condition can reduce your chances of experiencing an ignition coil failure. As spark plugs wear down, the gap in which each spark plug is fired is widened, meaning the coil needs to provide a higher voltage in order to bridge the gap.

How long do ignition coil packs last?

The ignition coil on your car is supposed to last around 100,000 miles or more. There are a number of factors that can lead to this part become damaged prematurely. Most of the newer cars on the market have a hard plastic cover that is designed to protect the coil from damage.

What happens if ignition coil fails?

Engine misfires, rough idle, and loss of power



One of the most common symptoms associated with a faulty ignition coil is engine performance issues. Faulty coils may cause the vehicle to experience misfires, a rough idle, a loss in power and acceleration, and a reduction in gas mileage.

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How long can you drive a car with a bad coil pack?

The better answer would be to the question: “How long should I drive my car with one bad coil pack?” The answer to that is about a week or less.

Will a bad coil pack throw a code?

Check engine light comes on: The car’s computer oversees coil pack operation. If it detects a problem with an ignition coil, it will turn on the check engine light and log any related trouble codes. 2. Your engine runs poorly or stalls: A coil pack that’s not firing properly will result in incomplete engine combustion.

How do I know if my ignition control module is bad?

How to Tell if You Have a Bad Ignition Control Module

  1. Check engine light is on: The ECM monitors all parts of the vehicle that could affect emissions.
  2. Engine is misfiring or running rough: An engine misfire results from incomplete combustion.
  3. Stalling: A failing ignition module can occasionally prevent the engine from getting spark, causing it to stall.

Is it OK to replace just one ignition coil?

Changing Just One Coil



You can of course change just one coil. If your coils are easy to access, replacing them as they fail is OK, apart from the inconvenience. It is possible to drive a car with a faulty coil but it isn’t advised. But on larger engines, you may need to remove engine components like intake plenum.

Can a bad ignition coil cause transmission problems?

When the engine is misfiring, due to among other things a malfunctioning ignition coil, the manifold vacuum is reduced, giving false load info to the transmission vacuum modulator, which can cause the shifting to be late and harsh. this is the extent that it will affect the transmission.

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Should you replace all ignition coils at once?

A faulty ignition coil cannot be repaired; it must be replaced. In cases like this, to prevent future problems, your mechanic may recommend replacing all three rear ignition coils. Whenever one of the ignition coils goes bad, it’s also recommended replacing all spark plugs if they haven’t been replaced in a while.

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