Is there a risk of igniting the incoming charge with wasted spark systems?


What is wasted spark in relation to ignition system?

A wasted spark system is a type of ignition system used in some four-stroke cycle internal combustion engines. In a wasted spark system, the spark plugs fire in pairs, with one plug in a cylinder on its compression stroke and the other plug in a cylinder on its exhaust stroke.

Is wasted spark good?

Because waste sparks consume energy without producing anything useful, they reduce the engine’s efficiency and power output, while increasing fuel consumption (especially at low power settings). This decrease in fuel efficiency and power output is not acceptable unless the engine’s weight is extremely important.

How many cylinders does a wasted spark coil fire at a time?

Some engines have ignition systems with coil packs that fire two cylinders simultaneously, known as the waste spark method. One cylinder is on its compression stroke, and the other is on its exhaust stroke.

What is the advantage of a waste spark ignition system?

The advantage of such system is that no distributor is needed, so there is no mechanical parts, wear or voltage drops. As a result the coil need less energy so can be made smaller. Usually in a 4 cylinder engine we’ll have two coils in one body – coil pack.

How does a waste spark ignition system fire the spark plugs?

Unlike conventional ignition systems, waste spark DIS ignition systems use half the spark to fire the opposite spark plug unconventionally from the side electrode to the center electrode.

What is the difference between coil on plug and waste spark type ignition system?

The coil provides the spark for one of the paired cylinders on the compression stroke and to the other on the exhaust stroke. Because the coil fires the spark plug on the exhaust stroke as well, it is appropriately named ‘wasted spark ignition’. In effect, the spark plugs fire simultaneously and twice as often.

How long do ignition coils last?

around 100,000 miles

Average lifetime of ignition coil is around 100,000 miles or more. It is not an easy worn out replacement car part but still could fail for variety of reasons.

What makes the ignition coil fire?

So how does a coil actually fire a spark plug? When battery voltage from the ignition circuit, ignition module or PCM flows through the coil’s primary windings, the iron core becomes a strong electromagnet. The voltage then passes from the coil to the spark plug and creates a spark that ignites the air/fuel mixture.

What are the disadvantages of electronic ignition system?

The main disadvantage of electronic Ignition is that this system is very expensive because all cannot afford the vehicles having an electronic ignition system.

How much does it cost to replace ignition coils?

between $209 and $278

The average cost for ignition coil replacement is between $209 and $278. Labor costs are estimated between $51 and $64 while parts are priced between $158 and $214. This range does not include taxes and fees, and does not factor in your specific vehicle or unique location. Related repairs may also be needed.

How do you stop ignition coils from failing?

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

What would cause an ignition coil not to fire?

What Would Cause An Ignition Coil Not To Fire? There are a number of factors that may cause not a spark. This may include a faulty crank sensor and a faulty ignition module, or a bad wire in the primary circuit. Repair can only be repaired by hiring a quality technician to do a comprehensive assessment and estimation.

What are the symptoms of ignition coil failure?

What Are the Signs of a Faulty Ignition Coil?

  • Loss of Power. This is one of the first symptoms of ignition coil failure. …
  • Check Engine Light On. …
  • Poor Fuel Economy. …
  • Backfiring. …
  • Misfiring Engine. …
  • Hard Starts and Stalling. …
  • Spluttering and Coughing Sounds. …
  • Jerking and Vibrating.

What happens when ignition coil fails?

Ignition coil failure may also result in the stalling of the vehicle. This can occur because of the irregular sparks sent to the spark plugs by the faulty coil. Your car may shut off completely when brought to a stop leaving you with the trouble of it hopefully restarting.

How do you check a spark ignition coil?

How Test Ignition Coil Pack with a Multimeter

  1. Set up the vehicle. Make sure the vehicle has cooled down from any driving or idling, and then switch the emergency brake on. …
  2. Remove ignition coils. …
  3. Check primary winding. …
  4. Check secondary winding. …
  5. Resolve each issue. …
  6. Don’t forget to check the spark plugs.

Can you test ignition coils?

The only safe way to test for spark is to use a spark plug tester tool. If a coil problem is suspected, measure the coil’s primary and secondary resistance with an ohmmeter. If either is out of specifications, the coil needs to be replaced.