How to Diagnose Ignition Coil Problems on a McLaren 570S and 720S

When a twin-turbocharged V8 engine shows its potential, most of the engines prefer silence over competition. McLaren isn’t ordinary; models like the McLaren 570S and 720S are the gems of all cars. The component that powers this more is the ignition coil, which gives the electrical spark that is required for efficient combustion.

But when the ignition coil breaks down, you will face a lot of problems because it is an important part of the car; it will also cause problems to your car, such as engine misfires, loss of power, rough idling, poor acceleration, and lower fuel economy. And you simply cannot afford to neglect even one of these problems because it may turn into something major in the future. 

Let’s now get into the actual reason why and how this problem may occur, and how you can diagnose ignition coil problems on a McLaren 570S and 720S, and what would happen if you neglect it.

What Does This Do?

It converts your car's low voltage into a super high-voltage electrical charge. It works mostly in a way to light the air-fuel mixture inside every single cylinder.

Recent parts are made very smartly; it uses a coil-on-plug ignition system that implies every cylinder has its own ignition coil, connected directly to the spark plug. This arrangement gives: 

• More precise ignition timing
• Improved fuel efficiency
• Better throttle response
• Reduced emissions
• Increased engine performance

Why McLaren Model Ignition Coils Fail

McLaren ignition units are built to last, but there are several reasons why they may fail early. 

Heat Exposure

There is some serious heat in the engine bay of a McLaren. If subjected to prolonged high temperatures, the coil components and insulation can break down over time.

Age and Mileage

They, like all electrical components, have a limited life span. Multiple cooling and heating cycles gradually deteriorate the performance. 

Spark Plug Wear

Worn spark plugs force ignition coils to work harder to create sufficient spark energy, increasing stress on the coils.

Moisture Contamination

Water ingress or condensation on or around the ignition components can damage electrical connections and lead to failure earlier. 

Power Surges

The operation of the electrical system of the vehicle can cause irregular voltage, which can have a negative effect on the performance of the ignition coil.

Identification Symptoms of an Ignition Coil Crack

Catching warning signs early can save you from more serious engine problems and associated repair costs.

1. Engine Misfires

Engine misfires are one of the first signs that your ignition coil is failing.

Possible symptoms include:

• Hesitation during acceleration
• Intermittent power loss
• Engine stumbling under load
• Uneven engine operation

It might spark when the spark plug isn’t powering the air-fuel mixture.

2. Check Engine Light

Modern McLarens continuously monitor ignition performance. These models have smart indicating signals that will give you an idea that something is wrong, it finds out the misfire or ignition faults, and the sensor light will indicate the problem.

Common fault codes include:

• P0300 (Random Misfire)
• P0301-P0308 (Cylinder-Specific Misfire Codes)
• These codes often point technicians toward the affected cylinder.

3. Rough Idle

A healthy McLaren engine should idle smoothly.

Failing ignition coils may cause:

• Vibrations at idle
• Uneven engine speed
• Noticeable shaking
• Rough running after startup

4. Reduced Engine Performance

McLaren engines are dependent on accurate combustion, so even one bad coil is going to have a big impact on performance.”

Drivers may see: 

• Reduced acceleration
• Slower throttle response
• Decreased power output
• Turbo lag-like symptoms

5. More Fuel Consumption

Inefficient combustion burns more fuel.
A sudden loss of fuel economy might sometimes indicate problems having to do with ignition. 

6. Difficult Starting

In extreme cases, a bad ignition coil can cause hard starting of the engine.

The symptoms are: 

• Extended cranking
• Multiple start attempts
• Intermittent starting issues

7. Exhaust Popping or Backfiring

Non-burned fuel going into the exhaust system may cause popping or backfiring, particularly when there is acceleration or deceleration.

McLaren 570S Ignition Coil Issues

Commonly reported owners' problems with the ignition coil are:

• Intermittent misfires under boost
• Rough cold starts
• Check engine warnings
• Hesitation during hard acceleration

This can be clearer over high-spirited driving or track use, as performance driving puts more strain on the ignition system.

McLaren 720S Ignition Coil Troubles

You can trust its ignition coils, but mileage might lead this to wear out.
Some complaints are:

• Misfires at high RPM
• Loss of power under acceleration
• Engine warning lights
• Rough idle conditions
  

Diagnosing the Problems

You need to know from basic to extreme, as ignition coils might lead to issues involving spark plugs, fuel injectors, or sensors.

Step 1: Scan for Fault Codes

Begin by connecting a diagnostic scanner.

Find:

• Misfire codes
• Ignition circuit faults
• Cylinder-specific errors

All this data will help you identify the affected cylinder immediately.

Step 2: Investigate the Ignition Coils

When you see the issue, you may find:

• Cracked coil housings
• Burn marks
• Corrosion
• Oil contamination
• Damaged connectors

Any damage you are seeing can be a strong indicator of failure.

Step 3: Check the Spark Plugs

Before replacing coils, it’s good to see this first

Find:

• Excessive wear
• Carbon deposits
• Oil fouling
• Incorrect spark plug gap

Step 4: Swap-Test the Coil

A common workshop diagnosis is to replace the suspected coil with another cylinder.

If the misfire code follows the coil to the new cylinder, the coil is probably bad. 

Step 5: Monitor Live Data

The good checking equipment will help technicians to observe:

• Misfire counts
• Ignition timing
• Cylinder performance
• Fuel trim data

Confirm the root cause; if you win, you don’t have to replace any component

Can You Drive with a Faulty Ignition Coil?

It's a yes—but not recommended.

Driving with a failing ignition coil can result in:

• Reduced performance
• More fuel consumption
• Catalyst damage
• Excessive engine stress
• Additional repair costs

Should You Replace One Coil or All Coils?

Again, a common question asked by the owners.

Replacing a Single Coil

Appropriate when:

• Only one coil has failed
• Remaining coils are relatively new
• Vehicle mileage is low

Replacing Multiple Coils

Recommended when:

• Vehicle has higher mileage
• Multiple coils show signs of wear
• Preventative maintenance is preferred

Many performance specialists recommend replacing coils in sets when the vehicle reaches higher mileage intervals.

Why Use Quality Replacement Parts

This is not a normal car; the engine is made to operate in super-powered performing conditions, and quality matters the most.

Low-quality ignition coils can lead to:

• Repeat failures
• Misfire issues
• Reduced reliability
• Poor engine performance

In such conditions, if you have to replace any parts, owners prefer McLaren genuine parts. Luxury cars don’t run on fake parts. You have to make the right decisions for your own car, and if you win and use good quality parts, then you increase the life of your car. 

How to Avoid Future Ignition Coil Issues

The wear of the ignition coil cannot be avoided completely, but with proper maintenance, the service life can be extended.

Replace Spark Plugs on Schedule

Fresh spark plugs reduce stress on ignition coils.

Address Misfires Immediately

Prompt diagnosis prevents additional strain on the ignition system.

Do Not Overheat

The cooling system in good working order helps to lower temperatures in the engine bay.

Follow Recommended Service Intervals 

Routine inspections often catch ignition problems before they become serious.

Use Quality Components

Authentic McLaren OEM parts can help ensure compatibility and durability under demanding operating conditions. 

FAQs ( Frequently Asked Questions )

To what extent do McLaren ignition coils go?

At its extreme, it will last between 60,000 and 100,000 kilometres. Every driver is different, so it depends on how you maintain it as well.

Can bad spark plugs ruin ignition coils?

Yes. Every damaged thing is dangerous, even the spark plugs, as it adds more electrical problems, and then the ignition coils have to pay the price of working harder.

Can a bad ignition coil turn on the check engine light?

Usually yes. Misfires from ignition can be detected quickly by modern engine management systems.

Can ignition coil problems affect performance?

Certainly, any part that is not working or is almost there impacts the performance of a car.

How much does it cost to replace ignition coils?

The exact price is not easy to guess, but the technician's fee, or how badly it is damaged, also makes the price higher. Get it checked in time, and you might have to pay the nominal amount. 

Conclusion

This under hyped part is surely not heard by many, but deserves the importance of keeping a check. It can impact both car models. You can see it in its first stage only if the engine misfires, rough idling, loss of power, low fuel mileage, and if the engine sensor light comes on.

If you succeed in catching the right issue on time, then you will win, and your engine is saved from major problems. Keeping it checked at the given time helps in replacing the damaged part on time and keeps your car alive for a longer time.

Exotic Auto Parts offers the best McLaren replacement parts such as ignition coils, spark plugs, and electrical parts for the McLaren 570S, 720S, GT, Artura, and more. Discover our wide range of parts to help keep your McLaren performing at its best.