2023 Land Rover Discovery Has Rough Idle

Troubleshooting Causes of Rough Idle in Your 2023 Land Rover Discovery and How to Resolve Them

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Reviewed by
Andrew Hajjar
Written by RepairPal Car Genius
Updated January 14, 2025
0%
21% chance it's the
Spark Plugs
0%
15% chance it's the
Ignition Coil
0%
64% chance it's
Something else
The most common reasons a 2023 Land Rover Discovery has rough idle are a vacuum leak, an issue with the spark plugs, or a problem with the ignition coil.
  • Spark Plugs: Worn or fouled spark plugs can lead to misfires, poor fuel economy, and difficulty starting the engine.
  • Ignition Coil: A faulty ignition coil can cause misfires, rough idling, and difficulty starting the engine due to inadequate spark delivery to the spark plugs.
Proper diagnosis will determine the exact cause of your symptom, saving you money on unnecessary repairs. The diagnostic experts at RepairPal Certified shops have the right tools and experience to solve any symptom.

How much does it cost to fix a 2023 Land Rover Discovery has rough idle?

Common Repairs

The total repair cost will vary based on the condition of your vehicle and the number of repairs needed to fix your symptom. Proper diagnosis will save you money by finding the exact repairs needed to fix your car right the first time.

Brake caliper failure occurs in two different ways, and they create different symptoms.

The caliper can become stuck, in which case it won't release the brake pads. The seized caliper will cause the vehicle to brake constantly on one side, forcing the car to move toward that side. This pulling will be accompanied by a strong odor from one wheel.

Another way calipers fail is by leaking. If the caliper leaks, the brake pedal will feel too easy to push, and will sink all the way to the floor when held. Braking will become less effective the longer this goes on. There may also be brake fluid leaking onto the wheel.

Here are a few common symptoms of worn-out brake pads:

  1. Low brake pad warning light is on: Not all vehicles are equipped with this system, but if yours is, this dashboard indicator light will likely be the first signal it’s time to replace your brake pads.
  2. Brakes start to squeal regularly: This is often one of the first signs of worn brake pads and is caused by a metallic piece built into brake pads for this exact purpose. This part contacts the brake rotor to make a squealing or whining noise when the pads are low.
  3. Brakes make loud grinding noise: If not addressed early enough, your brake pads may get so worn that the metal backing plate of the pad grinds against the metal rotor.
  4. Brake pads look thin: You may be able to visually check your brake pad thickness to determine if they need replacement.

Brake rotors are mainly maintenance free, but when they have been subjected to abnormally hard use, the heat they absorb can cause the metal to turn blue, and cracking to occur. When this occurs, customers often specify they have lost braking power, or the vehicle's brakes are making noise. There may be no symptoms at all related to changing the brake rotors, since it is recommended to change brake rotors on most modern vehicles when performing a standard brake service.

Most often, a brake system inspection will just be a routine portion of manufacturer specified maintenance, and will be performed at mileage intervals. In those cases, there will likely be no symptoms. However, when a brake system makes a funny noise, causes vibration, is hard to use, will not slow the vehicle, prevents the vehicle from driving, makes the vehicle pull to one side, or leaks brake fluid, the vehicle will need a visit dedicated to the inspection of the brake system.

What are the initial diagnostic steps to take for a rough idle in a 2023 Land Rover Discovery?

When faced with a rough idle in your 2023 Land Rover Discovery, it's essential to adopt a systematic diagnostic approach to identify the root cause. Start by checking the spark plugs, as worn or faulty plugs can significantly impact engine performance. Next, inspect the air filter; a dirty or clogged filter can restrict airflow, leading to an uneven idle. Following this, examine the fuel system, including the fuel filter and injectors, to ensure that fuel delivery is optimal. Utilizing an OBD-II scanner to check for error codes can provide insights into any underlying issues related to the engine or emissions system. Additionally, inspect the throttle body for cleanliness and functionality, as a malfunction here can disrupt the air-fuel mixture. Finally, check for any vacuum leaks in hoses and connections, as these can also contribute to a rough idle. By methodically addressing these areas, you can effectively diagnose and potentially resolve the rough idle issue in your vehicle.

What are the common problems that could cause a rough idle in a 2023 Land Rover Discovery?

When dealing with a rough idle in your 2023 Land Rover Discovery, it's crucial to understand the common problems that may be at play. Start by checking the air filters; a dirty or clogged filter can significantly restrict airflow to the engine, leading to performance issues. Next, inspect the spark plugs, as worn or faulty plugs can cause misfiring, which directly affects engine smoothness. Additionally, look for vacuum leaks, as these can disrupt the air-fuel mixture, resulting in an unstable idle. Fuel system components, such as the fuel filter and fuel pump, should also be examined, as any clogs or malfunctions can hinder engine performance. Don't overlook the mass airflow sensor; if it's malfunctioning, it can throw off the air-fuel mixture, contributing to a rough idle. Lastly, consider the EGR valve, as issues here can impact combustion and lead to idling problems. By systematically checking these components, you can identify and address the root cause of the rough idle, ensuring your vehicle runs smoothly.

How urgent is it to address the rough idle in a 2023 Land Rover Discovery?

Addressing a rough idle in your 2023 Land Rover Discovery should be treated with a sense of urgency, as neglecting this symptom can lead to serious consequences. A rough idle often signals underlying issues within the engine, fuel system, or ignition system, which can progressively worsen if not addressed promptly. This not only affects your vehicle's performance but can also lead to decreased fuel efficiency and potential damage to critical engine components. Moreover, if the problem escalates, it could pose safety risks while driving. For DIY enthusiasts, it’s essential to regularly monitor your vehicle's performance and conduct basic diagnostics to identify the root cause of the rough idle. By taking proactive measures, you can prevent more costly repairs in the future and ensure that your Land Rover continues to operate smoothly and reliably. Remember, timely intervention is key to maintaining the longevity and safety of your vehicle.

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