Ford Explorer Has Rough Idle

Troubleshooting Causes of Rough Idle in Your Ford Explorer 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 Ford Explorer 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 Ford Explorer 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.

Customers with drum brake systems often specify they have lost braking power, or that the vehicle's brakes are making noise. This is because brake drums do not dissipate heat very well, so the heat from hard braking will cause stress fractures. These fractures make can make noise on the brake shoes as the drum revolves around the shoes. Lastly, the brake shoes may not be problematic, but may cause a grinding noise while stopping. This would indicate the shoes have no braking material left, and the brake shoes must be changed before the vehicle can be safely driven.

Learn more about brake shoe symptoms

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.

Troubleshooting Rough Idle in a Ford Explorer

When faced with a rough idle in your Ford Explorer, it's essential to adopt a methodical diagnostic approach. Begin by inspecting for vacuum leaks, as these are often the most straightforward and common culprits. Carefully examine hoses and connections for any signs of wear or disconnection. Next, check the ignition system, particularly the ignition coils, as faulty coils can disrupt the spark needed for smooth engine operation. If the rough idle is more pronounced when the engine is cold, consider evaluating the cold start valve and temperature sensor, as these components play a crucial role in engine performance during startup. Additionally, inspect the fuel system for potential issues such as clogged filters or injectors, which can hinder fuel delivery. As you progress, monitor fuel trims to gain insights into the air-fuel mixture, and ensure that the throttle body is clean and the air filter is in good condition. If these initial checks do not resolve the issue, it may be time to replace the spark plugs, as worn plugs can significantly impact engine performance. By following this structured approach, you can effectively diagnose and address the rough idle in your Ford Explorer, ensuring a smoother driving experience.

What Are the Common Causes of Rough Idle in a Ford Explorer?

When dealing with a rough idle in your Ford Explorer, it's crucial to understand the common problems that may be affecting your vehicle's performance. One of the primary culprits is vacuum leaks, which can occur in the intake manifold or vacuum lines. These leaks disrupt the fuel-to-air ratio, causing the engine to run unevenly. Additionally, spark plug issues can significantly impact engine performance; worn or faulty spark plugs can lead to misfires, resulting in a rough idle. Another common issue is related to the ignition coil, which is responsible for delivering the spark needed for combustion. If the ignition coil is malfunctioning, it can cause erratic engine behavior, particularly at low speeds or when the vehicle is stationary. Addressing these issues promptly is essential for maintaining optimal engine performance and ensuring a smooth driving experience. By identifying and rectifying these common problems, DIY enthusiasts can enhance their Ford Explorer's reliability and efficiency.

Why is a Ford Explorer Idling Rough and What Should You Do?

When your Ford Explorer is idling rough, it’s crucial to understand that this symptom should not be ignored. Rough idling can indicate underlying problems such as vacuum leaks or engine misfires, which, if left unaddressed, may lead to more significant engine damage or even compromise your vehicle's safety. A vacuum leak disrupts the air-fuel mixture necessary for optimal engine performance, while misfiring can cause further strain on engine components. Regular maintenance, including timely replacement of filters and cleaning of critical components like the throttle body and idle air control valve, can prevent these issues from escalating. By taking immediate action to diagnose and resolve rough idling, you not only enhance your Ford Explorer's performance but also safeguard against costly repairs and ensure a safer driving experience.

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