2006 Ford Expedition Has Rough Idle

Troubleshooting Causes of Rough Idle in Your 2006 Ford Expedition and How to Resolve Them

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Reviewed by
Bo Fader
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 2006 Ford Expedition 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 2006 Ford Expedition 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.

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.

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 2006 Ford Expedition?

When faced with a rough idle in your 2006 Ford Expedition, it's essential to approach the diagnosis methodically. Start by checking the spark plugs, as worn or fouled plugs can significantly impact engine performance. Next, inspect the air filter; a clogged filter can restrict airflow, leading to an uneven idle. Following this, examine the fuel system, including the fuel filter and injectors, to ensure there are no blockages affecting fuel delivery. Utilizing an OBD-II scanner to check for error codes can provide valuable insights into any underlying issues. Additionally, assess the Idle Air Control Valve (IAC), as a malfunction here can disrupt idle speed. Finally, don't overlook the throttle body; a buildup of dirt can alter the air-fuel mixture, contributing to rough idling. By systematically addressing these areas, you can effectively identify and resolve the cause of the rough idle in your vehicle.

What are the common causes of a rough idle in a 2006 Ford Expedition?

When dealing with a rough idle in a 2006 Ford Expedition, it's crucial to understand the common problems that could be causing this issue. One frequent culprit is a sticking EGR sensor, which can disrupt the engine's airflow and lead to an uneven idle. Additionally, mechanical issues such as worn spark plugs, faulty ignition coils, or vacuum leaks can significantly impact engine performance. It's also important to consider the role of the Idle Air Control (IAC) solenoid, as a malfunction here can prevent the engine from maintaining a steady idle. Changes in airflow, whether due to a clogged air filter or a failing mass airflow sensor (MAF), can further exacerbate rough idling symptoms. To effectively address these issues, a thorough diagnostic approach is recommended, allowing DIYers to pinpoint the exact cause and implement the necessary repairs.

How urgent is it to address the rough idle in a 2006 Ford Expedition?

Addressing a rough idle in your 2006 Ford Expedition is not just a matter of comfort; it is crucial for the vehicle's overall health and performance. Ignoring this symptom can lead to a cascade of problems, including decreased fuel efficiency and engine misfires, which can ultimately result in costly repairs. A rough idle often indicates underlying issues such as faulty spark plugs, fuel system malfunctions, or air intake problems that, if left unchecked, may escalate into more serious engine damage. Moreover, the longer you wait to address these symptoms, the more likely you are to experience a decline in your vehicle's reliability and safety. Regular maintenance and prompt attention to issues like a rough idle can significantly enhance the longevity of your Expedition, ensuring it runs smoothly and efficiently for years to come. Therefore, if you notice your vehicle idling roughly, it is imperative to investigate and resolve the issue as soon as possible to avoid further complications.

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