2005 Ford Explorer Sport Trac Has Rough Idle

Troubleshooting Causes of Rough Idle in Your 2005 Ford Explorer Sport Trac and How to Resolve Them

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Reviewed by
Devin Cabugcal
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 2005 Ford Explorer Sport Trac 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 2005 Ford Explorer Sport Trac 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 2005 Ford Explorer Sport Trac?

When faced with a rough idle in your 2005 Ford Explorer Sport Trac, it's essential to adopt a systematic diagnostic approach that begins with the most straightforward checks. Start by inspecting for vacuum leaks, as damaged hoses or connections can significantly impact engine performance. Next, examine the air filter; a clogged filter restricts airflow, which can lead to an uneven idle. Don't overlook the spark plugs, as worn or fouled plugs can cause misfires, contributing to the rough idle. Utilizing an OBD-II scanner to check for error codes can provide insights into specific issues, such as faulty sensors. Additionally, assess the fuel system components, including the injectors and fuel pump, to ensure proper fuel delivery. Finally, consider the idle air control valve, as cleaning or replacing a malfunctioning IAC can often resolve idle issues. By following this structured approach, you can effectively diagnose and address the rough idle in your vehicle, ensuring a smoother driving experience.

What are the common causes of a rough idle in a 2005 Ford Explorer Sport Trac?

When dealing with a rough idle in a 2005 Ford Explorer Sport Trac, it's essential to consider several common problems that could be at play. One of the primary culprits is a vacuum leak, which can disrupt the air-fuel mixture necessary for smooth engine operation. To identify a vacuum leak, inspect hoses and connections for any signs of wear or damage, and consider using smoke testing to pinpoint elusive leaks. Another frequent issue is engine misfiring, which can stem from faulty spark plugs, ignition coils, or fuel injectors. Ensuring these components are in good condition can significantly improve idle quality. Additionally, engine stalling and loss of power may indicate deeper issues, such as fuel delivery problems or sensor malfunctions. By systematically checking these areas, you can effectively diagnose and address the rough idle, restoring your Explorer Sport Trac's performance.

How urgent is it to address the rough idle in a 2005 Ford Explorer Sport Trac?

Addressing a rough idle in your 2005 Ford Explorer Sport Trac is not just a matter of comfort; it is crucial for the overall health of your vehicle. A rough idle can indicate underlying problems such as fuel delivery issues, ignition system failures, or even vacuum leaks, which, if ignored, may escalate into more severe engine damage. This neglect can lead to decreased fuel efficiency, increased emissions, and ultimately, costly repairs. Moreover, a rough idle can compromise your vehicle's performance, making it less reliable and potentially unsafe to drive. By addressing this issue promptly, you not only enhance your vehicle's efficiency but also mitigate the risk of safety hazards that could arise from driving a malfunctioning vehicle. Therefore, it is essential to take immediate action to diagnose and resolve the rough idle, ensuring your Ford Explorer Sport Trac operates smoothly and efficiently for years to come.

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