2018 Ford Police Interceptor Sedan Has Rough Idle

Address Rough Idle in 2018 Ford Police Interceptor Sedan for a Smoother Ride

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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 2018 Ford Police Interceptor Sedan 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 2018 Ford Police Interceptor Sedan 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 potential causes and diagnostic steps for a rough idle in a 2018 Ford Police Interceptor Sedan?

When dealing with a rough idle in your 2018 Ford Police Interceptor Sedan, it's essential to adopt a systematic diagnostic approach that begins with the simplest potential causes. Start by checking the air filter; a dirty or clogged filter can significantly restrict airflow, leading to performance issues. Next, inspect the spark plugs for wear or damage, as faulty plugs can cause misfiring and contribute to a rough idle. Moving on, examine the fuel system, including the fuel filter and injectors, for any blockages that could hinder fuel delivery. Additionally, look for vacuum leaks by visually inspecting hoses and connections, as these can disrupt the air-fuel mixture. Testing the mass airflow sensor is also crucial, as a malfunction here can affect engine performance. Don’t overlook the ignition system; ensure that components like the ignition coil and distributor are functioning correctly. Finally, if the issue persists, consider performing a comprehensive engine diagnostic to identify any mechanical problems, such as low compression or timing issues. By following this structured approach, you can effectively diagnose and address the rough idle in your vehicle, ensuring optimal performance.

What are the common problems that could cause a rough idle in a 2018 Ford Police Interceptor Sedan?

When dealing with a rough idle in a 2018 Ford Police Interceptor Sedan, it's essential to consider several common issues that could be affecting engine performance. One of the primary culprits is a dirty or clogged air filter, which can significantly restrict airflow to the engine, leading to an uneven idle. Additionally, faulty spark plugs are notorious for causing misfires, which can also contribute to a rough idle. Another potential issue is vacuum leaks; these can disrupt the air-fuel mixture, resulting in instability during idling. Fuel system problems, such as a clogged fuel filter or a malfunctioning fuel pump, can further exacerbate the situation by hindering fuel delivery. Moreover, a malfunctioning mass airflow sensor can throw off the air-fuel ratio, leading to rough idling as well. Lastly, issues with the Exhaust Gas Recirculation (EGR) valve can impact the combustion process, causing the engine to idle roughly. By identifying and addressing these common problems, DIY enthusiasts can effectively restore smooth engine performance in their Ford Police Interceptor Sedan.

How urgent is it to address the rough idle in a 2018 Ford Police Interceptor Sedan?

Addressing a rough idle in a 2018 Ford Police Interceptor Sedan is not just a matter of convenience; it is a critical safety concern that demands immediate attention. A rough idle can signal serious underlying issues within the engine or related components, which, if left unresolved, may escalate into more significant problems, potentially leading to engine failure or costly repairs. For police vehicles, where performance and reliability are essential for operational effectiveness, neglecting such symptoms can compromise safety during high-stakes situations. Additionally, a rough idle can negatively impact fuel efficiency, further straining budgets and resources. Therefore, it is crucial for owners and operators to prioritize diagnosing and rectifying any rough idle issues to ensure the vehicle remains in optimal working condition, safeguarding both the driver and the community they serve.

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