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.

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Written by RepairPal Car Genius

Updated

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2017 Lincoln MKZ Has Rough Idle

Diagnosing the Causes of Rough Idling in Your 2017 Lincoln MKZ and How to Restore Smooth Performance

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Reviewed by

Aisha

Written by RepairPal Car Genius

Updated January 14, 2025

21% chance it's the

Spark Plugs

15% chance it's the

Ignition Coil

64% chance it's

Something else

The most common reasons a 2017 Lincoln MKZ 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.

What are the best Lincoln repair shops?

RepairPal Certified shops can diagnose and repair your 2017 Lincoln MKZ engine and performance issues. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.

How much does it cost to fix a 2017 Lincoln MKZ 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:

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.
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.
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.
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 steps to diagnose a rough idle in a 2017 Lincoln MKZ?

To effectively diagnose a rough idle in your 2017 Lincoln MKZ, start with a systematic approach that prioritizes simpler checks before moving on to more complex diagnostics. Begin by using an OBD-II scanner to check for any error codes, as these can provide immediate insights into potential issues. Next, inspect the air filter for clogs or dirt, as a restricted airflow can significantly impact engine performance. Following this, examine the spark plugs for wear or fouling, since misfires caused by faulty plugs are a common culprit of rough idling. Don’t overlook the fuel system; check for clogs in the fuel filter or issues with the fuel injectors that could disrupt fuel delivery. Additionally, assess the PCV valve, as a malfunction here can also affect idle quality. Cleaning the throttle body is another crucial step, as dirt can interfere with the air-fuel mixture. Finally, inspect for any vacuum leaks, which can create an imbalance in the engine's air-fuel mixture. By following this structured diagnostic approach, you can identify and resolve the underlying causes of a rough idle in your vehicle.

What are the common problems that could cause a rough idle in a 2017 Lincoln MKZ?

When dealing with a rough idle in your 2017 Lincoln MKZ, it's essential to consider several common problems that could be affecting your vehicle's performance. One of the first areas to check is the air filter; a dirty or clogged air filter can significantly restrict airflow to the engine, leading to an uneven idle. Additionally, inspect the spark plugs, as worn or faulty plugs can cause misfiring, which is a frequent culprit behind rough idling. Another critical aspect to examine is the vacuum system for any leaks, as these can disrupt the air-fuel mixture necessary for smooth engine operation. Fuel system issues, such as a clogged fuel filter or malfunctioning fuel injectors, can also impact performance and contribute to a rough idle. Furthermore, the mass airflow sensor plays a vital role in regulating the air-fuel mixture, and if it's faulty, it can lead to idling problems. Lastly, don't overlook the EGR valve; if it's malfunctioning, it can disrupt the combustion process, resulting in a rough idle. By addressing these common issues through regular maintenance and timely repairs, you can enhance your vehicle's performance and enjoy a smoother driving experience.

How urgent is it to address the rough idle in a 2017 Lincoln MKZ?

Addressing a rough idle in your 2017 Lincoln MKZ is not just a matter of comfort; it is crucial for the vehicle's overall health and performance. A rough idle can indicate underlying engine problems, such as issues with the fuel or ignition systems, which, if left unattended, may lead to more severe complications. Ignoring this symptom can result in decreased fuel efficiency and poor engine performance, ultimately risking significant damage that could require costly repairs. Moreover, a rough idle may signal serious issues that could escalate if not promptly addressed, potentially compromising your safety on the road. Regular maintenance and timely repairs are essential to prevent these risks, ensuring that your MKZ operates smoothly and reliably. Therefore, it is imperative to take action at the first sign of a rough idle to maintain the vehicle's performance and longevity.