1998 Mercury Tracer Has Rough Idle

Common Causes of Rough Idling in Your 1998 Mercury Tracer 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 1998 Mercury Tracer 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 1998 Mercury Tracer 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.

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.

What are the initial diagnostic steps to take for a rough idle in a 1998 Mercury Tracer?

When addressing a rough idle in your 1998 Mercury Tracer, it's essential to adopt a methodical diagnostic approach that begins with the most straightforward checks. Start by inspecting for any vacuum leaks, as these can significantly disrupt engine performance and are often the root cause of rough idling. Next, examine the spark plugs for wear or damage, since faulty plugs can lead to misfires and uneven engine operation. Following this, assess the ignition coil, as issues here can also contribute to a rough idle. To further evaluate the ignition system, utilize a Spark Gap Tester to check for any weaknesses or faults that may be affecting performance. If your vehicle features a 2.0L SPI engine, pay close attention to any RPM fluctuations or stalling at idle, as these symptoms may indicate specific engine-related issues. By systematically working through these diagnostic steps, you can effectively identify and address the underlying causes of a rough idle, ensuring your Mercury Tracer runs smoothly.

What are the common problems that could cause a rough idle in a 1998 Mercury Tracer?

When dealing with a rough idle in a 1998 Mercury Tracer, it's crucial to consider several common problems that could be affecting your vehicle's performance. One of the primary suspects is a vacuum leak, which can disrupt the air-fuel mixture and lead to an unstable idle. Additionally, spark plug issues, such as wear or fouling, can prevent the engine from firing smoothly, resulting in a rough idle. Another potential culprit is a malfunctioning ignition coil, which is responsible for delivering the necessary spark to ignite the fuel in the engine cylinders. Beyond these, other factors like a clogged fuel filter can restrict fuel flow, while failing electrical components may cause erratic engine behavior. Uneven compression across the cylinders and a faulty idle bleed recirculation system can also contribute to the problem. By systematically checking these components, DIYers can identify and rectify the underlying issues, ensuring a smoother and more efficient engine operation.

How urgent is it to address the rough idle in my 1998 Mercury Tracer?

Addressing a rough idle in your 1998 Mercury Tracer is not just a matter of comfort; it is crucial for the vehicle's overall health and performance. A rough idle can indicate underlying issues such as a clogged fuel filter, faulty spark plugs, or a malfunctioning oxygen sensor, which, if left unattended, can lead to more severe problems. Ignoring these symptoms may result in decreased fuel efficiency, engine misfires, and even damage to critical engine components, potentially leading to costly repairs down the line. Moreover, a rough idle can serve as a warning sign of more serious mechanical failures that could compromise your vehicle's safety. Therefore, it is essential to prioritize this issue and conduct regular maintenance checks. By addressing the rough idle promptly, you not only enhance your vehicle's performance but also prevent further complications, ensuring a smoother and safer driving experience.

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