Dodge Avenger Has Rough Idle

Common Causes of Rough Idling in Your Dodge Avenger 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 Dodge Avenger 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 Dodge Avenger 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.

Brake caliper failure occurs in two different ways, and they create different symptoms.

The caliper can become stuck, in which case it won't release the brake pads. The seized caliper will cause the vehicle to brake constantly on one side, forcing the car to move toward that side. This pulling will be accompanied by a strong odor from one wheel.

Another way calipers fail is by leaking. If the caliper leaks, the brake pedal will feel too easy to push, and will sink all the way to the floor when held. Braking will become less effective the longer this goes on. There may also be brake fluid leaking onto the wheel.

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.

Troubleshooting Rough Idle in a Dodge Avenger

When troubleshooting a rough idle in your Dodge Avenger, it's essential to adopt a methodical diagnostic approach. Start by inspecting for vacuum leaks, as these can significantly affect engine performance. Begin with a visual inspection of hoses and connections, then use carburetor or brake cleaner to identify leaks by spraying around the throttle body while the engine idles. Next, check the condition of your spark plugs; worn or improperly gapped plugs can lead to misfires and rough idling. If the spark plugs appear fine, turn your attention to the ignition coil, as a malfunction here can disrupt the spark needed for smooth operation. Additionally, ensure that the air-fuel mixture is balanced; an imbalance can stem from a dirty air filter or throttle body, which should also be cleaned if necessary. By following this structured approach, you can effectively diagnose and resolve the rough idle issue, ensuring your Dodge Avenger runs smoothly.

How to Diagnose and Fix Rough Idle Issues in a Dodge Avenger?

When tackling rough idle issues in a Dodge Avenger, it's essential to understand the common problems that can lead to this frustrating condition. One of the primary culprits is a vacuum leak, which can occur in various areas such as the PCV valve or throttle body. Inspecting these components for any signs of wear or damage is crucial. Additionally, the condition of the spark plugs and ignition coil should not be overlooked, as faulty plugs or coils can significantly impact engine performance. Another area to examine is the throttle body; dirt or grime buildup can disrupt the air-fuel mixture, leading to rough idling. Furthermore, the throttle position sensor plays a vital role in engine management, and any malfunction here can result in erratic idling and poor acceleration. Lastly, don’t forget to check the flapper doors on the intake manifold, as gumming can cause fluctuations in idle. By systematically addressing these common problems, you can effectively diagnose and resolve rough idle issues, ensuring your Dodge Avenger runs smoothly.

Why is My Dodge Avenger Idling Rough and What Should I Do?

When your Dodge Avenger is idling roughly, it’s crucial to address the issue promptly to avoid more severe consequences. Ignoring symptoms like a fluctuating RPM needle or a check engine light can lead to significant engine damage or even safety hazards while driving. A vacuum leak, for instance, can disrupt the air-fuel mixture, potentially causing the engine to run inefficiently and increasing the risk of stalling. Similarly, worn spark plugs or a malfunctioning ignition coil can lead to poor combustion, which not only affects performance but can also result in costly repairs down the line. Additionally, a dirty or faulty throttle body can impede airflow, exacerbating the rough idle and potentially leading to engine overheating. By taking immediate action—whether it’s inspecting for vacuum leaks, replacing spark plugs, or cleaning the throttle body—you can ensure your vehicle runs smoothly and safely, ultimately saving time and money on repairs. Don’t wait for the problem to escalate; addressing these issues early can help maintain the longevity and reliability of your Dodge Avenger.

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Dodge Avenger Rough Idle: Causes & Repair Costs | RepairPal