Dodge B350 Has Rough Idle

Troubleshooting Causes of Rough Idle in Your Dodge B350 and How to Restore Smooth Performance

Find Repair Location
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 Dodge B350 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 B350 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.

Troubleshooting Rough Idle in a Dodge B350

When troubleshooting a rough idle in your Dodge B350, begin by inspecting the air filter, as a clogged filter can significantly disrupt airflow and lead to unstable idling. If the air filter appears clean, proceed to check the throttle position sensor and other related sensors, as their malfunction can directly impact engine performance. Next, examine the throttle body and the idle air control (IAC) valve; cleaning these components can often resolve idle issues by ensuring proper airflow and idle speed control. If these initial checks do not yield results, consider conducting voltage tests on the idle motor connector to assess the electrical components involved in the idling process. By following this structured approach, you can effectively diagnose and address the rough idle, helping to maintain your vehicle's performance and prevent further engine complications.

What Could Cause a Rough Idle in a Dodge B350?

When experiencing a rough idle in your Dodge B350, it's essential to consider several common problems that could be at play. One of the primary culprits is the idle air control motor, which regulates the engine's idle speed; if it's faulty, you may notice erratic idling or stalling during hot restarts. Additionally, the fuel injection system plays a critical role in maintaining smooth engine operation. A clogged fuel injector, failing fuel pump, or dirty fuel filter can disrupt the fuel flow, leading to rough idling. Ignition components, including the ignition control module, spark plugs, and plug wires, are also vital; any malfunction here can cause irregular ignition, resulting in a shaky idle. Furthermore, a defective airflow sensor can throw off the air-fuel mixture, exacerbating the issue. Symptoms such as engine shaking, fluctuating RPMs, or unusual noises while stationary can indicate these problems. Lastly, don't overlook the potential impact of vacuum line issues or a noisy Throttle Position Sensor, which can affect idle stability. By understanding these common problems, you can take the first steps toward diagnosing and fixing the rough idle in your Dodge B350.

Why is My Dodge B350 Idling Rough and What Should I Do?

When your Dodge B350 is idling rough, it’s crucial to address the issue promptly to avoid further complications. Ignoring symptoms like a shaky idle can lead to more severe mechanical problems, potentially resulting in costly repairs or even unsafe driving conditions. For instance, dirty fuel injectors or loose spark plug wires can disrupt engine performance, and if left unchecked, they may cause engine misfires or stalling. Additionally, an incorrect idle speed can strain the engine, leading to premature wear and tear. A faulty idle air control motor can exacerbate these issues, causing erratic idling and stalling, particularly during hot restarts. Therefore, it’s essential to diagnose and resolve these problems quickly. While some fixes may be manageable for a DIY enthusiast, consulting a qualified mechanic is advisable for a thorough evaluation, especially if the rough idling persists. Taking action now not only enhances your vehicle's performance but also ensures your safety on the road.

You’ve got options with RepairPal

Whether you need a more accurate auto repair estimate or help finding a reputable shop in your area, we’ve got you covered.

Dodge B350 Car Idling Rough