2014 Ram ProMaster 1500 Has Rough Idle

Diagnosing Causes of Rough Idle in Your 2014 Ram ProMaster 1500 and Solutions 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 2014 Ram ProMaster 1500 has rough idle are a vacuum leak, an issue with the spark plugs, or a problem with the ignition coil.
  • Spark Plugs: A worn or fouled spark plug can cause misfires, rough idling, and decreased fuel efficiency due to incomplete combustion.
  • 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 2014 Ram ProMaster 1500 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.

Brake rotors are mainly maintenance free, but when they have been subjected to abnormally hard use, the heat they absorb can cause the metal to turn blue, and cracking to occur. When this occurs, customers often specify they have lost braking power, or the vehicle's brakes are making noise. There may be no symptoms at all related to changing the brake rotors, since it is recommended to change brake rotors on most modern vehicles when performing a standard brake service.

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 2014 Ram ProMaster 1500?

To effectively diagnose a rough idle in your 2014 Ram ProMaster 1500, start with the simplest checks to identify potential issues. Begin by inspecting for vacuum leaks, as these can significantly impact engine performance. With the engine running, carefully spray carburetor or brake cleaner around the throttle body; if the idle changes, you’ve likely found a leak. Next, examine the spark plugs for wear or damage, as faulty plugs can lead to misfires and rough idling. Following this, check the ignition coil, which is crucial for proper spark generation; any signs of wear or malfunction here should be addressed. Additionally, ensure that all engine components, including the fuel and air intake systems, are functioning correctly, as any irregularities can contribute to idle issues. If you notice any unusual sounds or performance drops, utilizing diagnostic codes can provide insights into specific sensor problems. Lastly, don’t overlook the importance of routine maintenance; cleaning the cold air intake and throttle body can often resolve minor idle issues. By following this structured approach, you can effectively diagnose and remedy rough idle problems, enhancing the overall performance of your vehicle.

What are the common causes of a rough idle in a 2014 Ram ProMaster 1500?

When dealing with a rough idle in your 2014 Ram ProMaster 1500, it's essential to consider several common problems that could be affecting your vehicle's performance. One of the primary culprits is a vacuum leak, which can disrupt the air-fuel mixture and lead to an unstable idle. Additionally, spark plug issues are another frequent cause; worn or fouled spark plugs can fail to ignite the fuel properly, resulting in a rough engine operation. Ignition coil problems can also contribute to this issue, as faulty coils may cause misfires that disrupt the engine's rhythm. Furthermore, excessive carbon buildup on the throttle body can hinder airflow, leading to poor engine performance and rough idling. Lastly, engine misfires, often linked to bad ignition coils, can create noticeable vibrations and instability at idle. By systematically checking these areas, DIYers can often identify and rectify the underlying issues causing the rough idle in their Ram ProMaster.

How urgent is it to address the rough idle in a 2014 Ram ProMaster 1500?

Addressing a rough idle in your 2014 Ram ProMaster 1500 is not just a matter of comfort; it is crucial for the vehicle's overall health and performance. Ignoring this symptom can lead to a cascade of problems, including decreased fuel efficiency and potential engine misfires, which may escalate into more severe engine damage over time. The rough idle could indicate underlying issues such as faulty ignition coils or excessive carbon buildup, both of which require immediate attention to prevent further complications. By taking prompt action, you not only enhance the vehicle's reliability but also safeguard against costly repairs in the future. Therefore, if you notice your ProMaster idling roughly, it is essential to diagnose and address the issue as soon as possible to maintain optimal performance and ensure your vehicle remains safe and efficient on the road.

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2014 Ram ProMaster 1500 Rough Idle: Causes & Repair Costs