2020 Toyota Tacoma Has Rough Idle

Common Causes of Rough Idling in Your 2020 Toyota Tacoma and How to Resolve Them

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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 2020 Toyota Tacoma 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 2020 Toyota Tacoma 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.

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 steps to diagnose a rough idle in a 2020 Toyota Tacoma?

To effectively diagnose a rough idle in your 2020 Toyota Tacoma, start with a systematic approach that prioritizes simpler checks before delving into 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 spark plugs for wear or damage, as faulty plugs can significantly affect engine performance. A clean air filter is crucial for maintaining the proper air-fuel mixture, so ensure it is not clogged or dirty. Additionally, examine the vacuum hoses for leaks, which can disrupt engine operation. Moving on, assess the fuel system by checking the fuel pump, filter, and injectors to confirm they are functioning correctly. A dirty throttle body can also lead to rough idling, so inspect it for cleanliness and proper operation. Don’t forget to check engine compression, as low levels can indicate deeper mechanical issues. Lastly, evaluate the idle air control valve and exhaust system for any restrictions that could be impacting idle quality. By following this structured diagnostic approach, you can identify and address the root cause of the rough idle in your Tacoma, ensuring a smoother driving experience.

What are the common causes of a rough idle in a 2020 Toyota Tacoma?

When dealing with a rough idle in your 2020 Toyota Tacoma, it's essential to understand the common problems that could be at play. One of the first things to check is the air filter; a dirty or clogged air filter can significantly restrict airflow to the engine, leading to performance issues. Next, inspect the spark plugs, as worn or faulty plugs can cause misfiring, which is a primary contributor to a rough idle. Additionally, look for any vacuum leaks in the system, as these can disrupt the air-fuel mixture, further affecting engine performance. Fuel system issues, such as a clogged fuel filter or malfunctioning fuel injectors, can also impede fuel delivery, resulting in an uneven idle. Lastly, consider the mass airflow sensor; if it's faulty, it may provide incorrect readings that can throw off the air-fuel mixture. By addressing these common issues through regular maintenance and timely repairs, you can effectively resolve the rough idle problem and ensure your Tacoma runs smoothly.

How urgent is it to address the rough idle in a 2020 Toyota Tacoma?

Addressing a rough idle in your 2020 Toyota Tacoma should be treated with a sense of urgency, as it can indicate underlying engine problems that may escalate if left unattended. A rough idle not only affects the vehicle's performance but can also lead to decreased fuel efficiency and increased wear on engine components, potentially resulting in costly repairs. Moreover, neglecting this symptom could compromise the safety and reliability of your vehicle, as it may be a precursor to more serious mechanical failures. Regular maintenance and prompt attention to such issues are crucial in preserving the longevity of your Tacoma. Therefore, if you notice a rough idle, it is advisable to consult a qualified mechanic to diagnose and resolve the issue swiftly, ensuring your vehicle remains in optimal condition and operates safely on the road.

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