2008 Volvo S60 Has Rough Idle

Diagnosing Causes of Rough Idle in Your 2008 Volvo S60 and How to Restore Smooth Performance

Find Repair Location
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 2008 Volvo S60 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 2008 Volvo S60 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.

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 2008 Volvo S60?

To effectively diagnose a rough idle in your 2008 Volvo S60, start with a systematic approach that prioritizes simpler checks before delving into more complex issues. Begin by using an OBD-II scanner to check for any fault codes, as these can provide immediate insights into potential problems. Next, observe the engine RPM at idle; if it’s higher than normal, this could indicate an underlying issue. Pay attention to any unusual sounds, such as hissing, which may suggest vacuum leaks. Inspect the vacuum lines visually for cracks or breaks, as these can significantly impact engine performance. To further investigate, apply soapy water to connections to identify air leaks, which can also contribute to a rough idle. If these preliminary checks do not resolve the issue, consider cleaning or replacing the idle air control valve, as a malfunctioning valve can disrupt idle stability. Lastly, if you encounter a P0505 code, it’s essential to diagnose and address the idle air control system issue, ensuring that all potential causes are thoroughly explored. By following this structured diagnostic approach, you can effectively identify and resolve the rough idle in your Volvo S60.

What are the common problems that could cause a rough idle in a 2008 Volvo S60?

When diagnosing a rough idle in a 2008 Volvo S60, it's essential to consider several common problems that could be at play. One significant issue could be a malfunctioning coolant temperature sensor, which may send incorrect data to the Engine Control Unit (ECU). This miscommunication can lead to an unstable idle and even engine stalling, making it crucial to check this sensor first. Additionally, if the vehicle exhibits rough idling but appears to run smoothly otherwise, the problem might stem from the instrument cluster. In such cases, inspecting the fuse for the instrument panel and utilizing a Volvo scanner to read fault codes from the instrument cluster module can provide valuable insights. By addressing these potential issues promptly, you can help ensure your Volvo S60 operates smoothly and avoid more severe complications down the line.

How urgent is it to address the rough idle issue in my 2008 Volvo S60?

Addressing the rough idle issue in your 2008 Volvo S60 is crucial for maintaining the vehicle's performance and longevity. A rough idle can be indicative of underlying problems such as faulty spark plugs, ignition system failures, or issues with the idle control valve. If left unaddressed, these issues can escalate, leading to more severe mechanical failures and costly repairs down the line. Moreover, the fluctuation in RPM while idling not only affects your car's efficiency but can also compromise your driving experience. Ignoring this symptom may result in diminished performance and could even pose safety risks if the vehicle becomes unreliable. Therefore, it is essential to prioritize the diagnosis and repair of a rough idle to ensure your Volvo S60 operates smoothly and efficiently, safeguarding both your investment and 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.

2008 Volvo S60 Rough Idle: Causes & Repairs | RepairPal