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2017 V60 Cross Country Rough Idle & Misfire Codes

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Mike T. · rep 0 · May 25, 3:52 AM · 1 replies · solved · Question

Vehicle: 2017 Volvo V60 Cross Country T5

Hello everyone,

My 2017 Volvo V60 Cross Country T5, with about 60,000 miles, has developed a really rough idle and occasionally feels like it's misfiring under light acceleration. The check engine light came on, and when I scanned it, I got multiple misfire codes: P0301 (Cylinder 1 Misfire), P0303 (Cylinder 3 Misfire), and P0300 (Random/Multiple Cylinder Misfire Detected).

The car feels a bit shaky when stopped, and sometimes when I'm driving slowly, it will hesitate. I'm wondering if this could be spark plugs, ignition coils, or something else entirely. I haven't changed the spark plugs yet, so that's probably due.

Any insights or common issues with these models that could cause multiple misfires? Thanks for your help!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 3:52 AM

0

ClearTheCode admin answer:

The multiple misfire codes (P0301, P0303, P0300) on your 2017 Volvo V60 Cross Country T5 indicate that one or more cylinders are not firing correctly, leading to rough idle and hesitation. This is a common issue with several potential causes. Here's a diagnostic approach:

  1. Inspect and Replace Spark Plugs: Given your mileage (60,000 miles), spark plugs are a prime suspect, especially if they haven't been changed. Worn spark plugs can lead to weak or inconsistent spark, causing misfires. Start by inspecting the plugs from cylinders 1 and 3, but it's generally recommended to replace all of them if they are due.
  2. Check Ignition Coils: Each cylinder has its own ignition coil. A failing coil will not provide sufficient voltage to ignite the fuel-air mixture. You can try swapping the ignition coils from the misfiring cylinders (1 and 3) with coils from non-misfiring cylinders. If the misfire code follows the coil, you've found the culprit. Consider replacing them in pairs or all four if they are original.
  3. Inspect Fuel Injectors: A clogged or faulty fuel injector can prevent a cylinder from receiving enough fuel, leading to a lean misfire. While less common for multiple specific cylinders, it's possible. You can test injector resistance or listen to them with a stethoscope for consistent clicking.
  4. Check for Vacuum Leaks: A vacuum leak in the intake system can cause unmetered air to enter the engine, leading to a lean condition and misfires, often across multiple cylinders. Listen for hissing sounds and visually inspect all vacuum lines and intake manifold gaskets.
  5. Perform a Compression Test: This is a more advanced step but can rule out internal engine issues like worn piston rings or a faulty valve, which would cause a loss of compression and subsequent misfire.

Common Causes for Multiple Misfires:

  • Worn or fouled spark plugs.
  • Failing ignition coils.
  • Clogged or faulty fuel injectors.
  • Vacuum leaks in the intake system.
  • Low fuel pressure (faulty fuel pump or regulator).
  • Contaminated fuel.
  • Faulty Mass Air Flow (MAF) sensor or Oxygen (O2) sensors.

When to See a Shop:

  • If replacing spark plugs and swapping ignition coils doesn't resolve the issue.
  • If you suspect fuel system issues (injectors, fuel pump) or vacuum leaks that you cannot locate.
  • If a compression test is needed, or if you suspect internal engine damage.
  • If you require advanced diagnostics to pinpoint the exact cause, as a professional shop can perform more detailed tests like fuel pressure checks, injector flow tests, and comprehensive sensor diagnostics.
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