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2020 Equinox Rough Idle & P0301 Code

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Ryan M. · rep 0 · May 22, 2:31 AM · 1 replies · solved · Question

Vehicle: 2020 Chevrolet Equinox LT

My 2020 Chevrolet Equinox LT, 1.5L turbo, has developed a really rough idle, especially when cold. The Check Engine Light came on, and my scanner shows a P0301 code, which is a Cylinder 1 Misfire Detected.

I've already checked the spark plug on cylinder 1, and it looked okay, though I didn't replace it. The car also feels a bit sluggish under acceleration. It's got about 60,000 miles on it.

Could this be a bad ignition coil, or maybe an injector? What's the best way to diagnose this without just throwing parts at it? Any common issues with the 1.5L engine causing misfires?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 2:31 AM

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ClearTheCode admin answer:

A P0301 code on your 2020 Chevrolet Equinox indicates a misfire specifically in Cylinder 1. This means that the combustion process in that cylinder is not occurring correctly or consistently. Given your symptoms of a rough idle and sluggish acceleration, this is a clear indication of an issue that needs attention.

Here's a systematic approach to diagnose a P0301 code:

  1. Ignition System:

    • Spark Plug: Even if it looks okay, a faulty spark plug is a common cause. Consider swapping the Cylinder 1 plug with an adjacent cylinder's plug (e.g., Cylinder 2) and see if the misfire code moves to Cylinder 2. If it does, the plug is the issue.
    • Ignition Coil: A failing ignition coil for Cylinder 1 is another very common culprit. You can perform a similar swap test: move the Cylinder 1 coil to another cylinder. If the P0301 code changes to P0302 (for Cylinder 2), then the coil is bad.

  2. Fuel System:

    • Fuel Injector: A clogged or faulty fuel injector for Cylinder 1 can prevent adequate fuel delivery. This is harder to test at home without specialized tools, but a shop can check injector pulse and spray pattern.
    • Fuel Pressure: Low fuel pressure can cause misfires across multiple cylinders, but if it's isolated to Cylinder 1, the injector is more likely.

  3. Compression Issues:

    • Low Compression: Less common but possible, low compression in Cylinder 1 (due to a bad valve, head gasket, or piston ring) will cause a misfire. A compression test or leak-down test would be needed.

When to see a shop:

  • If swapping spark plugs and ignition coils doesn't move the misfire code.
  • If you suspect a fuel injector issue, as professional diagnosis and replacement are typically required.
  • If the misfire is persistent and you notice a strong smell of unburnt fuel, which can damage the catalytic converter over time.
  • For compression testing or more advanced diagnostics that require specialized tools.
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