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2017 Q50 3.0t Rough Idle and Misfire Code P0301

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Mike T. · rep 0 · May 25, 3:46 AM · 1 replies · solved · Question

Vehicle: 2017 Infiniti Q50 3.0t Luxe

Hey everyone,

I've got a 2017 Infiniti Q50 3.0t with about 75,000 miles, and recently it's developed a really rough idle. It feels like the engine is shaking more than usual, especially when I'm stopped at a light. The check engine light came on, and when I scanned it, I got a P0301 code, indicating a misfire on cylinder 1.

The car still drives, but it doesn't feel as smooth as it used to, and I'm worried about potential damage. I've heard these engines can be a bit sensitive. Any ideas on what I should check first? Could it be spark plugs, or something more serious?

Thanks for any help!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 3:46 AM

0

ClearTheCode admin answer:

A P0301 code on your 2017 Infiniti Q50 3.0t indicates a misfire detected in cylinder 1. This is a common issue with several potential causes. Here's a breakdown of what to check and next steps:

  1. Diagnose the Cause:

    • Spark Plug: The most common culprit. A worn, fouled, or improperly gapped spark plug in cylinder 1 can cause a misfire. Given your mileage, it's a good time to inspect or replace them, especially if they haven't been done recently.
    • Ignition Coil: The ignition coil for cylinder 1 might be failing. You can sometimes swap the coil from cylinder 1 to another cylinder (e.g., cylinder 3) and see if the misfire code follows the coil (e.g., P0303). If it does, the coil is bad.
    • Fuel Injector: A clogged, faulty, or dirty fuel injector for cylinder 1 can prevent proper fuel delivery. Fuel system cleaner might help if it's minor, but a failing injector will need replacement.
    • Vacuum Leak: Less common for a single cylinder misfire, but a vacuum leak near cylinder 1 could lean out the mixture.
    • Compression Issue: In more severe cases, low compression in cylinder 1 due to valve issues or piston rings could be the cause. This requires a compression test.

  2. When to See a Shop:

    • If you're not comfortable diagnosing or replacing components like spark plugs or ignition coils yourself.
    • If the misfire persists after checking/replacing basic components.
    • If you suspect a fuel injector or a compression issue, as these require specialized tools and expertise.
    • Continued driving with a severe misfire can damage your catalytic converter due to unburnt fuel entering the exhaust system. Address this promptly.
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