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Rough Idle and Misfire on 2019 ILX Standard

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Mike T. · rep 0 · May 26, 3:29 AM · 1 replies · solved · Question

Vehicle: 2019 Acura ILX Standard

My 2019 Acura ILX Standard model has developed a really rough idle recently. When I'm stopped at a light or in traffic, the engine vibrates noticeably, and it feels like it's struggling to maintain a smooth idle. Sometimes, it even feels like it's about to stall, though it hasn't actually died yet.

I've also noticed a slight hesitation during acceleration, and the fuel economy seems to have dipped a bit. I haven't seen any check engine lights yet, but I'm concerned something serious might be going on. It's got about 60,000 miles on it.

Could this be spark plugs, or something more complex like an injector or coil pack? Any specific things I should check or common issues for the 2019 ILX that could cause a rough idle and potential misfire?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 26, 3:29 AM

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ClearTheCode admin answer:

A rough idle and potential misfire on your 2019 Acura ILX Standard can stem from several common issues. Even without a 'Check Engine' light, these symptoms indicate your engine isn't running optimally. Here's what to consider:

  1. Spark Plugs: Worn or fouled spark plugs are a very common cause of misfires and rough idling. They should be inspected and replaced according to your vehicle's maintenance schedule, typically around 60,000-100,000 miles for iridium plugs.
  2. Ignition Coils: Each spark plug has an ignition coil. If a coil fails, that cylinder will misfire. This often presents as a distinct shudder or loss of power. A diagnostic scan can usually pinpoint which cylinder is misfiring (e.g., P0301 for cylinder 1 misfire).
  3. Fuel Injectors: A clogged or faulty fuel injector can prevent a cylinder from receiving enough fuel, leading to a lean misfire. Fuel injector cleaner can sometimes help, but a failed injector needs replacement.
  4. Air Intake Issues: A dirty or clogged air filter, a faulty Mass Air Flow (MAF) sensor, or a vacuum leak in the intake system can disrupt the air-fuel mixture, causing rough idle. Inspect visible hoses for cracks.
  5. Throttle Body: A dirty throttle body can restrict airflow at idle, leading to an inconsistent idle speed. Cleaning it can often resolve this.
  6. Oxygen Sensors: Faulty O2 sensors can send incorrect data to the engine control unit (ECU), leading to an improper air-fuel mixture and rough running.

When to See a Shop:

  • If the 'Check Engine' light illuminates, especially if it's flashing (indicating a severe misfire that could damage the catalytic converter).
  • If the rough idle worsens or is accompanied by a significant loss of power or strong fuel smell.
  • A professional diagnostic scan is highly recommended, even without a 'Check Engine' light. Modern vehicles store 'pending' codes or 'history' codes that can reveal intermittent issues or early signs of component failure, such as P030x codes (where x is the cylinder number).
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