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2020 RDX Check Engine Light & Rough Idle - What's going on?

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Diana O. · rep 0 · May 22, 4:56 AM · 1 replies · solved · Question

Vehicle: 2020 Acura RDX Technology Package

My 2020 Acura RDX, with about 45,000 miles, suddenly developed a rough idle this morning, and the Check Engine Light came on. It feels like the engine is shaking more than usual when I'm stopped at a light. When I accelerate, it seems to smooth out a bit, but the idle is definitely off.

I haven't had a chance to get it scanned yet, but I'm wondering what the common culprits might be for this combination of symptoms on an RDX of this generation. Could it be something simple like spark plugs, or something more serious? I'm a bit worried about driving it too much like this.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 4:56 AM

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ClearTheCode admin answer:

A rough idle accompanied by a Check Engine Light (CEL) on your 2020 Acura RDX indicates an issue that needs prompt attention. While it smooths out during acceleration, the idle problem suggests a potential misfire or an air/fuel mixture imbalance at lower RPMs.

Here's a breakdown of common causes and diagnostic steps:

  1. Get the Codes Read: This is the absolute first step. Visit an auto parts store for a free scan or use your own OBD-II scanner. The codes (e.g., P030x for misfires, P0171/P0174 for lean conditions) will provide crucial direction.
  2. Ignition System Issues:
    • Spark Plugs: Worn or fouled spark plugs are a very common cause of misfires and rough idle. Given your mileage, it's worth checking their condition.
    • Ignition Coils: A failing ignition coil for one or more cylinders can cause intermittent misfires, leading to a rough idle.
  3. Fuel System Problems:
    • Clogged Fuel Injectors: A dirty or clogged fuel injector can prevent a cylinder from getting enough fuel, causing a misfire.
    • Low Fuel Pressure: A failing fuel pump or clogged fuel filter (less common on newer vehicles with lifetime filters) could lead to insufficient fuel delivery.
  4. Air Intake Issues:
    • Vacuum Leaks: Leaks in the intake manifold gasket, vacuum hoses, or PCV valve can introduce unmetered air, causing a lean condition and rough idle.
    • Dirty Mass Air Flow (MAF) Sensor: A contaminated MAF sensor can send incorrect air intake readings to the engine computer, disrupting the air/fuel mixture.
    • Dirty Throttle Body: Carbon buildup on the throttle body can restrict airflow at idle.
  5. Exhaust System: A partially clogged catalytic converter can also cause rough idle and reduced performance, though usually accompanied by other symptoms like power loss.

When to See a Shop:

If the OBD-II scan reveals multiple or complex codes, or if you're uncomfortable performing basic checks, it's best to take your RDX to a qualified technician. Driving with a persistent misfire can damage the catalytic converter over time, leading to a much more expensive repair. Address this issue promptly.

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