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2021 RDX Rough Idle & Check Engine Light - Spark Plugs?

0

Mike T. · rep 0 · May 25, 3:43 AM · 1 replies · solved · Question

Vehicle: 2021 Acura RDX Technology Package

Hi everyone,

I'm having an issue with my 2021 Acura RDX Technology Package. It's got about 55,000 miles on it now. Recently, I've noticed a rough idle, especially when the engine is cold, and the car feels a bit sluggish under acceleration. The 'Check Engine' light also came on a few days ago.

I used an OBD-II scanner and pulled a couple of codes: P0301 (Cylinder 1 Misfire Detected) and P0300 (Random/Multiple Cylinder Misfire Detected). Given the mileage, could this be a sign that it's time to replace the spark plugs? I haven't done them yet.

Is replacing spark plugs on the 2.0L turbo engine in the RDX a difficult job? Are there any specific brands or types of spark plugs recommended? Any advice on what else I should check besides the plugs would be great!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 3:43 AM

0

ClearTheCode admin answer:

Experiencing a rough idle, sluggish acceleration, and misfire codes (P0300, P0301) on your 2021 Acura RDX with 55,000 miles strongly suggests that worn spark plugs are a primary suspect. The recommended interval for spark plug replacement on the 2.0L turbocharged engine is typically around 60,000-105,000 miles, but driving conditions can accelerate wear.

Causes of Misfires (P0300, P0301):

  1. Worn Spark Plugs: The most common cause. Electrodes degrade over time, leading to a weaker spark and incomplete combustion.
  2. Faulty Ignition Coils: A failing coil pack for Cylinder 1 could be the direct cause of P0301.
  3. Fuel System Issues: Clogged fuel injector for Cylinder 1, low fuel pressure.
  4. Compression Issues: Less common, but low compression in Cylinder 1 could cause a misfire.
  5. Vacuum Leaks: Can lead to an imbalanced air-fuel mixture.

Spark Plug Replacement on the 2.0L Turbo: This is a moderately challenging DIY task. The 2.0L turbo engine in the RDX has direct-injection, and the spark plugs are located under the ignition coils, which are easily accessible on top of the engine.

Steps for DIY:

  1. Gather Tools: You'll need a torque wrench, spark plug socket (typically 14mm thin-wall), socket extensions, ratchet, and a flathead screwdriver or trim removal tool for connectors.
  2. Disconnect Battery: For safety, disconnect the negative battery terminal.
  3. Remove Engine Cover: Unclip and remove the plastic engine cover.
  4. Access Coils: Disconnect the electrical connectors from each ignition coil. Carefully unclip the harness if needed. Remove the bolt holding each ignition coil in place, then pull the coils straight up and out.
  5. Remove Spark Plugs: Use your spark plug socket and extension to carefully remove the old spark plugs. Inspect them for wear, fouling, or oil.
  6. Install New Plugs: Use only genuine Acura or OEM-equivalent (e.g., NGK Iridium) spark plugs. Ensure they are properly gapped (though pre-gapped iridium plugs usually don't need adjustment). Hand-thread them in first to avoid cross-threading, then torque to specification (refer to your owner's manual or a service manual).
  7. Reassemble: Reinstall ignition coils, reconnect electrical connectors, and replace the engine cover. Reconnect the battery.

When to See a Shop:

  • If you're uncomfortable with the process or torquing specifications.
  • If the misfire persists after replacing the spark plugs and clearing the codes.
  • If you suspect an issue with an ignition coil or fuel injector, as further diagnostics (e.g., swapping coils, fuel pressure tests) may be needed. A professional can quickly diagnose and replace a faulty coil.
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