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2020 Aviator Reserve Rough Idle and Check Engine Light

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Mike T. · rep 0 · May 24, 3:30 PM · 1 replies · solved · Question

Vehicle: 2020 Lincoln Aviator Reserve

Hey everyone,

I'm experiencing a frustrating issue with my 2020 Lincoln Aviator Reserve. Lately, it's developed a noticeable rough idle, especially when I'm stopped at a light or in park. It feels like the engine is slightly shaking, and it's not smooth at all.

To top it off, the Check Engine Light (CEL) came on a couple of days ago and hasn't gone off. The car still drives, but I'm worried about potential long-term damage or getting stranded. There's no significant loss of power that I can tell, but the rough idle is definitely new.

Has anyone else with a 2020 Aviator, or similar Lincoln model, experienced something like this? Any ideas on what might be causing it before I take it to the dealer? Thanks in advance!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 24, 3:30 PM

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Hello John, a rough idle accompanied by a Check Engine Light (CEL) on your 2020 Lincoln Aviator Reserve often points to an issue within the engine's combustion or air/fuel mixture systems. This is a common concern that can stem from several sources and should be addressed promptly to prevent further issues.

Here are the most common causes and diagnostic steps:

  1. Read OBD-II Codes: The first and most crucial step is to use an OBD-II scanner to pull any diagnostic trouble codes (DTCs). Common codes for rough idle and misfires include:

    • P030x (e.g., P0301 for cylinder 1 misfire, P0300 for random/multiple misfires)
    • P0171 or P0174 (System Too Lean Bank 1 or 2), which could indicate a vacuum leak or fuel delivery issue.
    • P0420 or P0430 (Catalyst System Efficiency Below Threshold), which might be a secondary issue caused by prolonged misfires.

  2. Ignition System: Worn spark plugs or failing ignition coils are very common culprits. If you have a misfire code (P030x), it will often point to a specific cylinder. You can inspect the spark plug for that cylinder for fouling or wear, and potentially swap the coil with an adjacent cylinder to see if the misfire moves.

  3. Fuel System: Clogged fuel injectors can lead to a lean condition and misfires. Less commonly, a failing fuel pump or fuel pressure regulator could be the cause, affecting fuel delivery to the engine.

  4. Vacuum Leaks: Unmetered air entering the engine through a cracked vacuum hose, intake manifold gasket, or PCV valve can cause a lean condition and rough idle. A quick visual inspection of vacuum lines is a good starting point.

  5. Sensors: A faulty Mass Airflow (MAF) sensor or Oxygen (O2) sensor can send incorrect data to the engine control unit (ECU), leading to incorrect air/fuel mixture and a rough idle.

When to see a shop: If you don't have an OBD-II scanner, or if the codes point to complex issues like multiple misfires, persistent lean conditions, or internal engine problems, it's best to take your Aviator to a qualified technician. Driving with a persistent misfire can damage your catalytic converter over time, leading to a much more expensive repair. A professional can accurately diagnose the root cause using specialized tools and perform necessary repairs safely.

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