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2019 Equinox 1.5L Turbo Stalling at Idle and Misfires

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Mike T. · rep 0 · May 25, 1:39 AM · 1 replies · solved · Question

Vehicle: 2019 Chevrolet Equinox LT 1.5L Turbo

My 2019 Chevrolet Equinox LT with the 1.5L turbo engine has been acting up lately. It has about 70,000 miles on it. The main problem is that it keeps stalling, especially when I'm stopped at a light or just idling in traffic. Sometimes, it struggles to restart right away.

I've also noticed a rough idle, and the Check Engine Light has come on a few times, sometimes flashing. When it flashes, the engine feels like it's misfiring pretty badly, and there's a noticeable loss of power. I'm worried about driving it like this. Any ideas what could be going on?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 1:39 AM

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ClearTheCode admin answer:

Stalling and misfires in a 2019 Chevrolet Equinox 1.5L turbo can stem from several common issues. The flashing Check Engine Light (CEL) indicates a severe misfire that could be damaging the catalytic converter, so it's important to address this promptly.

Common Causes:

  1. Ignition System Components: Worn spark plugs, failing ignition coils, or damaged spark plug wires (though less common on newer engines) are frequent culprits for misfires. The 1.5L turbo can be sensitive to spark plug condition.
  2. Fuel System Issues: Clogged fuel injectors, a failing fuel pump, or a restricted fuel filter can lead to insufficient fuel delivery, causing misfires and stalling.
  3. PCV Valve Failure/Oil Consumption: The 1.5L turbo engine, like some other GM small displacement turbos, can experience issues with the PCV (Positive Crankcase Ventilation) system, leading to excessive oil consumption and carbon buildup on intake valves, which can cause misfires and rough running.
  4. Vacuum Leaks: Leaks in the intake manifold or vacuum lines can introduce unmetered air, causing a lean condition and misfires.
  5. Sensor Malfunctions: A faulty Mass Air Flow (MAF) sensor, Oxygen (O2) sensor, or Crankshaft Position Sensor can send incorrect data to the Engine Control Module (ECM), leading to poor engine performance and stalling.

Diagnostic Steps & Potential Fixes:

  1. Retrieve OBD-II Codes: Use an OBD-II scanner to read any stored codes. Common codes for these symptoms include:
    • P030x (P0301, P0302, etc.): Misfire detected in cylinder x.
    • P0171: System too lean (Bank 1).
    • P0420: Catalyst System Efficiency Below Threshold (often a secondary code if misfires are prolonged).
  2. Inspect Spark Plugs and Coils: These are relatively easy to check and replace if faulty.
  3. Check for Vacuum Leaks: Listen for hissing sounds or use a smoke machine to detect leaks.
  4. Professional Diagnosis: Due to the complexity of the turbo engine and potential for multiple issues, a professional diagnosis is recommended.

When to See a Shop:

  • Immediately: A flashing CEL means you should reduce driving and get the car to a mechanic as soon as possible to prevent catalytic converter damage. Stalling can also be a safety hazard. Explain all symptoms and provide any OBD-II codes you've retrieved.
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