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2020 Eclipse Cross Turbo Lag and Power Loss

0

Mike T. · rep 0 · May 25, 4:06 AM · 1 replies · solved · Question

Vehicle: 2020 Mitsubishi Eclipse Cross SE

Hi all,

I've got a 2020 Mitsubishi Eclipse Cross SE with the 1.5L turbo engine, and I've noticed a significant increase in turbo lag and a general feeling of power loss lately. It's got about 45,000 miles on it. When I hit the gas, especially from a stop or trying to pass, there's a noticeable delay before the power kicks in, and even then, it doesn't feel as strong as it used to. It's almost like the turbo isn't spooling up properly.

I haven't seen any warning lights on the dash, and the engine sounds normal otherwise. Could this be a clogged air filter, or something more serious with the turbocharger itself? Any ideas on what to check first?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 4:06 AM

0

ClearTheCode admin answer:

Experiencing increased turbo lag and power loss on your 2020 Mitsubishi Eclipse Cross can be frustrating and points to an issue within the engine's air induction or turbocharging system. Even without a check engine light, there are several potential culprits.

Potential Causes:

  1. Air Intake Restriction:
    • Clogged Air Filter: A dirty or clogged engine air filter can severely restrict airflow to the turbocharger, leading to reduced performance and increased lag.
    • Blocked Intake Piping: Debris or damage in the intake ducting can also impede airflow.
  2. Turbocharger System Issues:
    • Wastegate Malfunction: The wastegate controls exhaust flow to the turbo. If it's stuck open or not closing properly, exhaust gases bypass the turbine, reducing boost pressure.
    • Boost Leak: Leaks in the intercooler piping or connections can cause a loss of pressurized air, resulting in reduced power.
    • Faulty Diverter/Bypass Valve: This valve releases excess boost pressure when the throttle closes. If it's stuck open, boost can be lost.
    • Worn Turbocharger: While less common at 45,000 miles, a failing turbocharger (e.g., worn bearings) can lead to inefficient operation.
  3. Sensor Malfunctions:
    • MAF Sensor (Mass Air Flow): A dirty or failing MAF sensor can send incorrect air mass readings to the Engine Control Unit (ECU), leading to improper fuel delivery and boost control.
    • MAP Sensor (Manifold Absolute Pressure): A faulty MAP sensor can inaccurately report boost pressure, causing the ECU to under-boost.
  4. Exhaust System Restriction:
    • Clogged Catalytic Converter: A partially clogged catalytic converter can create excessive backpressure, hindering exhaust flow and turbo spool-up.

Troubleshooting Steps:

  1. Inspect Air Filter: Visually check your engine air filter. If it's dirty, replace it.
  2. Check for Boost Leaks: With the engine off, visually inspect all turbo and intercooler pipes for cracks, loose clamps, or disconnections. You might hear a hiss if there's a leak under boost.
  3. Scan for Pending Codes: Even without a check engine light, a professional scan tool might reveal pending or stored codes related to boost pressure or sensor readings.
  4. Listen for Turbo Sounds: Listen for unusual whining, whistling, or grinding noises from the turbocharger, which could indicate internal wear.

When to See a Shop:

If inspecting the air filter and visible piping doesn't resolve the issue, it's crucial to take your Eclipse Cross to a qualified mechanic. Diagnosing turbo system issues often requires specialized tools and expertise, such as smoke testing for boost leaks, checking wastegate operation, and monitoring live sensor data. Ignoring power loss can lead to decreased fuel economy and potentially more severe engine or turbo damage.

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