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2020 Eclipse Cross SE - Significant Turbo Lag and Power Loss

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Chris P. · rep 0 · May 25, 4:06 AM · 1 replies · solved · Question

Vehicle: 2020 Mitsubishi Eclipse Cross SE

I've got a 2020 Mitsubishi Eclipse Cross SE with the 1.5L turbo engine, and lately, I've noticed a significant amount of turbo lag, much more than usual. It feels like there's a real delay in power delivery, especially when accelerating from a stop or trying to pass on the highway.

It's not just the lag; the overall power seems reduced. The car just doesn't feel as responsive as it used to. There's no Check Engine Light on yet, but I'm worried something might be wrong with the turbocharger or engine. Has anyone else experienced this with their Eclipse Cross?

✓ Accepted solution

ClearTheCode Admin

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

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ClearTheCode admin answer:

Experiencing increased turbo lag and reduced power in your 2020 Mitsubishi Eclipse Cross SE is a clear indicator that something is affecting your engine's ability to generate boost or deliver power efficiently. Even without a Check Engine Light (CEL), there can be underlying issues.

Common Causes for Turbo Lag/Power Loss:

  1. Boost Leak: Leaks in the intake system (hoses, intercooler, clamps) can cause the turbo to work harder without effectively delivering boost to the engine.
  2. Wastegate Malfunction: The wastegate controls exhaust gas flow to the turbo. If it's stuck open or not closing properly, boost pressure will be low.
  3. Turbocharger Issues: While less common on newer vehicles, a failing turbocharger (worn bearings, damaged compressor/turbine wheels) will result in poor performance. The 1.5L turbo is generally robust, but issues can arise.
  4. Mass Airflow (MAF) Sensor or MAP Sensor Issues: A dirty or faulty MAF or Manifold Absolute Pressure (MAP) sensor can send incorrect air intake readings to the ECU, leading to improper fuel-air mixture and reduced power. This might trigger codes like P0101 (MAF Sensor Range/Performance).
  5. Clogged Catalytic Converter or Exhaust Restriction: A partially clogged catalytic converter or other exhaust restriction can create back pressure, hindering engine performance and turbo spool-up.
  6. Fuel System Problems: Issues with fuel pressure or clogged fuel injectors can also lead to a lack of power.

Diagnostics & What to Do:

  1. Scan for Pending Codes: Even without a CEL, a professional scan tool might reveal pending or history codes, such as P0299 (Turbocharger/Supercharger Underboost) or P0101 (MAF Sensor).
  2. Visual Inspection: Check all visible intake and intercooler hoses for cracks, loose clamps, or damage.
  3. Listen for Unusual Noises: A failing turbo might produce a whining or whistling sound.
  4. Professional Diagnosis: A mechanic can perform a boost pressure test, check MAF/MAP sensor readings with live data, and inspect the turbocharger and exhaust system. They can also check fuel pressure.

When to See a Shop:

  • Promptly: While not immediately critical if there's no CEL, continued driving with reduced power can mask a more serious issue that could lead to further damage. If a CEL does come on, or if you hear any new, unusual noises, get it to a shop immediately. Addressing boost leaks or sensor issues early can prevent more expensive turbo or engine repairs down the line.
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