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2020 Eclipse Cross turbo lag and reduced power

0

Mike T. · rep 0 · May 22, 5:33 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 lately, it feels like it's lost some of its pep. I'm noticing significant turbo lag, especially when accelerating from a stop or trying to pass on the highway. It just doesn't seem to have the same power it used to.

There's no Check Engine Light on, and I've kept up with all my regular maintenance, including oil changes. The car has about 45,000 miles. Could this be a problem with the turbocharger itself, or something else in the engine management system?

It's frustrating because the car used to feel much more responsive. Any ideas on what might be causing this or what I should check?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 5:33 AM

0

ClearTheCode admin answer:

Reduced power and increased turbo lag on a turbocharged engine like your 2020 Eclipse Cross can be caused by several factors, even without an active Check Engine Light. The 1.5L MIVEC turbo engine relies on precise air, fuel, and spark delivery.

Here are common culprits:

  1. Boost Leak:

    • Cause: A crack or loose connection in the intercooler piping, turbocharger hoses, or intake manifold can cause boost pressure to escape, leading to reduced power and lag.
    • Action: Visually inspect all accessible turbo and intake hoses for cracks, tears, or loose clamps. A smoke test performed by a shop can pinpoint hard-to-find leaks.

  2. Wastegate Actuator/Bypass Valve Issues:

    • Cause: The wastegate controls exhaust flow to the turbo, and the bypass valve (or blow-off valve) releases excess boost. If either of these components is stuck open or malfunctioning, boost pressure won't build correctly.
    • Action: These components are typically electronically controlled. A diagnostic scan might reveal codes related to boost pressure regulation, even if the CEL isn't on yet.

  3. Clogged Air Filter or Mass Air Flow (MAF) Sensor:

    • Cause: A dirty air filter restricts airflow, and a contaminated MAF sensor can send incorrect air intake readings to the engine control unit (ECU), leading to improper fuel-air mixture.
    • Action: Check and replace your air filter if it's dirty. You can try carefully cleaning the MAF sensor with specialized MAF cleaner, but be gentle.

  4. Fuel System Issues:

    • Cause: A weak fuel pump, clogged fuel filter, or dirty fuel injectors can lead to insufficient fuel delivery, especially under load when the turbo is trying to build boost.
    • Action: This would require professional diagnosis, including fuel pressure tests.

When to see a shop: Since there's no CEL, a professional diagnostic scan using a capable scanner can check for pending codes, live data (like boost pressure, MAF readings), and sensor values that might indicate the problem. It's best to have a mechanic specializing in turbocharged engines or a Mitsubishi dealership investigate to prevent potential damage to the turbo or engine.

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