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2017 Q50 Red Sport 400 - Turbo Lag and Hesitation Issues

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Rachel A. · rep 0 · May 22, 5:04 AM · 1 replies · solved · Question

Vehicle: 2017 Infiniti Q50 Red Sport 400

My 2017 Q50 Red Sport 400, with about 65k miles, has recently started feeling really sluggish, especially off the line or when trying to accelerate quickly. It feels like there's a significant delay before the turbos spool up, and sometimes it just hesitates before finally kicking in.

It's not consistent, but it's happening more often. I've kept up with all the scheduled maintenance, oil changes, etc. I'm worried it might be something serious with the turbos or the VR30DDTT engine itself. Has anyone else experienced this with their Q50? What should I be looking for?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 5:04 AM

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ClearTheCode admin answer:

Turbo lag and hesitation in the VR30DDTT engine, especially on a 2017 Q50 Red Sport, can stem from several common issues. It's crucial to diagnose this properly to avoid further complications.

  1. Check for Boost Leaks: Inspect all turbocharger hoses, intercooler piping, and connections for any cracks, loose clamps, or damage. Even small leaks can significantly impact boost pressure and cause hesitation.
  2. Wastegate Actuator Issues: The electronic wastegate actuators on the VR30DDTT can sometimes malfunction, leading to improper boost control. This might not always trigger a check engine light immediately but can cause noticeable performance drops. A diagnostic scan might reveal codes like P0299 (Turbocharger/Supercharger Underboost).
  3. Spark Plugs and Ignition Coils: Worn spark plugs or failing ignition coils can lead to misfires and a general feeling of sluggishness, especially under load. While not directly turbo-related, they impact overall engine performance.
  4. Fuel System Pressure: Issues with the high-pressure fuel pump or fuel injectors can lead to insufficient fuel delivery, causing hesitation. A diagnostic scan might show codes like P00C6 (Fuel Rail Pressure Too Low - Engine Cranking) or P0087 (Fuel Rail/System Pressure - Too Low).
  5. MAF Sensor/Air Filter: A dirty or faulty Mass Air Flow (MAF) sensor can send incorrect air readings to the ECU, affecting fuel-air mixture and engine performance. A clogged air filter can also restrict airflow.

When to See a Shop: If you're experiencing consistent hesitation, especially if accompanied by a check engine light or unusual noises, it's best to have a qualified Infiniti technician perform a comprehensive diagnostic. They can use specialized tools to monitor boost pressure, fuel pressure, and other critical engine parameters in real-time to pinpoint the exact cause.

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