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2018 Q50 Red Sport: Whining Noise & Power Loss - Turbo Issues?

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Chris P. · rep 0 · May 22, 5:11 AM · 1 replies · solved · Question

Vehicle: 2018 Infiniti Q50 Red Sport 400

Hey everyone,

I'm reaching out because I've been experiencing some concerning issues with my 2018 Infiniti Q50 Red Sport 400. Lately, I've noticed a distinct, high-pitched whining noise, almost like a supercharger, but it's definitely not that. It's most prominent when I accelerate, especially under load.

Along with this noise, I've felt a significant drop in power. The car just doesn't pull like it used to, and it feels sluggish, particularly at higher RPMs. I haven't seen any warning lights on the dash yet, which is confusing.

Is this a known reliability issue for the VR30DDTT engine in these model years? I'm worried it might be related to the turbos. What should I be looking for, or what are the common culprits for these symptoms? Any advice on next steps would be greatly appreciated.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 5:11 AM

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ClearTheCode admin answer:

It sounds like you're describing classic symptoms that could point to an issue with your turbochargers, which is a known concern for some early VR30DDTT engines, particularly in the 2016-2018 Q50 and Q60 models. The high-pitched whining noise under acceleration, coupled with a noticeable loss of power, strongly suggests a problem within the forced induction system.

Here are the common causes and steps to consider:

  1. Turbocharger Failure: The most common cause for these symptoms is a failing turbocharger. The whining noise can be from worn bearings within the turbo, and the power loss is due to the turbo not being able to produce adequate boost pressure. This can sometimes be accompanied by blue smoke from the exhaust if oil seals are failing.
  2. Boost Leaks: A significant leak in the intercooler piping, charge pipes, or vacuum lines can also cause a loss of boost and potentially a whistling or hissing sound, though less commonly a high-pitched whine. This would lead to the engine struggling to make power.
  3. Wastegate Actuator Issues: Problems with the electronic wastegate actuators can prevent the wastegate from closing properly, leading to a loss of boost pressure and reduced power.
  4. Catalytic Converter Clogging: While less likely to cause a whine, a severely clogged catalytic converter can restrict exhaust flow, leading to power loss and potentially unusual noises.

When to See a Shop:

  • Immediately: Given the potential for turbocharger failure, it's highly recommended to have your vehicle inspected by a qualified Infiniti specialist or a reputable performance shop as soon as possible. Continuing to drive with a failing turbo can lead to more severe engine damage, including metal fragments entering the engine or catastrophic turbo disintegration.
  • Diagnostics: A professional shop will perform a diagnostic scan for any pending or stored OBD-II codes. Common codes related to turbo issues include P0299 (Turbocharger/Supercharger Underboost) or P0234 (Turbocharger/Supercharger Overboost Condition). They will also conduct a boost leak test, inspect the turbochargers for shaft play, and check the wastegate operation. Early diagnosis can prevent more costly repairs down the line.
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