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2017 MKX 2.7L EcoBoost - Low Power and Whistling Noise

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Emily N. · rep 0 · May 22, 8:18 AM · 1 replies · solved · Question

Vehicle: 2017 Lincoln MKX Reserve

Hey everyone,

I've been experiencing some concerning issues with my 2017 Lincoln MKX Reserve, which has the 2.7L EcoBoost engine. Lately, I've noticed a significant drop in power, especially when accelerating onto the highway or trying to pass. It feels sluggish and just doesn't have the usual punch.

Along with the power loss, there's a distinct whistling or whooshing sound coming from the engine bay, particularly under acceleration. It's not a belt squeal, more like air escaping or a turbine sound that's off. The check engine light also came on a few days ago, but I haven't had a chance to get the codes read yet.

Has anyone else with a 2.7L EcoBoost MKX or similar Lincoln model experienced this? Could it be a turbo issue, a boost leak, or something else entirely? Any advice on what to check first would be greatly appreciated before I take it to the dealer.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 8:18 AM

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ClearTheCode admin answer:

It sounds like your 2017 Lincoln MKX 2.7L EcoBoost is experiencing symptoms commonly associated with a turbocharger or boost system issue. The whistling noise, combined with a loss of power and a Check Engine Light (CEL), strongly points in this direction. Here's what you should consider:

  1. Get the OBD Codes Read Immediately: This is your first and most crucial step. A common code for these symptoms is P0299 (Turbo/Super Charger Underboost). Other related codes might include P0234 (Overboost Condition) or codes related to specific turbocharger components like wastegate actuators.

  2. Common Causes for Underboost/Whistling:

    • Boost Leaks: This is very common. Check all intercooler pipes, charge pipes, and vacuum lines for cracks, loose connections, or tears. A whistling sound often indicates air escaping under pressure.
    • Wastegate Actuator Failure: The wastegate controls exhaust flow to the turbo. If the actuator (often electronic on these models) fails or gets stuck open, boost pressure won't build correctly, leading to power loss and potentially a whistling sound as the turbo tries to compensate.
    • Turbocharger Failure: While less common than leaks or actuator issues, internal turbocharger damage (e.g., worn bearings, damaged turbine blades) can cause whistling noises and a significant reduction in boost. You might also notice excessive oil consumption or smoke from the exhaust.
    • Diverter Valve Issues: The diverter valve releases excess boost pressure. If it's faulty or stuck open, it can lead to boost loss.

  3. When to See a Shop: Given the CEL and the potential for complex turbo system diagnostics, it's highly recommended to have your MKX inspected by a qualified technician. They have specialized tools to perform boost leak tests, monitor live data from the turbochargers, and accurately diagnose the root cause. Continuing to drive with a significant boost issue can potentially lead to further engine damage or reduced fuel economy. Address this promptly to prevent more costly repairs down the line.

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