eva_lehmann1
Sonic gasoline engine issue
Summary of the thread
The 2020 Chevrolet Sonic is experiencing intermittent check engine light activation, reduced engine power, poor response, stalling at idle, increased fuel consumption, and a whistling noise that turns into a hissing sound during acceleration. These symptoms suggest a potential issue with the turbocharger or a pressure sensor malfunction. Possible causes include a boost leak, faulty intercooler pipes, or a malfunctioning wastegate. Suggested solutions include inspecting the intercooler pipes, checking the MAP sensor, and considering a professional smoke test to accurately diagnose the problem.
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4 comment(s)
eva_lehmann1 (community.author)
Regarding the wastegate, is there a straightforward method to assess its functionality without specialized equipment? Also, if the intercooler piping appears intact, what would be the next logical step in diagnosing a potential leak within the boost pressure system?
louiswolf21
Well, without proper tools, checking the wastegate is tricky. You could try visually inspecting the actuator arm for movement when someone revs the engine, but that's not super reliable. If the intercooler pipes look good, the leak could be coming from the turbo itself or even a faulty boost control solenoid. Honestly, it might be worth getting a professional to smoke test the system to pinpoint the exact location. Better safe than sorry and cause more damage!
eva_lehmann1 (community.author)
I appreciate the additional information and the cautionary advice. Given the potential complexity and the possibility of causing further damage, I will schedule an appointment with a qualified mechanic to diagnose and repair the boost pressure system. Initial estimates suggest a wastegate valve defect, with a projected repair cost of 860€. Thank you again for your input.
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CHEVROLET
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SONIC
louiswolf21
Hey, that sounds rough! A whistling/hissing noise definitely points towards a boost leak somewhere. Have you checked the intercooler pipes for any cracks or loose connections? And maybe give the MAP sensor a look-see, make sure it's clean and the wiring is solid? Could also be turbo lag if the wastegate is sticking a bit, but I'm just guessing.