janweber91

Grace boost pressure issue

I've got a 2017 Honda Grace with a gasoline engine that's giving me fits. The check engine light is on, and it feels like I'm driving with half the horsepower I used to have! It’s got 137899 km on the clock. I'm also getting a really annoying whistling noise, and sometimes a loud hissing when I try to accelerate. Occasionally, the engine even stalls at idle, and I've noticed my fuel consumption has gone up. Could this be the turbocharger failing? Anyone else experienced something similar?

A 2017 Honda Grace with a gasoline engine is experiencing reduced power, a check engine light, whistling and hissing noises, increased fuel consumption, and occasional stalling. These symptoms suggest a boost pressure issue, potentially caused by a failing turbocharger or a defective boost pressure actuator valve. The recommended solution is to have the vehicle diagnosed by a workshop, which confirmed the issue as a faulty boost pressure actuator valve, leading to its replacement and resolving the problem.

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4 comment(s)

That sounds like a real pain! Has the car been regularly serviced, especially regarding the turbo system? Those symptoms—the loss of power, whistling, and hissing—strongly suggest a boost pressure issue. Have you checked for any obvious leaks in the intake system or around the turbocharger itself? What kind of engine response are you getting? Is it just sluggish, or is it more of a jerky, uneven acceleration?

I get what you are saying, but how can I identify leaks? I am not so experienced. And you are mentioning boost pressure: could the boost pressure actuator valve cause these symptoms?

Okay, so, checking for leaks without proper equipment can be tricky. Given the symptoms and your car's mileage, the boost pressure actuator valve could very well be the culprit. A defective electrical bypass valve is a common cause of boost pressure faults on these engines. Honestly, with those symptoms, it's best to get it diagnosed properly. A workshop will be able to check the entire turbo system. That way you will know if replacing the actuator is the solution or if something else is going on. Does that make sense?

Thanks a bunch for the advice! Took it to a workshop. Turns out it was indeed the boost pressure actuator valve. They replaced it, and the car is running like new again! The whole repair set me back about 250€.

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HONDA

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GRACE