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The Ford Transit is known for facing issues with the boost hoses in its turbo model, which can lead to an oil leak and a hissing sound. Warning signs of a leaking turbo system include power loss or sporadic misfires. Sometimes, you may hear the boost pressure escaping. However, if the wastegate or bypass valves are leaking, there might not be any noticeable noise. When the wastegate fails to release pressure consistently, it can cause rapid fluctuations in turbo boost pressure. If you suspect a boost leak, avoid accelerating the vehicle to prevent the engine from running too rich, potentially damaging the spark plugs and other components.
The Ford Transit is known to experience issues with the boost hoses linked to the turbo in this specific model. These problems may lead to both oil leaks and audible hissing sounds.