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1984 noise at idle

Engine

Vehicle Information: Year: 1984; Engine (Size, Modifications): 3.2 K27; Total Mileage: 53,000;

My car just developed a noise coming from the turbo side of the engine. It happens during idle or a slow cruise, but when I accelerate it goes away. As the r's come down it returns. The sound is a hissing noise,not a turbo whine. It does not change in volume with acceleration. At first I thought it was a alternator bearing,or ac related, but as I said it does not change. The tune is constant, and really noticeable when you are at a light and there is a van or a large mass vehicle in the next lane to me as the sound echo's. The car runs super and has no other problem's. It is a new k-27, But it has been on the car for a year prior to this problem.

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