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Hissing Sound When After Turbo kicks in.. 700 1988

posted by  someone claiming to be Dave L on  Sun Jul 15 19:30 CST 2001 [RELATED]

On my 1988 740 Turbo sedan, I just started noticing a hissing sound (similar to a truck releasing the air brake) each time the turbo kicks in and I release the throttle. The performance seems unaffected. Is something loose..It's an automatic if that matters. Doesn't seem like anything too out of the ordinary.. Thanks..





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