Bad Mileage And Weird Whoosh Sound
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Northstar Engines and System Technical Discussion Discussion, Bad Mileage And Weird Whoosh Sound in Cadillac Engine Technical Discussion; Hey guys I got a question. I posted the whoosh question in the deville forum but only got 1 response. ...
  1. #1
    99Classillac's Avatar
    99Classillac is offline Cadillac Owners Enthusiast
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    Bad Mileage And Weird Whoosh Sound

    Hey guys I got a question. I posted the whoosh question in the deville forum but only got 1 response. Ok I have a 99 Deville. I have replaced the air filter, the sparks plugs(AC Delco), the plug wires, and to no avail. I only get 17-18 mpg on the highway and 9-10 mpg in the city. It sucks! It used to get 25mpg 6 months ago. What else do I need to do to get the mpg up? The engine runs fine and is still quiet and powerful. I haven't noticed any change in engine performance or anything. Also, when I do a WOT, I hear a whoosh sound. The whoosh only comes when the trans shifts from 1st to 2nd. It happens between gears and it happens only when I let my foot off gas in between the gears. If I continually hold the gas, I really can't hear the whoosh. But it sounds a lot like a turbo wastegate opening up and lettin off excess pressure. I had a car with a turbo and it sounded just like it. I know my N* has no turbo. What is that sound? Any help would be appreciated.

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  3. #2
    dkozloski's Avatar
    dkozloski is online now Cadillac Owners 10000+ Posts
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    Re: Bad Mileage And Weird Whoosh Sound

    Plugged exhaust system. Maybe you backed into a snowbank and kinked the pipe. Maybe the cat fell apart and pieces lodged downstream. This would also explain bad gas milage.
    Don't mess with Binky Bear!


  4. #3
    dkozloski's Avatar
    dkozloski is online now Cadillac Owners 10000+ Posts
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    Re: Bad Mileage And Weird Whoosh Sound

    ^^^^
    Don't mess with Binky Bear!


  5. #4
    99Classillac's Avatar
    99Classillac is offline Cadillac Owners Enthusiast
    Automobile(s): Ex-99 Deville owner, Now-04 DTS and 05 DTS. ZX6R Pilot too.
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    Re: Bad Mileage And Weird Whoosh Sound

    thanx! now i have an excuse to tell the wife on why i need a new exhaust system!

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