Possible Vacuum leak??

Tony7781

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Joined
Jan 9, 2008
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Staten Island
Hey guys, I have a whistling/hissing sound during acceleration up to around 3000 rpm. It sounds like its coming from somewhere near the firewall. Any advice on the easiest way to try and find the leak? I only get 11.7 mpg, and im pretty sure this is the main cause for that so any help would be greatly appreciated!
 
Outdoors (not in a garage) spray engine cleaner at the places where you think the leak may be. If there is a vacuum leak, the engine sound/speed will change when you hit it with the spray. Staring fluid works better, but it also has a better chance of starting a fire and burning your eye lashes off.
 

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