Re: Help-Weird compression (air) noise when starting...
Originally Posted by Scottina06
sounds like a vacuum leak to me....maybe in the brake booster line nor another vacuum hose.
Open the hood and have someone else start the vehicle and see if you can narrow down the area it is coming from....
If when you turn off the jeep and you hear a hissing sound after for a second you have a vacuum leak. its the air escaping out of the leak. Any time you have a vacuum leak an easy way to tell where it is take carb cleaner and spray it around the engine bay if you hear the engine rev you have a leak in that area to narrow down the spot. it could be something as somple a a cap fell of from a port or ive seen brake boosters go on cars cuz thats all vacuum related too
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