hissing when turning over

[rupester93]

When starting the car and it's first turning over, a hissing noise as if pressure is escaping somewhere, any ideas? Can't locate where it is coming from. Haven't heard it while running only first turning over

[narfire]

How are the brakes? Perhaps the diaphragm in the booster has a hole/tear. Mine had a hissing sound when the car was idling.

[bradartigue]

Loose spark plugs.

Is your air cleaner off? Carburetors hiss before the motor catches - it is always muffled by an air cleaner.

[rupester93]

I did just have the spark plugs out so I'll double check them.

[rupester93]

Located the leak, it started doing it all the time and was able to find it, an air hos e as it goes into the block is leaking, will replace it tomorrow.