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Weird hissing noise under power..
https://www.ausmini.com/forums/viewtopic.php?f=2&t=9874
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Author:  MistyK [ Mon Aug 08, 2005 12:16 am ]
Post subject:  Weird hissing noise under power..

My car has started hissing at me.. It's a sound akin to blowing through a straw.. It gets louder with more power... Anyway, popped the hood and had a listen, it's even there at idle, and still got louder with revs and seemed to be coming from somewhere around the carb, but i couldnt feel any air escaping anywhere.. Im really bad at this kinda diagnostic stuff so hoping someone can help... No loss of performance either so im a bit befuddled on this one!

Author:  MrBob [ Mon Aug 08, 2005 6:42 am ]
Post subject: 

Sounds like a Weber!!

Author:  Lillee [ Mon Aug 08, 2005 10:54 am ]
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Exhaust or intake manifold leak? If so you won't feel leaking of anything...

Author:  minicranks [ Mon Aug 08, 2005 11:00 am ]
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vacuum advance pipe.

Author:  J_A_M [ Mon Aug 08, 2005 11:28 am ]
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hmmm.....sounds like it's sucking air IN. How is your idle?

Author:  Chris [ Mon Aug 08, 2005 11:38 am ]
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Vacuum leak. you can hear the air being sucked in. Get a bottle of water and pour it around where the sound is and you will hear the difference. Then pull that bit off and replace the gasket or fix the pipe. Has the vac pipe from the distributor fallen off or broken?

Author:  68matic [ Mon Aug 08, 2005 3:31 pm ]
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wouja use water? castor oil is less potentially damaging

Author:  MistyK [ Mon Aug 08, 2005 10:23 pm ]
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Hmm.. Ok it shoulda been more obvious but when i went back for another look today it stuck out like a sore thumb... The crankcase ventilation pipe running from the rocker cover to the carb had come off at the carb end, hence the hissssssssssssssss... thanks for all ya help though.. :)

Author:  minicranks [ Tue Aug 09, 2005 6:58 am ]
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glad to hear. caster oil would make a huge mess, water kills the motor, engine start make the revs go up many differetn ways to check but all have the same result.

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