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Engine hissing sound on off.

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4 years 10 months ago #29480 by Tonsing
My car i20 gives hissing sound only when off from on.

Cleaned the TB unit, check all fluids level all ok. I checked the pcv valve either in both directions and in one direction it's block and the other it's ok. I also feel a sucking from the pcv hose when block by my fingers. Also shaking the pcv, it's not clogged. All possible options done. Please help. Thanks.

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4 years 10 months ago #29482 by guafa
Replied by guafa on topic Engine hissing sound on off.
Hi tonsing,

Is there any hesitation or idle higher than normal?

Do you have fuel trim numbers?

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4 years 10 months ago #29491 by Andy.MacFadyen
Brake servo hose ?

" We're trying to plug a hole in the universe, what are you doing ?. "
(Walter Bishop Fringe TV show)



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4 years 10 months ago - 4 years 10 months ago #29501 by chief eaglebear
my thought was a little vac leak that is making noise at a particular manifold pressure- maybe take a squirt bottle and do a scanner danner vacuum leak check just a thought as you described the problem happening apon a shutdown
Last edit: 4 years 10 months ago by chief eaglebear.

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4 years 10 months ago #30130 by John Curtis
Are you sure you’re not over heating the engine?
Leaking coolant?
To clarify... this is only happening after the car runs and then is shut off?

Making Pressure Differential Sensors (PDA Sensors) for pressure pulse diagnostics.
Currently servicing Central Texas.

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4 years 10 months ago #30137 by PDM
Replied by PDM on topic Re:Engine hissing sound on off.
Try with and without the A/C on. It could be the expansion valve

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4 years 10 months ago - 4 years 10 months ago #30147 by Andy.MacFadyen
With the engine cover off get an assistant to operate the ignition, try to find what side of the engine the noise is coming from. Then repeat using a short length of garden hose as s stephoscope

" We're trying to plug a hole in the universe, what are you doing ?. "
(Walter Bishop Fringe TV show)



Last edit: 4 years 10 months ago by Andy.MacFadyen.

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4 years 10 months ago #30153 by Landroverman1958
Perhaps a problem with the engine breather system,remove the oil filler cap and see if there is vacuum in the rocker cover,breathers allow vacuum into the crankcase,peugoets prone to it the 3cylinder variety.

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