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Engine hissing sound on off.

  • Tonsing
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10 May 2019 07:05 #29480 by Tonsing
Engine hissing sound on off. was created 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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10 May 2019 07:19 #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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10 May 2019 10:39 #29491 by Andy.MacFadyen
Replied by Andy.MacFadyen on topic Engine hissing sound on off.
Brake servo hose ?

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10 May 2019 15:27 - 10 May 2019 15:27 #29501 by chief eaglebear
Replied by chief eaglebear on topic Engine hissing sound on off.
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: 10 May 2019 15:27 by chief eaglebear.

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26 May 2019 17:28 #30130 by John Curtis
Replied by John Curtis on topic Engine hissing sound on off.
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?

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26 May 2019 20:23 #30137 by PDM
Replied by PDM on topic Engine hissing sound on off.
Try with and without the A/C on. It could be the expansion valve

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27 May 2019 01:41 - 27 May 2019 01:42 #30147 by Andy.MacFadyen
Replied by Andy.MacFadyen on topic Engine hissing sound on off.
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

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Last edit: 27 May 2019 01:42 by Andy.MacFadyen.

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27 May 2019 10:32 #30153 by Landroverman1958
Replied by Landroverman1958 on topic Engine hissing sound on off.
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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