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Old 03-20-2018, 02:45 PM   #1
Carlosfandango
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Hissing cylinder!

Hi, What would cause a hissing noise (think small nail in tyre) in cylinder #4 only? It can be heard with the plug removed but also a little with the plug still in place, my guess is crank pressure entering past the piston rings/oil ring, I have had a bit of oil fouling on the plug in this cylinder which was the reason I had a new head fitted but itís back again (the noise is new though), it makes the noise for about 5-10 minutes after switching off the engine, any thoughts?? Thanks.


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Old 03-20-2018, 03:09 PM   #2
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Auxiliary coolant pump??
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Old 03-20-2018, 03:45 PM   #3
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Auxiliary coolant pump??


Donít think it would be that as the sound is (Iím 99% sure) emanating from the spark plug hole! Itís a Sort of Psst Pssst Psssssss Pssst Psss Psssss Psssst noise if thatís at all understandable? With other longer hissing in between.


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Old 03-21-2018, 11:36 AM   #4
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Quote:
Originally Posted by Carlosfandango View Post
Donít think it would be that as the sound is (Iím 99% sure) emanating from the spark plug hole! Itís a Sort of Psst Pssst Psssssss Pssst Psss Psssss Psssst noise if thatís at all understandable? With other longer hissing in between.


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Pcv valve- the little hole on the right side when looking at it. Try placing your finger over the little hole to see if any change. If so, just replace the pcv.
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Old 03-21-2018, 12:06 PM   #5
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Pcv valve- the little hole on the right side when looking at it. Try placing your finger over the little hole to see if any change. If so, just replace the pcv.
It's a noise he can hear coming out of the cylinder with the engine off and the spark plug removed
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Old 03-21-2018, 12:22 PM   #6
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It's a noise he can hear coming out of the cylinder with the engine off and the spark plug removed
Yea, that's exactly what I'm talking about too. The crank case pressure will
still try to escape, possibly past the rings out the top (spark plug hole) or through the pcv valve (if stuck).
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Old 03-21-2018, 01:28 PM   #7
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Yea, that's exactly what I'm talking about too. The crank case pressure will
still try to escape, possibly past the rings out the top (spark plug hole) or through the pcv valve (if stuck).
Good point thanks for the info makes sense. I just remembered diagnosing bad PCV on my car when it was running and I could feel it sucking a ton of air through the pin hole to the right of the diaphragm cap.
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Old 03-21-2018, 03:26 PM   #8
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I checked the PCV myself recently and all seems good, I had an oil change today and they also checked the PCV and said itís good, the noise Iím hearing is only coming from cylinder #4, the other three donít do it, using google I canít find any info on an issue like this! Presumably itís crank pressure passing the rings? But as stated by one of you guys earlier the PCV should control the pressure, could it be the injector maybe??? Removing the oil filler or coolant cap doesnít alter or stop the noise either?????


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