Carlosfandang0
Autocross Newbie
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 it’s 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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