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Heavy Breather



  GTiR 394bhp


Is it normal for a valver to breathe wuite heavily when the oil cap is off?I cant smel petrol but worried it could be the rings on their way out.
 
  2005 Nissan Navara


it all depends wot u mean by heavy! mine does "a bit" on idle (stops once u pick the revs up), and thats with new rings and honing.

u could do a compression test if ur worried...
 
  172 cup,s2 rs turbo


if it runs/goes ok then dont worry about a bit of vapour out of the filler cap when running. if it evers starts to feel underpowered etc then thats when you worry and look into it.
 


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