Tricky-Ricky Posted May 30, 2010 Share Posted May 30, 2010 This is an odd one, i took off my plenum yesterday to paint etc, today it goes back together, all tightened up fine, but with engine running i get a distinct hissing/sucking sound coming from around my catch can and pipework, now the only pipe i removed was the one to the plenum, but after replacing one of them there is still the noise. So i get some soapy water and start to liberally paint the hoses an fittings but no sign of a leak, i pin the noise down to the non return valve that comes from the left hand cam cover, so i remove it and decide to seal up the join between the to different colour plastics, but to no avail, now is this just an odd noise coming from the air passing through the valve or could there be a leak that i cant detect? has anyone had something similar? Quote Link to comment Share on other sites More sharing options...
andlid Posted May 30, 2010 Share Posted May 30, 2010 This is an odd one, i took off my plenum yesterday to paint etc, today it goes back together, all tightened up fine, but with engine running i get a distinct hissing/sucking sound coming from around my catch can and pipework, now the only pipe i removed was the one to the plenum, but after replacing one of them there is still the noise. So i get some soapy water and start to liberally paint the hoses an fittings but no sign of a leak, i pin the noise down to the non return valve that comes from the left hand cam cover, so i remove it and decide to seal up the join between the to different colour plastics, but to no avail, now is this just an odd noise coming from the air passing through the valve or could there be a leak that i cant detect? has anyone had something similar? you sure the gasket you used to put the plenum back is keeping it tight there? might be worth spraying some carb spray around the edges to see if the rpm changes? I used gasket on a tube when I put mine back... make sure you didnt trap something between the plenum and outside... easy to do. Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted May 30, 2010 Author Share Posted May 30, 2010 Should have said, that was the first thing i checked, the noise is definitely coming from the valve, very odd. Quote Link to comment Share on other sites More sharing options...
Husky Posted May 30, 2010 Share Posted May 30, 2010 not the 6 plenum bolts? can sometimes be there, putting your hand over each hole will tell you if it gets sucked in. Quote Link to comment Share on other sites More sharing options...
Zugara Posted May 31, 2010 Share Posted May 31, 2010 Sounds like you might have a crack in the casting there fella............. Quote Link to comment Share on other sites More sharing options...
andlid Posted May 31, 2010 Share Posted May 31, 2010 Who was it that managed to do that again? Don't think so though.... Sounds like you might have a crack in the casting there fella............. Quote Link to comment Share on other sites More sharing options...
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