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[calibrated]

My x30xe produces hissing sound under the plenum..e.g. sucking air on O rings...when i push manifold on top the hissing sound dissapear...i tried to put Reinzosil silicone gasket on O rings but no help...did someone experienced something like this? What is the solution?

[zirk]

Should be a nice tight fit, is the Penlium mounted on properly.

[Andy H]

Is it the top hat seal as discussed in this thread?

http://www.omegaowners.com/forum/index.php?topic=138091.0

[calibrated]

Im talking about 6 black "O" rings that come here

[JamesV6CDX]

Plenum off, reseal with a smear of grease on the rings. Failing that, replace

[Andy H]

Something doesn't ring true here - either the manifold has become distorted or something is stopping the two faces from coming together.

Are you sure that the air leak is between the upper and lower manifold? Another possibility is that the air leak is above or below the plastic sandwich plate.

[calibrated]

I,m 90 percent sure...because i hear hissing sound between top manifold and lower manifold pipes...however i have redone rings again with silicone sealant and will see...it sounds stupid to me either but the situation is like that...even the O rings look perfect..they dont have signs of wear...if that doesent help i will look further down the manifold

[Andy H]

There are two dowel pins in the lower manifold that locate in holes in the upper manifold. If they were damaged (or something was stuck in the holes) that might stop the two faces coming together

[Sir Tigger KC]

Mine does this when cold, but the noise goes when it's warmed up and everything has expanded.  I've tried all sorts over the years mostly involving grease and silicone, and  because I'm tight probably the only thing I haven't tried is replacing the 6 big O rings. 

[calibrated]

@Andy i know what you re talking about...ill take a look if this try fails

@Sir same thing like me except i hear hissing also when its warmed up but little les because revs drop...ill report back if i solve this

[calibrated]

i put alot of silicone and still no joy lool....will try to put new O rings....

and by the way guys...is there difference in x25 and x30 ecu except in the eeprom map? i really cant get hold of x30 ecu but can buy x25 one...so if they're same except for the eeprom map i will buy x25 one and put x30 chip?