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Low vacuum
- Thread starter FlexLeon
- Start date
Vacuum is the same and when i drive a car and lift my leg of trotlle. I see some 1.8T engines and vacuum is around 5.5 - 6 psi.
Shouldn't be any psi there. -20 ain't it? Something not right there. Unless boost gauge just is faulty.
Low vacuum = air leak. Normal vacuum at idle should be in the -0.8 bar range.
Possible places where air leaks:
- thin hose from manifold to top of DV;
- thin hoses below manifold to N249;
- crankcase breather to PCV valve;
- hose from PCV valve to top of cam cover;
- Y-shaped hose at cam cover (OEM model splits easily);
Other hoses where air can leak (for example the S-shaped hose behind the right front wheel, which links the metal charge pipe with intercooler pipe) are before the intercooler and the leak is usually detected at high boost, by low boost indication on the gauge and hissing, so it's not the case.
~Nautilus
Possible places where air leaks:
- thin hose from manifold to top of DV;
- thin hoses below manifold to N249;
- crankcase breather to PCV valve;
- hose from PCV valve to top of cam cover;
- Y-shaped hose at cam cover (OEM model splits easily);
Other hoses where air can leak (for example the S-shaped hose behind the right front wheel, which links the metal charge pipe with intercooler pipe) are before the intercooler and the leak is usually detected at high boost, by low boost indication on the gauge and hissing, so it's not the case.
~Nautilus
I checked all vacum and turbo hoses and there is not any leak, I tried with 3 bosch DV only with one my car have ok vacume, but I'm confused on my friends 1.8T all of those 3 DV vork just fine.
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