Low vacuum readings

[Mixzzz]

that link takes me to the realOEM homepage so not sure the part you mean

Fixed

[digger]

ive got the other style vacuum system connect direct from booster to post throttle without the other line. dont know what the function of the additional line is. if it a straight Y-piece isnt it just a leak?

[Mixzzz]

ive got the other style vacuum system connect direct from booster to post throttle without the other line. dont know what the function of the additional line is. if it a straight Y-piece isnt it just a leak?

It seems like it is just some kind of bypass and removing didn't change a lot... Also is ICV supposed to be spring loaded? Because my doesn't spring back when closed...

[Julien]

M52b25 injectors are 17.5lb/hr 4 point spray. I know they're larger than stock but ECU adapts easily.

Turns the cause was valve clearances. Today we adjusted them 0.20mm at camshaft side. On some valves the gaps were 0.10mm and smaller - last time we adjusted them when head was on table. Problem solved, the idle is good now on LPG, need to clean injectors for gas to work properly but otherwise it's good. Haven't checked vacuum yet tho

Did the vacuum change?

[zaq123]

ive got the other style vacuum system connect direct from booster to post throttle without the other line. dont know what the function of the additional line is. if it a straight Y-piece isnt it just a leak?

It's not the straight Y, just like reaoem description says - air pump aka jet pump aka venturi pump. Below is a cross section from e39 but e30 one has a similar idea behind it