97 gtp l67 with Gen v m90 swap not building boost..

[rob99gtp]

I have just preformed a Gen v m90 swap on my l67 I'm not sure why but it's not building boost. Dose anybody have any ideas?

 

[Turbocharged400sbc]

bbv is stuck open or someone blocked off the lower vac port instead of leaving it open to atmosphere or attached to a bbv solenoid

 

[Turbocharged400sbc]

if you have a "ported" LIM dep on the shape at the bbv opening the gen5 evap passage sits over the intake so you could be pushing bost air into the crankcase

 

[buickman104]

My brother in law's ssei just had the same issue when he did a gen 5 swap. The bypass plate in the supercharger was so gunked up with EGR carbon that the actuator wasn't able to close it all the way so he couldn't make boost. Had to take the blower off again and carb clean the coin until it was shinny again.