Ok I searched around and couldn't really find anyone having the same issues as I am.
My setup:

D16z6
HF manifold
T25
DSM 450's
FMU
V-AFC

When I get on the car and it peaks and holds 7psi the car throws a MAP CEL, everytime. I have tried numerous check valves and extra MAP sensors. My MAP vacuum is coming from the back of intake manifold. Could this have something to do with this?

Please any help, I really want to get this car running without and CEL's, Limp mode sucks.

 

Check valves are only useful when you put them on correctly Seriously though, maybe you have them on wrong. You also need a teeny tiny vent hole between the MAP and check valve. That will allow basicly any check valve to allow vacuum to suck the valve open, yet close when you get pressure - and bleed off any boost that does get by.

 

ok dont use any check valves remove fmu .... pull fuel on the vafc -40 across then tune thas all you gotta do

 

put the fmu and vafc on ebay and use the money for a real tune... you already have a p28, just get it chipped and find someone that does crome.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by oneludesol &raquo;</TD></TR><TR><TD CLASS="quote">put the fmu and vafc on ebay and use the money for a real tune... you already have a p28, just get it chipped and find someone that does crome.</TD></TR></TABLE>

yeah thats actually the best advice...