Does not boost past 5 PSI?

2003 SUBARU IMPREZA
104,000 MILES • 4 CYL • AWD • MANUAL
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My vehicle listed above WRX, has an upgraded turbo and fuel system, but lately I can't boost past 5 PSI or it will feel like it is retarded my timing, what do you think could cause this?
Oct 19, 2010 at 6:31 PM
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Have you changed your BOV? If so, your MAF may be making your fuel/air mix to rich. A vented BOV will do that.
Oct 19, 2010 at 6:39 PM