ive got a 2003 1.8t ive noticed that at around 5 psi it tends to bounce down to 3 and up to maybe 7, but only when its around 5 anything lower or higher its fine. its not a boost leak because it would be happening at all levels. anyone know of anything like that?
your n75 could be going bad or diverter valve. could be a boost leak to. if you have an boost gauge make sure it is not leaking. you should be peaking around 12psi. maybe you are in limp mode.
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Boost leak?
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