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I have a 1992 5.0 with the on3performance kit on it.I just got it running the other day and I took it on a test drive and it took a long time to make boost like around 4500 (not 100% sure about where but later then it should) and i only made 2psi, but to me it sounded like my wastegate was open the whole time which would make sense why, but how could i test this?
 

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Do you have a boost controller if so turn it up to nsee if boost increases. You should hear the wastegate open up.

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don't do that as you can overspin the turbo

do the basics first like double checking your cold side connections, lines to the gate, and even take apart your wg and see if the valve moves as its probabaly stock
 
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