Help Please -- Vacuum / Boost Spike

[NYCZMP3]

I have been noticing on my vac/boost gauge that during acceleration the vacuum isn't climbing as consistent as usual, it will spike from 19 right up to 10, then will pull steadily all the way up to 15 lbs of boost which is my max setting. Don't feel any boost spike just only on light acceleration right before boost I notice this, will not go WOT as I am not sure where the issue is, I checked all vacuum lines and intercooler pipe couplers - no leaks found.

Can anyone help out with some input

 

[mazdaspeedp]

maybe your wastegate is getting stuck closed. Have you ever replaced it? You can get a nice cheap replacment from atp turbo . com

 

[NYCZMP3]

Any way to test the one I have?...

 

[hornsfan10609]

Pull off the vac line running to it and blow in it, if it holds pressure it is fine if air passes through it is leaking. Boost spiking is from the WG sticking closed, not a symptom of a torn WG diaphragm.