Hey guys! it's been a long time seen i've been on the forums - life, kids, etc.. i won't bore you with the details.

This just started to happen in the last few months, can't say exactly when since the truck has become my weekend warrior and i don't go wide open very often. I'm losing all boost at WOT and running super rich, it just bogs down. I used to get 7-8 psi at WOT and the truck would pull hard through all gears. Now at partial throttle 50-70% I get around 3-4 psi, but as soon mash the pedal boost drops to 0, FPR goes to 10.0 or lower (bottoms out at 10) and the truck completely bogs down. Happens every time i go WOT from a complete stop or rolling/cruising. I've had the same tune for 5+ years, haven't changed anything. Everything was working cherry up until a few months ago. I replaced the bypass actuator thinking i was loosing boost for that, but no change after replacement. I replaced the belt as well thinking it was belt slip, but same issue after new belt installed.

i doubt its the tune since it's been the same for over 5 years and worked perfectly until recently. i'm thinking something mechanical, i just can't pinpoint it. Any ideas? any help would be appreciated.

 

Giant boost leak. Probably a popped off coupler. Cap off the compressor inlet and pressurize the system with an air compressor if there's nothing obvious visually.

 

thanks for the reply. i need to do a leak test.

but, if it was a big leak why would i make 3-4 psi boost at half throttle and then drop to 0psi at WOT? wouldn't a leak always leak, not just at very high PSI?