No Secondary Boost
 

I know this has been covered before and there are sites with troubleshooting guides but I wanted to get some help from the experts.

First things first I have full boost until after transition. Basically my pattern is 10-8-2. So far I've checked all the easy stuff and the things I can without a vacuum pump and pulling off the UIM. All the hoses that I can get to have been checked. I checked the wastegate control/turbo precontrol solenoid hoses. I did find the zip ties holding those hoses on had gotten brittle and weren't doing there jobs, and the turbo precontrol line going into the bottom looked like it was starting to come off. So I fixed that and was hoping that was fix. Nope. I read that the ABV and CRV worked exactly the same so I swapped those to see if maybe the CRV was just constantly venting air and no change.

Here's where I need help. Is there anything else I can check before I buy a vacuum pump and start checking solenoids and check valves. And when I do get the pump where should I start. I'm trying not to pull the UIM, but it looks like that's what's next.

Thanks in advance

If you want to check things first that aren't under the UIM, I'd focus on the CRV, pressure tank and it's check valve.

I recall many yard back I had a similar problem. My charge control actuator didnt to closen basically venting all secondary boost. The hose from LIM had come loose.

You need some check valves pronto. Sent you a PM on that.

Dale

Thanks for the help everyone