boost problems

[SkyeTy]

I finally got my truck all together and ready to run again after being out of commision for over 7 months. i took a test drive and was getting barely any boost, full throttle it would creep up to about 5-6 psi. i just installed one of waller's 20g, i replaced all the spark plugs, wires, cap-rotor, pcvs, and seals on just about everything. i disconnected the vacume line to the wastegate, and i got full boost. and it felt really quick. what would cause the wastgate to stay open if it isn't actually making any boost?

 

[The Devils Own Chariot]

Re: boost problems

Huh? Why is the wastegate open when your not making boost?
Maybe you have the boost solenoid hooked up wrong or its bad. Im sure you have tried that all ready. If the turbo is making full boost disconnected from vacuum then start by looking at everthing in the vacuum chain that is connected to the turbo.

 

[SkyeTy]

Re: boost problems

Huh? Why is the wastegate open when your not making boost?
Maybe you have the boost solenoid hooked up wrong or its bad. Im sure you have tried that all ready. If the turbo is making full boost disconnected from vacuum then start by looking at everthing in the vacuum chain that is connected to the turbo.

i checked and it is hooked up right, all the lines are attached properly. i don't understand if the solenoid is bad even, how would it apply pressure to the diaphram if their is no pressure there?

 

[The Devils Own Chariot]

Re: boost problems

Are you taking about the turbo, and why it fully spools without the vacumm hooked up?
When you disconnect the vacuum and you make full boost with the turbo that should mean you're turbo is in working order. I would look out from there. Its possible your wastegate rod needs adjusting. Sorry if Im not understanding.