Thread: New gtp and no boost

Ok so I just hooked up a boost gauge and it shows no boost it shows vacuum but then went u throttle it it comes up to 0 and nothing on boost . I checked all the vac lines and all seem good. The thing is my bypass valve is sticky I took the vac actuator off and the lil part that attaches to the butterfly plate for the bypass seems gunked up cause it's stiff to move like it's all oily, it don't move like the one on my spare supercharger. Any tips where to look or could it be that valve

I hooked right before the map sensor that's were that hose goes right?? I thought the map senor is responsible for the vacuum and boost.

no as said before to get a correct reading t in under the snout of supercharger.

Well ****!! Ok guess I'll have to change it. Just seen that the line under the snout was running to the map sensor or at least I thought it was. If it is why wouldnt that work? Just figured that was what tells the ECM boost/vacuum

The line from under the snout does run to the map sensor. Put a tee in that line and it should work.

That's the line I taped in to and then 15 min ago I went and swapped it to the one under the snout. And it does the same thing it should 30 vac and then rev it up and it just goes to 0 and shows no boost. Plus I looked for it on the aeroforce and if shows manifold psi -9 at idle but the thing I don't get is the aeroforce don't match the boost

Well that is Wht the boost gauge shows it goes down at firsts then comes up like normal but never shows boost. But I just got the aeroforce and had it on manifold press and it showed -9 I'm lost now unless I am on the wrong on the aeroforce So I take it having it on the line right before the map sensor was right?? But I still moved it to the T under the snout and is doing the same thing. If there is a leak shouldn't It not show that much vacuum

If you have an extra bbv on your spare supercharged try to swap it to see if there is a difference. Does the aeroforce or your DIC show any boost?

Yea!!! Lol I just put a green coupler
In and have just put new dayco belts. I haven't had the car long but I don't have another vac actuator but I was pushing the valve closed by hand and watching the gauge and had a lil change but never hit boost even when throttling out I just don't get it!!! >:-/

So if you drive it does the car get into boost at all? Does the DIC show full boost at full throttle.

I haven't put it on the road I was just doing this with it running in the shop as I was putting these things in. Plus I totally forgot about the dic I will have to look tomorrow and Whts this mean if it does show some

I might be wrong on this but I'm not sure the car will make boost if it's just in park.

Well I will update later tomorrow. Thanks for all the help. Well Idk if I would call it help. Thanks for confusing me I should say :-)

Ok I took it on the road and it wasnt making boost at wot it showed 2 bars flashing in and out on the dic. Before I changed the coupler I messed with the bypass boost valve off the supercharger cause it was stuck like it was gummed up. Well from looking at my other supercharger I have it was stuck closed. So I freed it up and that is where I had the prob was but idk why it wouldn't close?