Thread: 04 no boost?

car is an 04 gtp comp g with 70k on it, completely stock.

So I noticed the boost guage isn't showing any boost. I used my bluetooth scanner and it doesn't show any boost either. It shows vaccuum, and max Manifold pressure it shows is 96KPA which is just short of 1 atmosphere.

The supercharger doesn't make any odd noises.

I was first thinking broken factory boost guage or line leading to it, hence why I got out the bluetooth scanner, but the MAP reading coming up short tells me I'm not getting any boost... right?

any thoughts?

well that sucks
Did you already check vac lines?
Try this TexasTanker had a problem not to long ago. http://www.grandprixforums.net/low-b...rns-71622.html

I think I figured out my problem. But still need help. When I checked the vac line that runs to the MAP, I noticed on the bracket, there is another sensor there that looks like another MAP!? they're both identical with identical wire harnesses plugged into them but different color wires, and one has the vac line connected, the other has a male connected for the vac line, but no line... wtf?

figured it out, the 2nd sensor on the back is the barometric pressure sensor... pretty much a sensor to measure atmospheric pressure for comparison sake to the manifold pressure.

the idiot to had this car before me put the vac lines on wrong, connecting the map to the spot above the supercharger... oops