Computer boost gage

**cmal37** · 05-10-2011

I am a proud new owner of a 02 grand prix gtp, i just fixed the lights behind the computer but the boost gage says i have no boost.... ever. Is there a connection somewhere that could be bad? any suggestions are greatly appreciated

**QUICKSILVER462** · 05-11-2011

A good thing to do would be to install a manual boost gauge to double check that you are actually NOT boosting. You can use a vacuum/PSI diagnostic gauge if you have one since it reads vacuum and PSI. You just need a long hose so you can view it from the driver seat while drivng so you can watch the gauge under WOT.
I had a similat problem as you described, I found that the little filter on the end on the BBV solenoid (located in front of BBV vavle) was deterierated and clogged the port it was on. I simply cleaned the end and installed a litttle vacuum 90degree fitting on the end to keep dirt out. Now it boooosssttsssss.

**rynoman03** · 05-11-2011

Check the green wire on the plug for the MAP sensor. IF it is dammaged or loose on the plug it will not register boost.

**brandonl2000** · 05-11-2011

and keep in mind the stock boost gauge only works when you are at a certain speed and certain throttle position. it will not read boost just with regular driving.

i thought the same thing when i got the gtp. then i stepped on it and it went UP UP UP.

also, on the interstate in 4th gear, give it some throttle without changing gears you'll see it then, too.