Thread: 99 GTP dic shows no boost

I just bought this car. It has no trouble codes, and feels like the supercharger is working, the car really moves. Should I be able to hear the supercharger? I can hear it turning under the hood at idle.

I checked for vacuum leaks, and fittings. I used carb cleaner on the lines also, but it revealed nothing.

Any Ideas?

Thanks a lot!

Originally Posted by Bio248

you boost bypass valve might be dead. remove the vacuum L from the solenoid (black box on the lower drivers side, front of the blower) and plug it. take a run in the car and see if it shows up on the DIC.

I pulled the vacuum line from the small soleniod under the black round canister with vacuum lines going to it. I plugged the left side (hard hose), no joy. I plugged the line on the right side of that solenoid that goes to the canister above. No Joy. Did I plug the correct line? I see the lights for boost on start up on the dic, so I dic is ok.

Is the supercharger audible while driving? Ive been around some supercharged GTO's, and you can hear it easily.

Thanks!

Nothing done recently. I bought it from a gal whose hubby passed away a year ago. She did drive it weekly to excersize it, so it wouldnt rott sitting. It seems by the service records I got with it, that the car was meticulously maintained. It runs awesome.

I used carb cleaner while the engine was at idle on all of the vacuum lines I could find.

Thanks!

Thanks! That did it. It moved, but not far enough. WD40 ftw! I can hear and feel the charger now!! WOW!

Thanks a lot!

Going to have to line it up next to my GTO now.

GTO will kill it, its 380rwhp......but the gtp is for the wife,so i win either way.

GTP has 104000 miles.