Boost gauge when key is on?
 

Just seeing what everyone else's boost gauge does when you first turn the key on. Mine just sweeps up to 5 psi and drops back down. Is it supposed to do a full sweep, or is mine not acting right? I just noticed my boost gauge light flickers at idle, and I thought maybe these 2 things had something in common. Thanks for the help.

The partial sweep up and back to zero is normal start-up routine. Don't know what is up with your light flickering, other than you are not the only one to report that issue.

i never paid attention to the sweep on start up, but i have noticed sometimes the back light kinda flickers soemtimes. i havent taken it in yet, still got plenty of time for that, i just added to my list of things for the next trip to a dealer.

Mine flickers too at times, it's going to the dealer Tuesday for that among other things.

Mine sweeps up to zero, then slowly builds pressure. Does anybody have a boost gauge acting weird? Mine has swept to zero, gone down and then back up before on start up.

mine flickers too, im thinking its a bad ground to the BCM

If the sweep is on purpose, they usually only sweep far enough to ensure that they don't get trapped over on the right. 4th gen F-bodies sweep the tach and speedo full range only if the battery has been disconnected. I guess they're assuming it's not likely that the car was turned over while the key was off. Late model Vettes always sweep full range, I guess to impress the drivers.

Ira

the needle jump is normal as the stepper motor in the gage is running a diagnostic to make sure it's operational. I took mine in in 08 for the flicker and they fixed it (by replacing the gage) under warranty and there was a buletin about it, but it started doing i a year later, it's a bad wire I think.

On my boost gauge, it usually sits on the 20 or 30 underneath the zero instead of on the zero while driving, unless I kick it. Is the gauge supposed to be sitting on zero during normal driving ?

No..unpressurized and under low load conditions, the the eng operates in a vacuum ( below zero), as power demands go up it will rise depending on the load and demand. A non turbo'd car will see zero at wide open throttle,and 20-30 at idle and steady no load cruise, zero is equal to atmospheric pressure.