boost gauge goes crazy?

[black97spyder]

Obviously I have a boost leak somewhere or my gauge is bad (I hope not). My boost gauge is fine under vaccum but once I get under 7psi of boost or more it wobble +/- 3 or 4 psi crazy fast (like so fast its blurry).

Does this sound like a boost leak at the back of the gauge, along the boost gauge line, or at the "p" port on the throttle body??

Or should I inspect and tighten the i/c couplers first, before testing the gauge and line during a BLT?

ive never seen a coupler leaking cause these symptoms before so my guess would be somewhere along the boost gauge line or at the gauge itself, but would like other peoples opinion on what they think.

 

[Dude McGee]

Sunds like a malfunctioning gauge or the line leading to it is cut or loose somewhere. An IC coupler is too far downstream to male fast changes. You know what that means, BLT with the soapy water spray bottle

 

[black97spyder]

Thats what I was afraid of. I kinda thought that the line might have rubbed somewhere in the engine bay and created a little cut or rub mark... this sucks

I dont want to take stuff apart just yet but wanted to know where others would check first

 

[talon3394]

if possible try another gauge, or run a new vacuum line.

 

[zachwilliams02]

Is it a mechanical or electronic gauge. I've never heard of a mechanical gauge doing that