Hi folks,

I recently noticed that with the engine OFF, the VDO boost gauge is reading "6 Hg" - I believe it's supposed to read "0", correct? I.e. - neither in boost nor vacuum.

When driving and off throttle, I noticed that I am now getting 28 Hg when I believe it used to be around 23 or 24 Hg off throttle. Boost-wise, I am also down.

Since I don't have a CEL (Check Engine Light), I was thinking that the VDO gauge has run it's course? But I didn't think boost/vacuum gauges break? I.e. - that they are pretty bullet proof?

Any thoughts? Thanks in advance.

 

Yeah the fact that the gauge reads wrong when the car is off is suspect. If it were a boost/vac leak you'd still be showing 0psi with the motor off. Is your gauge adjustable?

 

suspecting the guage as well.... might pick up a new one just in case.... i know they make a "serviceable" guage... but they are fairly expensive iirc

 

How do I know if it's adjustable? It's a standard round VDO gauge with 25 max boost and 30 in Hg vacuum similar to this:

http://www.bobsgauges.com/servlet/th...e-Gauge/Detail

 

I have a VDO 25psi/30in hg gauge and I can tell you that its not adjustable, I was just thinking out loud lol. You might try calling them and seeing if you can get it replaced?

 

Can you feel a lack of power from a decrease in boost? Or does it pull the same even though the gauge reads lower?

 

Seems the same. But you can't really tell for certain since it's nice and cold out. And the turbos prefer the cold.... I'm going to take out the gauge and see if there's anything I can "adjust" on it...

 

Funny, I just noticed this morning that my VDO gauge is reading about 4in. hg. when the car is turned off instead of 0psi...

 

My VDO needle sits slightly lower than zero when off too.