MAP failure

[Gubien]

Hi!

I'm having some boost issues at the moment and therefore I made a pressure test of my system.

I then discovered via. vagcom that my MAP sensor only read up till 1400 mbar, which I thought was a bit odd, as I had 1bar in the system!

Is this some kind of "safety" **** when the car is not running or is the MAP sensor (Supercharging pressure sender -G31-) defektive?

When logging I get values up to 2400mbar... So...whats up?.. lol

 

[ibizacupra]

you saying you have an external gauge showing 1bar when the map sensor is showing 0.4 when logging yea?

defective sensor

 

[Gubien]

I have a brand new external manometer on the compressor I make the pressure with... when reaching above 0,4 on the manometer, vagcom (with ignition on) shows 1400mbar, above 0,4 bar, it still shows 1400mbar... though I pump like 1,0 bar in, it does not change in vagcom!

Strange thing is though, when I make logs with vagcom, I have logs showing above 1400 mbar

 

[ibizacupra]

manometer on the compressor?
how do you seal the whole intake tract to "just" check the MAP sensor then?
throttle body is open slightly

 

[Gubien]

Not on the compressor itself. Have one similar to this:

http://www.espeloev.dk/video/17052009034.avi

The video can give you an idea of how I did it.
I did not make pressure over the tb, just from before first intercooler, and after the second intercooler