After days of searching for the culprit, I decided to test the Map(boost) sensor(the one on top of the Y-pipe)... Not sure if I did it correctly, but this is what i did, and results I got...
4 PIN Connector, 1 ground, 2 temp sensor,3 power(5volt), 4 boost..
So i took volt meter, grounded to 1, tested 3(with key on -i got like 4.3 volts,
-next i grounded to 1, positive to pin 4 (set volt meter to 5v)-vacuum pump on boost sensor(still connected to wiring harness-just did pin outs from back of plug)
Readings...(not sure if I'm doing it right), so any help would be greatly appreciated


0 psi-1.58V
5 psi-1.45v
10psi- 1.30v
15 psi- 1.05v
20 psi- .78v
22.5 psi- .66v

These just do not seem right.. any insight?? Or this boost sensor just junk at this point and time to replace.. its the bosch sensor..2001 911 turbo

thanks in advance

 

map sensor is cheap...

 

The map sensor does not read vacuum. use positive psi instead. Reads till about 23psi

 

Positive psi? Can you tell me how to go about testing it.. ?

 

Never checked one. But its a bosch Tmap. I would think your numbers are "good" as they are changing as you add more psi. This may help you.

http://www.bosch.com.au/content/lang...d_Function.pdf