What is the value for the sensor supposed to be. The one I have stays at 99 kpa. No changes with stepping on gas pedal

 

That’s about typical for Dallas. That sensor changes reading with altitude. It does not change with throttle position.

 

Does that mean it is good sensor?

 

I would say yes. It’s basically a barometer and it’s reading about what would be expected at Dallas’s altitude of 450’ above sea level. Sea level pressure is 101 kPa and you get 99. I don’t know of any way to actually test it.

It’s job is to tell the ECU whether you’re driving in the mountains or not so it can adjust the fuel/air mixture and timing. When mine failed, it read some impossible value like 15,943 kPa. The engine went to open loop, the CEL came on, and the fuel mileage decreased dramatically because of the impossible value.

 

I am trying to chase down the over boost issue the car is having and from what I have collected so far is a couple of things need to be checked. The MAP sensor which I purchased online and which reflected the typical symptoms of a bad MAP sensor. After replacing the sensor, the car has no power while the old MAP sensor has too much power and hence the over boost. Which one is the good one??? Also the sensor on the top of the intake tube which you told me 100 KPa is normal for Dallas, therefore I am assuming it is good. The waste gate was opening and closing using an air compressor to check. The voltage is OK, but do not know if I was checking it right..
Because of the annoying sound of the over boost, I change shift to 6 gear and then to 5th gear which is the most comfortable if I am driving under 60 miles per hour.
I removed the MAP sensor completely to leave the hole open and relieve some of the backed up air pressure. I can not tell if it is working