I was thinking about this today while I was going through some post. When I installed my turbo kit I hooked up the MAP sensor I had purchased to use with the reflash when I got it. I went to the dealership were my dad works and we hooked the computer up to it to clear see what the code was before we flashed it. I drove it there and everything reminded that I had the boost below 1psi and I had a check engine light. The computer showed everything was in good condition and the cel was from a fualty iat sensor it showed a extremely cold temperature on the computer. But going through all the post I noticed everybody said not to run the new MAP sensor until the reflash was done. So does this mean the MAP sensor I bought is in fact not a 2 bar if I drove the car there no problem? There was a thread awhile back talking about the sensor and the price I found it for. I ended up just holding off on the reflash since I left for the summer the next day (I am still away) until I get a new iat sensor. But I am curious if that is a giveaway that the sensor will not work with the reflash or if its even a 2 bar. What are your thoughts?
~Boost. Its what's for dinner!~
Heres the part number:
ACD#213-1520
GM#12569241
~Boost. Its what's for dinner!~
Tim,
The MAP sensor delivers a signal which is between 0 and 5V no matter what pressure range it is used in. Since the 2 BAR sensor has to fit a wider range of pressure in the 5V signal, the voltage it produces does not equal the same air pressure at the same voltage as a 1 BAR sensor. As long as the signals are within the correct range, the pcm doesn't think there's a problem. This is why people say don't use the 2 BAR without the reflash. The PCM will read the lower voltage of the 2 BAR sensor and think it means less load, so it will increase spark advance and decrease fuel.
Newer vehicles like the Saturn Ion have multiple pressure sensors and are often able to tell if one is giving a wrong reading by cross checking with others. A system with both a MAF and MAP sensor could also do this if programmed to.
That MAP sensor is the same one I use for my turbo applications. It's used on 3.8 supercharged engines and 6.5 turbo diesels as well as some Isuzu turbocharged vehicles.
HTH
-->Slow
Alright I understand it now. So I do indeed have a 2 bar. Thank You for clearing that up for me also I learned something new today. Thanks!
~Boost. Its what's for dinner!~
