Some GM vehicles use the MAP sensor as a baro sensor as the key is turned on but but before startup to read the current barometric pressure.
The '94 turbodiesel pickup I'm working with now has ONE sensor... baro BEFORE startup, then EGR apply vacuum AFTER startup. I know some gassers are set up that way, as well.
As a cheap diagnostic test you might try "T"ing a vacuum gauge into the EGR apply line and see if it has vacuum when the EGR would be applied, typically at crusing speeds.
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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