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 - Upgrading an Oliver Super 55 Electrical System - by Dennis Hawkins. My old Oliver Super 55 has been just sitting and rusting for several years now. I really hate to see a good tractor being treated that way, but not being able to start it without a 30 minute point filing ritual every time contributed to its demise. If it would just start when I turn the key, then I would use it more often. In addition to a bad case of old age, most of the tractor's original electrical system was simply too unreliable to keep. The main focus of this page is to show how I upgr
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