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Old 01-28-2013, 07:37 PM
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It could be that it has developed a MAP sensor problem,either the sensor value is skewed, or the vacuum signal to it is not correct becusae of a blockage at the port for which it is hooked to. Check that out to see if it is clean, then scan live data and check the PID to see if it is within specs.
Reason I say this is because when the EGR is pulled open, the MAP sensor is used to measure a drop in intake vacuum, basically to signal the computer that the EGR is opening, causing a drop in vacuum.
Check it out.
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