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P1450 Diagnostic Trouble Code Discussion for February 2011

Barometric Pressure Sensor Circuit Malfunction

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Trouble Ticket Help Requests for DTC P1450
Help Request Posted
1997 Mercury Grand Marquis GS 4.6L p1450 in memory VIN: 2MELM74W8V
P1450: Excessive vacuum. ... test, ck the monitors. Found a p1450 excessive vacuum in the evap system. Ckd. vent valve & control valve. Both ok. Test drove, came back with FTP at .33v. Took off the gas cap and removed the vent valve. FTP stayed at .33v. Hooked up smoke machine and...
February 25, 2011