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P1491 Diagnostic Trouble Code Discussion for October 2008

EVAP Vacuum Cut Valve/Bypass Circuit Malfunction

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Trouble Ticket Help Requests for DTC P1491
Help Request Posted
2001 Nissan Pathfinder LE 3.5L Poor engine power VIN: JN8DR09Y01
P1491: EVAP Vacuum Cut Valve/Bypass Circuit Malfunction. This vehicle has been a challenge for us. Complaint is poor power on accelleration (will cruise at 120 - 130 kmph but is a slug getting there). Will list the tests performed. Before we start we did try a new oem MAF sensor after the basic tests were performed ...
October 20, 2008