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Check Engine Light Due to a PCV System Vacuum Leak on Lincoln Navigator

Problem Description and Possible Solution

A vacuum leak from the PCV grommet vacuum leak can cause the Check Engine Light to illuminate. The molded rubber hose connections may crack and collapse, causing the vehicle to run roughly. A damaged PCV hose will require replacement.

Problem Data
RepairPal Verified
Average mileage: 149,073 (80,000–269,000)
7 model years affected: 1998, 1999, 2000, 2001, more2002, 2003, 2005
19 people reported this problem
Viewing 1 - 3 of 3 comments
Was hard starts and rough idle and broke down on me every time I stopped at a stop or traffic light I had to replace the pcv lines and all the fitting for it
My truck was idling rough, it would go up and down they shout off. I changed the pcv valve located under the hood by the driver side window and it ran great. The plastic that they used had to have come from the Mc Rib.
Check engine light illuminates and flashes
Loss of power when check engine light flashes
Changed gas line vaccume hose today
Still check engine light flashes and I lose power