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.Google+
Car Problem Reports
Lincoln Mark VIII Check Engine Light Due to PCV Grommet Vacuum Leaks
Lincoln Mark VIII Problem
Average Mileage: 97,500 mi (85,000 mi - 110,000 mi)
Visitor, 1993 Lincoln Mark VIII
The check engine light has been on and off for several years now. I had no idea that it may be something faulty until I read this notice about PCV Grommet Vacuum Leaks while checking for recalls on my 1993 Lincoln Mark VIII.
I never received a recall notice for any problem with my vehicle and am unsure as to who should be contacted about this problem.
Visitor, 1994 Lincoln Mark VIII
Check engine light comed on when engine is cold and going up a hill under a load. Does not happen all the time
Check engine light on miss firings