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 Aviator Check Engine Light Due to PCV Grommet Vacuum Leaks
Lincoln Aviator Problem
Average Mileage: 98,288 mi (63,000 mi - 155,000 mi)
Visitor, 2004 Lincoln Aviator
OMG!!! you saved me hundreds of dollars, thank you. fire stone did a diagnostic($89.00) and it had more than one bad read. my husband checked this site and the total repair was $7.27 for a small piece of hose.this site is wonderful.
Yep just replaced this too along with the rack and pinion AND the transmission. Love the vehicle, very disappointed in Ford. It's becoming a very expensive lemon.
Visitor, 2003 Lincoln Aviator, 120,000 mi
I had the same problem with the elbow on this pcv hose. The elbow also collapsed and was very brittle it should be a metal fitting. This website saved me a ton of money thanks to all!
Visitor, 2004 Lincoln Aviator, 100,400 mi
Error code P0174, "System too lean (bank 2)".
Visitor, 2004 Lincoln Aviator, 96,000 mi
There is a loud hissing sound coming from a hose with a foam like elbow attached to the intake. I can't find parts and its getting called different things like emissions hose, vacuum hose, pcv hose. No one seems to know what it is. It's on the passenger side. My car is hesitating and bogging down when I stop. Check engine light is on. I wish I could post a pic.
Visitor, 2004 Lincoln Aviator, 155,000 mi
This situation happens to me and I replace the elbow on the PCV and it fixed the situation.
Visitor, 2003 Lincoln Aviator, 73,000 mi
I had the same problem which escalated yesterday. It took a while to throw the codes to finally trouble shoot this.
Visitor, 2005 Lincoln Aviator, 63,000 mi
Just found that problem out today!
My car started running really rough, and I think my engine light came on if I remember right. I took it in and they said it was a vacuum leak. I had to replace the hoses. Of course, it ended up being several hundred dollars.
Visitor, 2003 Lincoln Aviator, 110,000 mi
Collapsed PVC elbow. Replaced it for 7.00 usd. Found at local auto parts store.