# Rough @ warm up **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** ls, lincoln\ **Created:** [August 14, 2012, 7:29pm UTC](https://community.cartalk.com/t/rough-warm-up/74080 "2012-08-14T19:29:22Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![almostdave](https://avatars.discourse-cdn.com/v4/letter/a/65b543/32.png) [@almostdave](https://community.cartalk.com/u/almostdave)\ **Post date:** [August 14, 2012, 7:29pm UTC](https://community.cartalk.com/t/rough-warm-up/74080/1 "2012-08-14T19:29:22Z")
My 2002 lincoln LS run rough after warm up. Check engine light code is EGR , replaced EGR ---
**Author:** ![the\_same\_mountainbike](https://avatars.discourse-cdn.com/v4/letter/t/c89c15/32.png) [@the\_same\_mountainbike](https://community.cartalk.com/u/the_same_mountainbike)\ **Post date:** [August 15, 2012, 2:44am UTC](https://community.cartalk.com/t/rough-warm-up/74080/2 "2012-08-15T02:44:04Z")
Valve or solenoid? Or both? Did you clean the orafice? ---
**Author:** ![George\_San\_Jose1](https://avatars.discourse-cdn.com/v4/letter/g/e5b9ba/32.png) [@George\_San\_Jose1](https://community.cartalk.com/u/George_San_Jose1)\ **Post date:** [August 15, 2012, 6:04am UTC](https://community.cartalk.com/t/rough-warm-up/74080/3 "2012-08-15T06:04:29Z")
And sometimes the problem isn’t the EGR valve itself, but the vacuum switching devices which control it. EGRs usually work by a vacuum line. They can stick open, or stick closed. When they become stuck closed, this usually doesn’t cause a drivability problem. Sometimes they can stick open, but since you installed a new one, that isn’t likely the problem. But the vacuum valve which allows the vacuum to get to the EGR and opens the EGR, if that fails or gets confused by some other sensor (like a temperature sensor) that has failed, then the EGR can open when it isn’t supposed to, and can cause a driveability problem.