# Egr Valve

**URL:** <https://community.cartalk.com/t/egr-valve/25447>\
**Category:** Maintenance/Repairs\
**Created:** [January 24, 2009, 5:12pm UTC](https://community.cartalk.com/t/egr-valve/25447 "2009-01-24T17:12:41Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![donb505](https://avatars.discourse-cdn.com/v4/letter/d/5f9b8f/32.png) [@donb505](https://community.cartalk.com/u/donb505)\
**Post date:** [January 24, 2009, 5:12pm UTC](https://community.cartalk.com/t/egr-valve/25447/1 "2009-01-24T17:12:41Z")

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How do you find out if the egr valve or the electronic sensor on top of the egr valve is bad 94 f-250 351 motor

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**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\
**Post date:** [January 24, 2009, 5:26pm UTC](https://community.cartalk.com/t/egr-valve/25447/2 "2009-01-24T17:26:05Z")

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Get the engine up to operating temperature and then turn it off. Remove the vacuum hose from the EGR valve and plug it, and connect a hand vacuum pump to the EGR valve. At the tail pipe, clamp on a socket or something simular that almost completely blocks the tail pipe. Start the engine and apply a vacuum to the EGR valve. If the EGR valve is good, the engine will start to stumble and/or stall when the vacuum is applied to the EGR valve.

Tester

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**Author:** ![pleasedodgevan](https://avatars.discourse-cdn.com/v4/letter/p/51bf81/32.png) [@pleasedodgevan](https://community.cartalk.com/u/pleasedodgevan)\
**Post date:** [January 24, 2009, 7:26pm UTC](https://community.cartalk.com/t/egr-valve/25447/3 "2009-01-24T19:26:16Z")

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Reading the code might just tell you that it’s the sensor. It might not too. The test mention previously is good too.