# E-150 Ford Van 1999 service engine soon light

**URL:** <https://community.cartalk.com/t/e-150-ford-van-1999-service-engine-soon-light/44050>\
**Category:** Maintenance/Repairs\
**Tags:** e150, ford\
**Created:** [February 7, 2010, 8:15pm UTC](https://community.cartalk.com/t/e-150-ford-van-1999-service-engine-soon-light/44050 "2010-02-07T20:15:26Z")\
**Posts on this page:** 7\
**Page:** 1

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**Author:** ![pipeline](https://avatars.discourse-cdn.com/v4/letter/p/b9e5f3/32.png) [@pipeline](https://community.cartalk.com/u/pipeline)\
**Post date:** [February 7, 2010, 8:15pm UTC](https://community.cartalk.com/t/e-150-ford-van-1999-service-engine-soon-light/44050/1 "2010-02-07T20:15:26Z")

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service engine soon light on,changed spark plugs,2 o2 sensors,egr valve.-after warming up runs rough and when in gear at a stop light will stall sometimes but when nutral would run better.

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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:** [February 7, 2010, 8:17pm UTC](https://community.cartalk.com/t/e-150-ford-van-1999-service-engine-soon-light/44050/2 "2010-02-07T20:17:34Z")

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What diagnostic codes showed up?

Tester

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**Author:** ![pipeline](https://avatars.discourse-cdn.com/v4/letter/p/b9e5f3/32.png) [@pipeline](https://community.cartalk.com/u/pipeline)\
**Post date:** [February 8, 2010, 5:21am UTC](https://community.cartalk.com/t/e-150-ford-van-1999-service-engine-soon-light/44050/3 "2010-02-08T05:21:55Z")

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i belive 171 to lean

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**Author:** ![pipeline](https://avatars.discourse-cdn.com/v4/letter/p/b9e5f3/32.png) [@pipeline](https://community.cartalk.com/u/pipeline)\
**Post date:** [February 8, 2010, 5:25am UTC](https://community.cartalk.com/t/e-150-ford-van-1999-service-engine-soon-light/44050/4 "2010-02-08T05:25:08Z")

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i cleard the memory and have to wait for it to show up again

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**Author:** ![hellokit](https://avatars.discourse-cdn.com/v4/letter/h/6a8cbe/32.png) [@hellokit](https://community.cartalk.com/u/hellokit)\
**Post date:** [February 8, 2010, 12:06pm UTC](https://community.cartalk.com/t/e-150-ford-van-1999-service-engine-soon-light/44050/5 "2010-02-08T12:06:59Z")

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Would you believe, it REALLY is running too lean?!

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**Author:** ![pipeline](https://avatars.discourse-cdn.com/v4/letter/p/b9e5f3/32.png) [@pipeline](https://community.cartalk.com/u/pipeline)\
**Post date:** [February 9, 2010, 4:30pm UTC](https://community.cartalk.com/t/e-150-ford-van-1999-service-engine-soon-light/44050/6 "2010-02-09T16:30:37Z")

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yes a little ,but what to do?It ran better for a while after clearing the memory and im going to check the code today.the idol speed cant be adjusted on this van.

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**Author:** ![cigroller](https://avatars.discourse-cdn.com/v4/letter/c/c68b51/32.png) [@cigroller](https://community.cartalk.com/u/cigroller)\
**Post date:** [February 9, 2010, 4:41pm UTC](https://community.cartalk.com/t/e-150-ford-van-1999-service-engine-soon-light/44050/7 "2010-02-09T16:41:13Z")

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The first thing to do is to verify the code.

If it is P0171 (system lean on bank 1) then the first thing I would do is clean the mass airflow sensor. Then I would check for vacuum leaks. Then I would replace the fuel filter and check the fuel pressure. These are cheap and easy things that often work.

Can you better describe “runs rough?” Does the idle surge & fall/surge & fall? Or what?