# Check Engine light

**URL:** <https://community.cartalk.com/t/check-engine-light/43483>\
**Category:** Maintenance/Repairs\
**Tags:** ford, f150\
**Created:** [January 30, 2010, 7:00pm UTC](https://community.cartalk.com/t/check-engine-light/43483 "2010-01-30T19:00:36Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Setterz](https://avatars.discourse-cdn.com/v4/letter/s/bc79bd/32.png) [@Setterz](https://community.cartalk.com/u/Setterz)\
**Post date:** [January 30, 2010, 7:00pm UTC](https://community.cartalk.com/t/check-engine-light/43483/1 "2010-01-30T19:00:36Z")

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I have a 1994 Ford F150 small block truck. It has about 130,000 miles on it & runs great. However, on cool foggy days the check engine light comes on. Then it does not come on again until it is another cool/cold foggy day. What’s up with that?

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**Author:** ![Caddyman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/caddyman/32/23_2.png) [@Caddyman](https://community.cartalk.com/u/Caddyman)\
**Post date:** [January 30, 2010, 7:04pm UTC](https://community.cartalk.com/t/check-engine-light/43483/2 "2010-01-30T19:04:29Z")

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Maybe a parts store can read the codes and tell you WHAT is making the light come on… Then you can decide whether to fix it or ignore it…

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**Author:** ![Hiroshi](https://avatars.discourse-cdn.com/v4/letter/h/b5ac83/32.png) [@Hiroshi](https://community.cartalk.com/u/Hiroshi)\
**Post date:** [January 30, 2010, 7:09pm UTC](https://community.cartalk.com/t/check-engine-light/43483/3 "2010-01-30T19:09:36Z")

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I don’t think you have a OBTII style system so you need to go to a auto repair shop to have the codes checked. To me it sound as if the engine isn’t getting warmed up properly and the ECM senses that. Might be a defective thermostat

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**Author:** ![BustedKnuckles](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/bustedknuckles/32/25_2.png) [@BustedKnuckles](https://community.cartalk.com/u/BustedKnuckles)\
**Post date:** [January 30, 2010, 7:14pm UTC](https://community.cartalk.com/t/check-engine-light/43483/4 "2010-01-30T19:14:18Z")

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The ‘Check Engine’ light is how your truck’s ECM tells you it thinks there’s a problem. First thing is to extract the code. This link describes the process, since your truck is OBD-I, and includes the codes list. [http://www.troublecodes.net/Ford/](http://www.troublecodes.net/Ford/). Post the codes here, and we can help further.