# Grand prix issue

**URL:** <https://community.cartalk.com/t/grand-prix-issue/151039>\
**Category:** Maintenance/Repairs\
**Created:** [October 19, 2019, 12:18am UTC](https://community.cartalk.com/t/grand-prix-issue/151039 "2019-10-19T00:18:25Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![Cheyenne\_Forge](https://avatars.discourse-cdn.com/v4/letter/c/8baadc/32.png) [@Cheyenne\_Forge](https://community.cartalk.com/u/Cheyenne_Forge)\
**Post date:** [October 19, 2019, 12:18am UTC](https://community.cartalk.com/t/grand-prix-issue/151039/1 "2019-10-19T00:18:25Z")

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I have a 2004 grand prix. Earlier this week my car started to reduce acceleration. So i pulled over and turned the car off and yried to start it but wouldnt start. I ended up replacing the alternator. The car started working fine again. Then today i was on the highway and the reduced engine power came on again and i couldn’t accelerate anymore. I had to coast off the highway. I turned my car off and sat for a minute then started it up again and then i was able to push the gas once agaun and drive off. What could cause this?

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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:** [October 19, 2019, 12:25am UTC](https://community.cartalk.com/t/grand-prix-issue/151039/2 "2019-10-19T00:25:24Z")

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There may be a problem with the accelerator pedal position sensor.

[https://www.rockauto.com/en/catalog/pontiac,2004,grand+prix,3.8l+v6,1429703,interior,accelerator+pedal+position+sensor,5061](https://www.rockauto.com/en/catalog/pontiac,2004,grand+prix,3.8l+v6,1429703,interior,accelerator+pedal+position+sensor,5061)

Instead of having a throttle cable from the accelerator pedal to the throttle body. your vehicle has an electronic throttle body.

The accelerator pedal position sensor sends a signal to the computer, and the computer operates the electronic throttle body from that signal.

Tester

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**Author:** ![Anthony\_Edwards](https://avatars.discourse-cdn.com/v4/letter/a/aca169/32.png) [@Anthony\_Edwards](https://community.cartalk.com/u/Anthony_Edwards)\
**Post date:** [October 20, 2019, 6:57am UTC](https://community.cartalk.com/t/grand-prix-issue/151039/3 "2019-10-20T06:57:52Z")

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Crankshaft position sensor

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**Author:** ![Anthony\_Edwards](https://avatars.discourse-cdn.com/v4/letter/a/aca169/32.png) [@Anthony\_Edwards](https://community.cartalk.com/u/Anthony_Edwards)\
**Post date:** [October 20, 2019, 7:09am UTC](https://community.cartalk.com/t/grand-prix-issue/151039/4 "2019-10-20T07:09:25Z")

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I have a 06 Grand Prix and have had this issue , trust me you are going to go Thur 100 things trying to figure this out , due your self a favor go get the sensor for 50$ , a harmonic balancer puller and a impact gun to break the bolt off the sensor will be behind it , I can walk you through the removal process trust me I have done everything under the son to these engines and models, I even replaced the hole wiring harness .

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**Author:** ![db4690](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/db4690/32/2583_2.png) [@db4690](https://community.cartalk.com/u/db4690)\
**Post date:** [October 20, 2019, 6:51pm UTC](https://community.cartalk.com/t/grand-prix-issue/151039/5 "2019-10-20T18:51:38Z")

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I doubt it’s the crankshaft position sensor . . .

The symptoms are wrong, in my opinion