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post #1 of 6 (permalink) Old 05-28-2017, 12:57 PM Thread Starter
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I have a 2007 Chevy Cobalt LS. Recently the check engine light came on so I stopped by Advance Auto to have the code diagnosed. I was told the throttle body sensor or the pedal position sensor was bad. After a few days the light went off so I thought the problem was solved but later it came on again for about a week then went out. This time I replaced the throttle body sensor. It's been two weeks and the light is still off but the engine is still hard to start. It normally starts immediately but now it takes several attempts to get it started. Would the pedal position sensor cause this? I know Advance Auto Parts diagnosed it as being one of two sensors but I hate to keep buying sensors and find out they don't solve the problem. Any suggestions?
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post #2 of 6 (permalink) Old 05-28-2017, 01:10 PM
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Originally Posted by Poppie51 View Post
I have a 2007 Chevy Cobalt LS. Recently the check engine light came on so I stopped by Advance Auto to have the code diagnosed. I was told the throttle body sensor or the pedal position sensor was bad. After a few days the light went off so I thought the problem was solved but later it came on again for about a week then went out. This time I replaced the throttle body sensor. It's been two weeks and the light is still off but the engine is still hard to start. It normally starts immediately but now it takes several attempts to get it started. Would the pedal position sensor cause this? I know Advance Auto Parts diagnosed it as being one of two sensors but I hate to keep buying sensors and find out they don't solve the problem. Any suggestions?
Have you cleaned the throttle body? Reading a response to this problem on another forum, guy found that dirt build up prevented the throttle butterfly responding correctly to the pedal position.

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post #3 of 6 (permalink) Old 05-28-2017, 01:28 PM
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This time I replaced the throttle body sensor.
Didn't think you could buy the throttle body position sensor separately. Never seen one!

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post #4 of 6 (permalink) Old 05-28-2017, 01:43 PM Thread Starter
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Part of the throttle body was made onto the throttle body sensor that I replaced but I haven't cleaned the part that wasn't replaced. I put marvel mystery in two tanks of gas and sea foam into one tank but that may not have cleaned the system good enough. What is the best cleaner to use on a throttle body?
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post #5 of 6 (permalink) Old 05-28-2017, 01:59 PM
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I used with good success on a 1999 Cavalier Z24 with 135k miles. Noticably smoother idle. Cleaned the MAF, too.
http://www.crcindustries.com/product...kit-05111.html
This is availabke from Walmart for around $8.00.

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post #6 of 6 (permalink) Old 05-28-2017, 02:38 PM Thread Starter
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Would I need to remove the top half of the throttle body to clean the part of the throttle body that wasn't replaced? I would think it would be best especially since it's easy to remove. Thanks for all the advice from everyone.
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