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Pontiac Forum: Grand Prix idles too high
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  #1  
Old March 2nd, 2018, 05:39 PM
bubbanm bubbanm is offline
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Grand Prix idles too high

I have a 2003 Grand Prix with the 3800 engine. I have replaced throttle position sensor, throttle body, and put a kit in the transmission but it still idles way too high. Any ideas what might be causing it. The changes above were codes from the check engine
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Old March 2nd, 2018, 05:55 PM
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melsg5 melsg5 is offline
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what codes do you have now?
have you checked for cracked/broken vacuum lines?
did you clean/adjust or replace the idle air control valve?
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Old March 5th, 2018, 11:09 AM
bubbanm bubbanm is offline
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I checked this weekend for broken vaccum lines but did not find any cracks. The iACV was replaced a few weeks ago but did not help. It does not do it all the time just about every other day. Also the motor will just cut off every once in a while while you are driving down the road.
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Old March 5th, 2018, 02:27 PM
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what codes are stored in the ecm? If you dont have a scan tool autozone does free code checks
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Old March 6th, 2018, 09:51 AM
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The only code was a misfire code. They said it didn't really amount to anything
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Old March 6th, 2018, 11:17 AM
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so you dont have the code?
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Old March 12th, 2018, 09:23 AM
bubbanm bubbanm is offline
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I finally go the codes checked again. P0121 and P0305
Are the codes that the reader gave at the parts house
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Old March 12th, 2018, 10:02 AM
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I have no idea how reading codes is related to "the parts house"
the P0121, considering you replaced the TPS and assuming you didnt get a bad one points to a wire harness issue. https://www.obd-codes.com/p0121
the P0305, shows cylinder number 5 is not firing
https://www.obd-codes.com/p0305
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