Not idling properly - Pontiac GTO Forum
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post #1 of 12 (permalink) Old 11-18-2010, 01:51 PM Thread Starter
 
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Not idling properly

I've got an 04 and recently it is not idling correctly jumping from normal to less than 250RPM and then back up and i need to keep my foot on the gas to keep it running when im stopped, whats up?
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post #2 of 12 (permalink) Old 11-18-2010, 01:55 PM
 
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Could be a number of things, exhaust leak, bad 02, plug, wire, vac leak, dirty maf, ect.
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post #3 of 12 (permalink) Old 11-18-2010, 02:03 PM Thread Starter
 
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Last summer I put in ceramic coated LT headers and an SLP loudmouth exhaust with no cat....could that burn up O2 sensors?
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post #4 of 12 (permalink) Old 11-18-2010, 02:05 PM Thread Starter
 
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And an Airforce one cold air intake
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post #5 of 12 (permalink) Old 11-18-2010, 07:38 PM
 
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Originally Posted by BLUE04 View Post
Last summer I put in ceramic coated LT headers and an SLP loudmouth exhaust with no cat....could that burn up O2 sensors?
Front O2 helps the engine run, the rears(after the cat) only test your cats. Chances are since you have no cat, your rear O2 is turned off so even if they somehow were damaged, it wouldn't matter.
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post #6 of 12 (permalink) Old 11-18-2010, 08:28 PM Thread Starter
 
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? My buddy has a scanner and it said multiple mis fires and gave a P0300 code with no indication of which cylinder it was running like crap all the way there and when i left i was half way back home and it started running fine..
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post #7 of 12 (permalink) Old 11-18-2010, 09:24 PM
 
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I suspect a vacuum leak. Or bad ignition module?
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post #8 of 12 (permalink) Old 11-19-2010, 02:02 AM
 
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Bad idle air control in the t/b?

<-- Guess which ones quicker?.....Nope! Not even close.
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post #9 of 12 (permalink) Old 11-19-2010, 07:11 AM Thread Starter
 
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Drove it again today and it started doin the same thing and then it fixed itself....

Last edited by BLUE04; 11-19-2010 at 05:51 PM.
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post #10 of 12 (permalink) Old 12-12-2010, 09:45 AM
 
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I've only had my GTO about a month so I don't know if this helps. Maybe throttle position sensor? My SRT-4 did something similar and the wiring to the tps was bad.
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