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Rough Idle on 2003 Pt- Not plugs and wires

 
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Old 12 Mar 2007, 09:34 pm
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Default Rough Idle on 2003 Pt- Not plugs and wires

I know this has been covered in the past but my problem seems different. I have changed plugs and wires with no change. I get no error codes on my EBDII reader. I did notice that the problem seems worse with the heater or air conditioner on when the cooling fan starts. Also the O2 sensor output is a sine wave when it is running smoothly but the wave form distorts when the engine stumbles. I don't know if the O2 sensor is just reporting what is happening or is the cause of the problem. Also when the idle is held above 1000rpm it does not stumble. I am thinking it may be the coil or the O2 sensor. Any help would be appreciated.

Thanks,
Jim
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Old 13 Mar 2007, 08:09 am
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Here's a long read, but might be your problem:
http://ptenthusiasts.org/forum/showt...highlight=idle

and another one:
http://ptenthusiasts.org/forum/showt...&highlight=IAC

since you mention it's worse with A/C, might be the IAC.
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Old 13 Mar 2007, 04:03 pm
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I was out to check and the stumbling problem is not related to the heater or A/C systems. It starts to stumble when the cooling fan starts and continues as long as it is running. I will try the WD-40 trick tonight after work.

Jim
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Old 14 Mar 2007, 08:47 am
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Good luck, and keep us posted.
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Old 14 Mar 2007, 11:10 am
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welcome to the board !! good luck !!
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Old 26 Mar 2007, 10:26 pm
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I read something similar on another site and they stated that it sounded like the EGR Solenoid/Valve. You may want to check that.
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Old 27 Mar 2007, 09:22 am
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hey jim, did you fiqure out the problem ??
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