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Hello all,

I cannot justify going to any better forum and asking for advice. I should mention that it is a 99 996 C2 with 68K miles on the clock. I seem to be having progressing problem(s) with my idle (more pronounced in the last 2 months). I know this topic has been discussed until the cows come home, but I dont know what else to do before taking it to PORSCHE. Last week I changed air intake filter. spark plugs, and oil change, bottle of Techron and still no changes in idle. Can I reset ECU so car adjusts to the the recent tune up-is there a DIY for this. Like most cases it shudders when the car is warm and at a stop, but now I can actually feel it in my seat and look over to my passenger side seat and see it shake. No CEL light on. Also on some of the threads mentioned to clean the IACV or even using Gumout out in the butterfly intake- Can anyone elaborate on this, and or advise on more ways of eliminating any other variables within DIY range. Any Info is Greatly Appreciated.



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Hello Loren,

Thanks for the quick reply. I have owned the car for about 16 months now and have no record of the fuel filter ever being changed. With AC off it does idle steadily at 700 rpm fluctuating about 25 rpm up or down - very minimal-if even that! Never has it stumbled suddenly and seem to want to stall out. Are suggesting these are symptoms of a bad fuel filter. Do you also suggest that I pick up PORSCHE fuel filter and replace it. Sometimes I do run the car for half a week or so with 1/4 tank of fuel.

Thanks Again


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Well, it wouldn't hurt since you don't know when it was last changed. It is one more variable to remove.

Another thing to try would be to remove the battery connection for at least 5 minutes (be sure you have your radio code and radio stations written down). Disconnecting the battery will force the DME to reset and re-establish it's levels. After you re-connect the battery it should hunt at idle for a few minutes and then level out.

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Hello Loren,

This points me in another direction, thanks. Easiest thing first, I will get on disconnecting the battery. Do you have a DIY for this, I heard stories about trunk locking I don't know if there is connection between the two, don't want to find out. I also did a DIY search on fuel filter change and came up with nothing would you be able to help me out with this. You have been more than helpful Loren I will keep you posted on how it goes.



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