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Recurrent idle problems


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For the last couple of weeks I have had recurrent idle problems on my 99. I get no CELs. I have run techron through the car twice. I have removed and cleaned the idle control valve which was covered inside with carbon build up, the MAF and throttle body. Provided only temporary relief for a day or two. Will there be codes to read eventhough I am not getting a CEL. Is it worth just replacing the ICV and seeing if that does the trick. It was really caked and though I soaked it with carb cleaner and let it sit and then cleaned it two more times there was still some carbon deposits left.

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Is it worth just replacing the ICV and seeing if that does the trick.
IMHO yes. The ICV has a solenoid that moves the valve. Sometimes the solenoid gets weak and sometimes they are just so gummed up they don't move smoothly or consistently.

How easy is it to clean the idle control valve? Any pics?
Isn't your car a MY2000?

Your car is an egas car and does not have an Idle Control Valve.

If you are having simple idle problems then you need to clean the throttle butterfly. They can get carbon'ed up and cause similar lumpy idle or idle hunting.

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How easy is it to clean the idle control valve? Any pics?Isn't your car a MY2000?

Your car is an egas car and does not have an Idle Control Valve.

If you are having simple idle problems then you need to clean the throttle butterfly. They can get carbon'ed up and cause similar lumpy idle or idle hunting.

any pic for throttle butterfly?

and how to clean it?

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Just take the air cleaner and intake tube off the throttle body - then using a spray carburetor or fuel injector cleaner spray the butterfly on both sides until it is clean (no black carbon). Don't get the spray on your paint as it will damage it. You can use your finger to hold it open or you can take the throttle body off the car like I did on this (egas) Boxster.

Tool Pants pic

post-2-1155828699_thumb.jpg

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