Quote:
Originally Posted by kyngfish
Anecdotal but I’ve never had the car idle correctly since putting in a Steve Wong chip. Been 7 years or so. At first it would surge until engine was slightly warm. Now it will surge on startup until I blip the throttle. Then it’s fine. When I initially got the chip I contacted Steve and followed his instructions on setting idle to the letter. No change.
I’ve checked 11 different ways for a vac leak and never found anything. Idle drops accordingly when I pull the oil cap. Checked hoses cleaned idle control valve - replaced CHT sensor after testing. Replaced O2 sensor. Cleaned out throttle body. Nada. Someone I trust commented that the S Wong chip doesn’t always play nice with the idle valve. Couldn’t confirm or deny without replacing the valve which I just never bothered doing since it stated idling fine after blip.
If I had to make a bet - it’s the valve and I need to get a new one since the engine has been rebuilt now and it still does the same thing. Long ago when I went on a mission to find a new valve I found out that older Volvos used the same part but at a fraction of the price, still couldn’t find one OEM but I found the part using the Bosch part number instead of the Porsche one. They sell cheap ones now aftermarket. It’s a simple enough part that I would for sure run that risk if I felt like it. Can’t remember which part number is used tho.
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Numerous Porsche independent shops have reported this too! The idle typically "hangs" above 1000-1200 on decel.