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Rob 930 Rob 930 is offline
Registered User
Join Date: Dec 2002
Location: Seattle
Posts: 660
When you say you're "not using any idle control," what do you mean? Do you have the stock Carrera TB? Is there an idle air control motor in place? If not, what have you done about the ports that the IAC connect to? It sounds like you have a wide open IAC port between between the top and bottom of the throttle plate. If there's a hose connecting the two, pinch it off.

I was having trouble getting my idle to come down too, even with the throttle plate closed, I was seeing idle speeds of about 1900 RPM. The IAC didn't seem to have the range of flows necessary to control the idle (Carrera manifold, Edelbrock 70 mm TB, Bosch IAC motor, DTA ECU). For some reason, even when the IAC was "off" or "closed" there was still substantial air flow through it. I finally put a manual ball valve in the IAC circuit to cut down the air flow and bring it into range. Eventually, I may remove the valve and replace it with a restrictor.

Old 06-17-2007, 08:28 AM
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