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High Idle - Not IAC?? 700 1991

uid 18083's pic
posted by  lucid on  Thu Aug 5 12:51 CST 2010
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last visit: Fri Oct 24 12:31 CST 2014
[RELATED]

• I don't think the ETC has anything to do with the IAC, compared to fuel mixture. And there are OBD codes related to the ECT sensor, with a check engine light. What was the problem with the OBD procedure?

• The Air temp sensor has nothing to do with the IAC, and will will also set an OBD code with a CEL if it's signal is too high or low.

I know you believe the IAC itself is OK, but a good test would be (with engine at a warm idle) to pinch off the hose leading into it from the big hose at the throttle body. With the ETC air source now cut off, the idle speed should drop to around 500 rpm. Even stalling is OK.

Anything else means air leaking in from somewhere, problems with the throttle linkage, stop screw, etc.

If it does slow down or stall when the IAC hose is pinched off, that confirms that too much IAC air is the problem. That could mean TPSwitch adjustment, bad switch, or harness plug contacts, preventing the ECU from setting the normal idle speed.

--
Bruce Young, '93 940-NA (current), 240s (one V8), 140s, 122s, since '63.






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