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IAC Mysterious Behavior 200

uid 18083's pic
posted by  lucid on  Tue Jun 29 00:59 CST 2004
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last visit: Fri Oct 24 12:31 CST 2014
[RELATED]

The ECT (Engine Coolant Temp) sensor might be telling the ECU it's way below zero, causing extra fuel at idle (?), temporarly "accomodated" by blipping the throttle off idle?

The resistance at 68° F when measured between ECU pins 2 and 5 (ground) should be in the 2300 ohm range. Bentley has a chart. Don't know about Haynes.

Bentley 390-5, fig. 10 shows two FI ground points to check and clean too (I think the ECU pin 5 ground comes back to one of these points).
--
Bruce Young
'93 940-NA (current) — 240s (one V8) — 140s — 122s — since '63.






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