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Tech & Fab
Adjusting idle speed on '89 4.3 v6 (pre-Vortec)
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<blockquote data-quote="Bill USN-1" data-source="post: 1261282" data-attributes="member: 18628"><p>Once the IAC is connected the ECM resets the IAC position upon turning the key off.</p><p>So a double reset is not needed.</p><p>If you use winaldl to watch the sensors and log data you will see the IAC position move to closed and then to the park position of 145 after you have already turned the key off.</p><p></p><p>But as I said before..you must verify the actual position of the IAC because the ECM only sends the signal to the IAC. There is no physical position feed back to the ECM for it to know where the IAC is.</p><p></p><p>So the numbers can say 5 counts or 200 counts and the IAC still be setting in the closed position.</p></blockquote><p></p>
[QUOTE="Bill USN-1, post: 1261282, member: 18628"] Once the IAC is connected the ECM resets the IAC position upon turning the key off. So a double reset is not needed. If you use winaldl to watch the sensors and log data you will see the IAC position move to closed and then to the park position of 145 after you have already turned the key off. But as I said before..you must verify the actual position of the IAC because the ECM only sends the signal to the IAC. There is no physical position feed back to the ECM for it to know where the IAC is. So the numbers can say 5 counts or 200 counts and the IAC still be setting in the closed position. [/QUOTE]
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Adjusting idle speed on '89 4.3 v6 (pre-Vortec)
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