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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: 1261054" data-attributes="member: 18628"><p>The idle speed is controlled by the chip via the IAC in the throttle body.</p><p></p><p>The screw on the throttle arm is for setting the minimum idle speed only.</p><p>The ECM has a built in keep alive table that will increase the engine rpm should it drop below 475.</p><p></p><p>You should perform the initial setup procedures(in the FI FAQs on binderplanet) and verify the IAC is actually working when you do it.</p><p></p><p>At a warm idle you should have very little suction in the port above the IAC. As you open the throttle it should increase.</p><p></p><p>Verify timing, TPS setting, and min idle screw.</p><p></p><p>If you give me the BCC letters off the ECM I can tell you what the idle speed should be.</p><p></p><p>If it's too low for you then you either reprogram the chip or turn up the min idle screw to over ride the IAC idle and then adjust the TPS back to .54v at idle.</p></blockquote><p></p>
[QUOTE="Bill USN-1, post: 1261054, member: 18628"] The idle speed is controlled by the chip via the IAC in the throttle body. The screw on the throttle arm is for setting the minimum idle speed only. The ECM has a built in keep alive table that will increase the engine rpm should it drop below 475. You should perform the initial setup procedures(in the FI FAQs on binderplanet) and verify the IAC is actually working when you do it. At a warm idle you should have very little suction in the port above the IAC. As you open the throttle it should increase. Verify timing, TPS setting, and min idle screw. If you give me the BCC letters off the ECM I can tell you what the idle speed should be. If it's too low for you then you either reprogram the chip or turn up the min idle screw to over ride the IAC idle and then adjust the TPS back to .54v at idle. [/QUOTE]
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Adjusting idle speed on '89 4.3 v6 (pre-Vortec)
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