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  1. 03-21-2015 #1
    Chewy1576
    Chewy1576 is offline
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    IAC not functioning correctly

    I feel like I have the 383 running fairly well on the 80 # injectors with the EGR disabled. The next issue I want to tackle is the idle speed. I am 90% sure that there is not a vacuum leak. This is the second new IAC I have put in, along with new connector. I have adjusted the minimum air screw to idle the engine at 600 RPM with the IAC closed. The ECM should be trying to adjust the idle to 750 RPM at operating temp. No matter what I do, I can't get the IAC counts below 48 and RPM below 950 with 0% throttle. I have attached the bin, ads, and xdf I have been using. Do you guys see anything that would keep the idle speed and IAC counts that high?
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    1990 Chevrolet K2500, RCLB, Blueprint 383 TBI (16197427 ECM / 61 lb/hr / 16 psi FP), NV4500, NP241C, 4.10
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