ykchong4 Posted April 1, 2021 Report Share Posted April 1, 2021 I'm using 3 wires Toyota ISC valve into engine with high cam fitted. when engine idle at 900rpm, MAP read vacuum about 80kpa. The ISC seem only working in between 50%-75%, out of this rpm range the engine speed will no changes, i'm believe due to poor vacuum because of high cam overlapping too much. It is better to use AlphaN tuning for more better idle control? Possible to have dual target idle RPM for G4+ with retain the close loop idle control? The engine still can idle fine, but when AC switch on it will pull down engine RPM too much from target idle RPM , and then the idle ignition control will add more ignition timing. Quote Link to comment Share on other sites More sharing options...
Adamw Posted April 1, 2021 Report Share Posted April 1, 2021 Can you attach the tune an a log so we can see your settings. It would be unusual for an idle valve to only have influence from 50-75%. Quote Link to comment Share on other sites More sharing options...
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