Nburns Posted August 13, 2016 Report Share Posted August 13, 2016 Hi, have just started up my 2jz gte for the first time and it will jump straight up to 4000 rpm ( rpm limit ) and wont idle at set 1000 rpm. Using 6 wire stepper motor.Cheers Quote Link to comment Share on other sites More sharing options...
Steve Posted August 13, 2016 Report Share Posted August 13, 2016 Well to idle that high it must have "alot" of air. So where is it coming from. Partialy open throttle or vacum leak comes to mind. Quote Link to comment Share on other sites More sharing options...
JMP Posted August 13, 2016 Report Share Posted August 13, 2016 did you tune the base idle table steps in open loop before enabling closed loop? Quote Link to comment Share on other sites More sharing options...
Chris250 Posted August 13, 2016 Report Share Posted August 13, 2016 It sounds like you getting a lot of air in after the throttle plate. Look at the mechanicals first as the only time I've seen something similar was when someone had fitted a greddy intake to an SR20 and never blocked the spare ports. Quote Link to comment Share on other sites More sharing options...
Rich RDE Posted August 13, 2016 Report Share Posted August 13, 2016 Bump for the Air leak! Very common to overlook. Plus I would see where the MAP value is. This will give you a very good indication of vacuum leak. Quote Link to comment Share on other sites More sharing options...
Adamw Posted August 13, 2016 Report Share Posted August 13, 2016 Actually I know for sure (at least on the JDM 2JZ's that we see down here in NZ) the stepper can bypass enough air to get over 4000RPM, so I wouldnt yet rule out that it could be IAC settings. If you are using closed loop, switch to open loop and play around (or zero out) with base position table to see if it has any effect. On some 2JZ you have to set motor direction to reversed.Set all the step tables to zero - AC step, startup step, power steer, park/neutral, etc. I have reported to link a few months ago that some of these "adjustment steps" invoke by themselves without even a DI assigned to them so there may be some odd bugs in this feature. Quote Link to comment Share on other sites More sharing options...
Nburns Posted August 14, 2016 Author Report Share Posted August 14, 2016 Turns out the throttle body ( GM 102mm electronic) wants to sit at 22%. It looks like 22% is it neutral point. Quote Link to comment Share on other sites More sharing options...
Steve Posted August 14, 2016 Report Share Posted August 14, 2016 Do i get a price then? Quote Link to comment Share on other sites More sharing options...
Scott Posted August 15, 2016 Report Share Posted August 15, 2016 Turns out the throttle body ( GM 102mm electronic) wants to sit at 22%. It looks like 22% is it neutral point. When you say electronic do you mean an e-throttle body? If yes then this will do your idle control and the stepper motor will not be required. Once properly setup an E-throttle body should be able to be controlled from 0 to 100% opening.Scott Quote Link to comment Share on other sites More sharing options...
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