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Message: <blockquote data-quote="boyzone" data-source="post: 1064586079" data-attributes="member: 10370">Last night spent 1.5 hrs to DIY my idling.1st : I check my TPS voltage, observed unable to get 0.5v on idling regardless how I fine tune.Suspected my TPS faulty.2nd: I disconnect stepper motor to remove noise from stepper motor 3rd: I'm additional to install another FICD (2 in total) to step up my air con idling after disconnect stepper motor. Observed idling still unable to move up from 500~700 rpm4th: Disable breathing pipe as per poman input... Still the same.5th: Replace whole throttle body, connect back back stepper motor and remove all FICD.Observation: Idling is at 900~950 rpm after adjust on BISSWhen turn on the air con, step motor is step up to around 750 rpm.6th: Activate one of the FICD to further step up my idling.Observation: idling manage to step up to 950 rpm at initial stage. However, re-compensate back by step motor after 1, 2 min. Now idling at around 750~800 rpm.7th: Breathing pipe is still disconnect as observed idling speed more stable compared with connecting.8th: Further increase on FICD air pumping to increase to 950 rpmObservation: To be continue today after work <img src="https://zerotohundred.com/forums/styles/default/xenforo/smilies/biggrin.gif"  class="smilie" loading="lazy" alt=":biggrin:" title="Biggrin    :biggrin:" data-shortname=":biggrin:" /> Lesson learn: -One of the factor to have bad idling is TPS faulty / calibration out-Intake manifold's vacuum is draw out by something.. or leaking.-Stepper motor will compensate the idling as ECU pre-set idling when air con turn on-FICD only can step up the idling when the stepper motor is at minimum position (Almost full close)-Compressor with heavy load will step the idling down badly. Stock stepper motor unable to recover the pre-set idling even though with full open. Then FICD can help immediately.---------- Post added at 09:46 AM ---------- 6 hour anti-bump limit - Previous post was at 09:30 AM ----------Bro Kopi,No throttle lag as just running with 6A12 throttle body. Currently run with stock fuel pressure setting pair with e-manage <img src="https://zerotohundred.com/forums/styles/default/xenforo/smilies/biggrin.gif"  class="smilie" loading="lazy" alt=":biggrin:" title="Biggrin    :biggrin:" data-shortname=":biggrin:" /></blockquote>

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