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Message: <blockquote data-quote="purple_EJ7" data-source="post: 2816866" data-attributes="member: 51107"><p>Hi, though this is a very old thread but I find the is very interesting so I think I'll just share some of my experience on my friend's wira. Most proton will have the stepper motor IAC which consist of 2 coils & 1 ballscrew. The coils are the ones that usually becomes faulty. How to know? Take a good IAC and measure the resistance (in ohm) between terminals of each coil. Compare it with yours, it should be the same. I didn't remember the values but we took a halfcut IAC, which happens to have 1 faulty coil, swapped it with a good coil from the existing IAC (which also have 1 of the coils faulty, main reason of getting a new IAC) and we were good to go. For Honda Civic, well, mine is using duty control ACV (my car is auto, so it maybe different for manual). Not sure how to check but I believe a computer diagnostic should be able to capture the faulty ACV. TPS (the that sticks to the TB butterfly) can also be checked using multimeter. Take off a good TB, measure the initial resistance of the TPS. This value should be the same for all TB of the same model. When you open the butterfly, resistance value should change. if not, then yours is faulty. WARNING!! do not adjust the TPS if you do not know what you are doing. A slight movement of the TPS will make your idle change drastically, believe me. If you really want to adjust it, make sure you find your own skill or method on how to lock the TPS screw without moving it during tightening. Good luck on that because the last time my friend tried to adjust it, it took us more than an hour.<img src="https://zerotohundred.com/forums/styles/default/xenforo/smilies/biggrin.gif"  class="smilie" loading="lazy" alt=":biggrin:" title="Biggrin    :biggrin:" data-shortname=":biggrin:" /></p></blockquote><p></p>

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