bajacalal said:It doesn't really open the butterfly though (although some carb applications had a system like this) it pushes a metal cone (plunger) into a mated seat (hole) regulating the flow of air (controlling idle speed).
Lou said:
ajpulley said:If I'm not mistaken, at least for the Renix computers, when you unplug IAC when engine if off, then start engine, IAC will not respoond to ECM's comand to open then ramp down (idle raises then lowers quickly). If the engine is in good shape, it should start OK and just idle low, depending on what the stop screw it adjusted to. Mine does at least. Maybe the post-90 4.0s are a bit different. I had a wierd idle issue that took me two years to figure out- turned out to be a throtlebody issue. I doubt its a common thing.
Yup, maybe it might help you, or someone. I had a real weird idle issue that I finally figured it was more pronounced when engine was warm, and after cleaning the intake (usually once a year). I would check everything, and assumed it to be the IAC motor. Guess what...Cherokeelaredo said:Can you please specify,I am experiencing some idle issues on my 89 4.0.
Low, erratic, etc.
thanks.