A/C Idle up problem

2000 HYUNDAI ELANTRA
130,000 MILES • 4 CYL • AUTOMATIC
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NISHATH
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I ve a Hyundai Elentra 2000 1.6 Car. Having a problem of A/C idling as when switch on the A/C rpm is going down causing car to vibrate and jumps back to normal reading of 750 rpm. i ve done all repairs as changed my Plugs,H.T wire and Coils and also gave a full engine tune up. now one meachanic suspects its a case with ECU not giving proper signals. is it possible? are there any other ways to come out of this? Pls Advice
Jul 22, 2011 at 6:36 AM
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WRENCHTECH
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The vibration part may not be so unusual due to the increased load from the A/C. It may have weak motor mounts too making it seem worse.
You may have a bad IAC ( idle air control) but try eliminating any vacuum leaks and cleaning the throttle body first. Remove the intake snorkel, have someone hold the throttle wide open for you and scrub the back side of the throttle plate and surrounding bore with an old tooth brush and some carb cleaner. Be sure to spray some into the small holes next to the throttle plate. That should help stabilize the idle. If it still has a problem, replace the IAC
Jul 22, 2011 at 10:10 AM