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Re: idling problem when ac turned on honda civic lxi 1999
To my knowledge (at least in my country), some Honda Civics have a compensator solenoid the pushes on the throttle that adjust the engine's RPM to its standard idling when the A/C compressor is activated. Technically, this solenoid is nothing more but a coil and a plunger. When the compressor runs, the same relay activates this solenoid and pushes the plunger forward increasing the RPM. Pls check/clean/adjust/replace as deemed fit and necessary.
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.
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This IAC valve runs only when your foot is off the gas pedal. Mainly to keep the engine from stalling and keeping it at a safe RPM. If it is running bad under 2000RPM, more than likely its the IAC valve or a vacuum leak. Clean or replace the IAC valve....Hopefully this helps!!
First of all, a drop in power when AC turned on, is not uncommon due to the fact that it puts quite a noticeable load on a 4 cyl engine, but in saying that your IAC (idle air control motor) should be compensating for the extra load and adjusting idle to normal when this occurs. Try pulling the IAC off & clean it & port it comes out of real good with throttle body spray cleaner, and re-installl it and see if that helps. As far as steering jerking, take a close look at belt condition as well as tension on belt, as it may need adjustment or belt and/or tensioner replaced.
there is a wiring problem with some of them the wire shorts under the intake manifold that runs to the alternater. also the alternator on them seam to have a mind of their own and only work when they HAVE to and test good when load tested replace alt if the wires arent shorted