At engine idle flicker is not noticiable. But increase rpm and headlights and all dash lights quickly surge up and down- a slight flickering. Radio is also affected. Is this the alternator? brushes? No starting problem. Is there a modulator? How do I troubleshoot this problem?
Thanks for your help
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Re: all lights on 2000 honda civic flicker
Sounds like you have a voltage regulator problem which is in the alternator, not changable. would recommend taking it to a battery store and have them do a load test. more and likely you need a new alternator
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Firstly, turning on the headlamps applies an electrical load onto the battery and charging system.
The charging system will sense the load and increase it's output to compensate.. This compensation is why the idle RPM drops.
The alternator is driven by the engine so when the alternator has to work harder, the engine has to work harder too..
Loss of break lamps usually means a blown fuse so check all the fuses.
Check the lamp switch too..
You might even find the lamp check relay has developed a fault..
But, I would suspect a fuse or switch before anything else..
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!!
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.
Good luck and kind regards. Thank you for using FixYa.
dude its normal for first start or cold start that the idle is ok but it must high than normal... its normal because the engine is warming up it self... when it gets warm, the idle speed will return normal idle... your engine is 1200cc, it has not much HP for a great load... and i know its a carburatored engine and its an old engine, your head lyt and a/c fan and aux fan and all the electrical system on your car, uses the HP of you engine and its a lot of load to the alternator driven by the engine to generate an electricity they need and thats why the engine rpm speed lowering down to dead and its shake. thats why when you use your lyts or all electrical, you engine is weakening... the best remede is adjusting you idle speed... its located behind the carburator.. its a small black knob.. just make a twist each eighter way and you'll find out if your idle rpm speed ts incresing or decresing.. just increase it and try opening your lyts and other electrical, if its still shaking then adjust it a little more