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I have honda civic ex 1997 manual, recently got some issues with radiator fan, there was some issue with engine area fuse box, replaced it with new fan motor and fuse box… all electricity checked up by professional mechanic in the car cabin and replaced all faulty fuses with new one. but still rpm drop and car vibrates whenever the headlights are on.
Some other info: When I turn on the AC the RPM goes up and then it adjust itself which is normal I guess but once AC is on the car have some vibrations.
RPM sometime fluctuate when I use power windows but sometimes it doesnt impact the rpm at all.
Should I change battery? does it have to do with distributor?
As far as my knowledge goes, I guess engine is not getting 3 main supplies on power demand.. Fuel, air and current.
Kindly advise what area to look and what to check to solve this problem.
I can post the video of the situation if additional info required on this.
Thanks.
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I would take it to a parts store and have then run an alternator and battery test. I had a similar issue in a previous car I owned and it ended up being the alternator was on its way out the door.
I second taking it to a parts store. They should do it for free. Or if you have a mutimeter you can do some basic checks with that. The battery should read 12.4 volts at minimum when the car is off and about 14 volts with the engine running. The voltage shouldn’t change very much with any accessories on and if it does then I’d look at the alternator. Just don’t test the current draw with the mutimeter or you’ll blow it up.
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