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Old 04-13-2015, 08:29 PM   #1 (permalink)
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Default Dash and Interior lights flickering!

I've been having this issue with my lights flickering on my 2000 Civic EX. The instrument cluster, headlights, and interior lights (dome light and map light). I have been chasing this for several months now and I can't seem to get it. Here's what usually happens:
-Pressing brake pedal while stopped will make lights flicker or stabilize, depending on what it's doing before I press the brake pedal
-lights are stable when driving

Here's what I've done to try to eliminate it:
-clean all body grounds (including that one on the thermostat housing)
-tested alternator from battery (measuring voltage on battery while car is running, then turn everything on and measure again) -> with everything on, the voltage only dropped from 14.5V to about 13.1V
-tightened power wire on top of alternator
-7.5A fuse #15 under the dash has been replaced and isn't blowing
-the wires under the intake manifold are already protected with corrugated plastic tubing and are NOT shorting out on metal
-alternator belt is tight and alternator is secured

Is there anything else I can check or test before I go out and buy a new alternator?
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Old 04-13-2015, 08:42 PM   #2 (permalink)
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I got same car as you have and got same thing but not always only some times. I didn't do anything yet to resolve the problem. Maybe too low idle, when I press little more gas it stabilize. Usually if I'm standing on light I got around 700 rpm, but if I'm holding the brake RPM go down to 650 and lights starts blinkering sometimes.
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Old 04-13-2015, 09:16 PM   #3 (permalink)
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My idle is actually a little high when my headlights are on. It kinda sits around 900rpm. Without headlights, it sits around 500-600rpm. I'm sometimes worried about how much it varies.
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2000 Civic EX coupe D16Y8 5MT
-Hawk HPS 5.0 pads/Duralast Gold Rotors
-Blox short shifter
-Exedy Stage 1 clutch
-Koni Yellows/Megan Coilover sleeves
-DC2 rear swaybar/BWR bracing
-Energy Suspension poly bushings
-eGay front strut bar
-4th gen Prelude front seats
-Koyorad radiator
-AEM Short Ram/Blox V-stack
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Old 04-13-2015, 09:40 PM   #4 (permalink)
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Quote:
Originally Posted by ThumperCivic View Post
My idle is actually a little high when my headlights are on. It kinda sits around 900rpm. Without headlights, it sits around 500-600rpm. I'm sometimes worried about how much it varies.
Do you using obd2 scanner to read rpms or you just look on dash gauge? Because I'm using scanner and I now rpms exactly. My rpms don't react on head lights so much but also raising little bit when I turning headlights on.

Maybe you need to clean IACV valve - idle air control valve on intake manifold to stabilize rpm, and it will change more smother no crazy jumping. Maybe your IACV not running smooth and rpm bounce or go with delay. For me its hard to explain because Ukrainian and Russian my first language!

My idle also is changing when weather is changing - summer winter spring. I'm adjusting idle screw on throttle body to make RPM around 650-700 because if i go lower my car starts to shake and vibrate a lot.
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Old 04-13-2015, 09:41 PM   #5 (permalink)
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Meet your ELD - Electrical Load Detector.... - Honda Civic Forum


you idle changes with the weather as the ECU compensates the fuel maps for the inlet temps.. cpmpletely normal
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Old 04-13-2015, 09:58 PM   #6 (permalink)
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Originally Posted by Esotericimage View Post
Meet your ELD - Electrical Load Detector.... - Honda Civic Forum


you idle changes with the weather as the ECU compensates the fuel maps for the inlet temps.. cpmpletely normal
Thanks a lot for the thread, and explanation. Great information. I not gonna touch the ELD because I trust the Honda. I already touched a lot of things, couple years ago try to do some things to my first car and spend a lot of money where it was not needed. But lesson learned - research before doing something.
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Old 04-13-2015, 10:57 PM   #7 (permalink)
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I have already cleaned my IACV. So the lights are supposed to flicker like that? I admit my stereo isn't the factory unit and I have some extra lights for the footwells. From the sounds of the article, I guess that's totally normal?
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2000 Civic EX coupe D16Y8 5MT
-Hawk HPS 5.0 pads/Duralast Gold Rotors
-Blox short shifter
-Exedy Stage 1 clutch
-Koni Yellows/Megan Coilover sleeves
-DC2 rear swaybar/BWR bracing
-Energy Suspension poly bushings
-eGay front strut bar
-4th gen Prelude front seats
-Koyorad radiator
-AEM Short Ram/Blox V-stack
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Old 04-14-2015, 06:09 AM   #8 (permalink)
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It could be the voltage reg. in the alt. Going bad, putting out some ac and causing the flicker.
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Old 04-18-2015, 11:09 AM   #9 (permalink)
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Check the grounds on the dash and so forth.

If that is all good, I would suspect the fuse box or harness to the fuse box. Inspect for moisture damage and do voltage drop tests to confirm.
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