hey. at night if my car is just idling and i turn my lights on ''2003 evo with HID'S'' the RPM drop and sometimes the car will die. the battery is good and so is the alternator ''stock''. what can i do to fix this issue? its getting annoying. if i am driving and then turn my lights on and come to a stock the car is fine. its only when at an idle and i turn them on.

i was thinking a more powerful alternator but i dont think that will do it. any tips??

 

How many watts is your HID kit?

 

its stock hid's

 

any ideas?

 

Well turning on the lights in the car will affect your RPMs a little. Wouldn't think that it would cause THAT steep of a drop. Did you check the wiring? Nothing shorting or grounding out? My only guess is that somewhere in the HID wiring (either by your fault or a short in the system) is that the wiring is faulty and overloading the alternator at startup, thus causing a big drop in power at idle. If you are running the car under load and turn them on you likely have a better source of power coming from the alternator and battery (i.e. the alternator is really working to output power and not just the meager voltage at idle). This is just an idea, could be completely wrong. If it barely dies and you can't find any issue with the wiring then you could always up the idle a little bit. If it is only a little drop and it still dies, maybe your idle is set too low.

Did this just start to happen all of a sudden?

 

What rpm does your car normally idle at?
What rpm does it drop to with the lights on?

-Acree

 

are you sure u had ur battery tested? sounds like its bad to me , once a load gets put on it the car stalls, is normally a battery issue. Did you do any installs lately that required wiring?

 

This, also check the battery terminals, are they loose, worn? Check the grounds.

 

make sure the charging system is at 14.5 volts and amps. you made have a bad idle speed motor not kicking up the idle under electrical load. does this happen when the ac is turn?

 

if you can drive and turn the lights on and the car still runs fine, its not going to be a battery or alternator guys.... if it was the alternator, the car would only be able to drive for so long then completely die and not start again.

i would check the idle speed motor like stated above me
did this just start out of nowhere? or did you install a part or do something to the car then this started?

 

battery volt to low or bad alternator can't keep up any more

 

When my battery was going bad this lights would dim at a stop sign but the engine never died. So, I suspect the ISC. That, or the voltage is going so low the ECU is stopping.

Put a volt meter across the battery posts and see what is happening.

 

the wiring is stock. nothing is added. there stock hid's

the problem has been like this for a long time. probably some time when tuning and the car started to make big power.

idle is 1200 ish. when the lights go on it drops 500ish. sometimes stalls out. when i fire it back up it kinda runs like crap for a minute.

battery is good. holds a charge just fine. the terminals are not loose.

the IAC in this car is brand new. it did this even on the old one witch is also good. i changed to a new one for another reason and it turned out the old one was good.

 

This also happens to me, but the car never dies.

 

have the computer had an after market reprogram ?