i have a question, my car seems to idle between 1100-1500 at night, not during the day but only at night. i dont drive any diffently at night and day, but it only idles at night, no CEL, and the car runs fine. its been doing this for a couple of week, what do u guys believe is causing proplem?? please help

also my setup it b16 head w GSR cams, C1 block w/ JDM ITR pistons, and chipped p28, its in a 93 civic, if that helps, thanks

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by VictorySaber1 &raquo;</TD></TR><TR><TD CLASS="quote">i have a question, my car seems to idle between 1100-1500 at night, not during the day but only at night. i dont drive any diffently at night and day, but it only idles at night, no CEL, and the car runs fine. its been doing this for a couple of week, what do u guys believe is causing proplem?? please help

also my setup it b16 head w GSR cams, C1 block w/ JDM ITR pistons, and chipped p28, if that helps, thanks</TD></TR></TABLE>

Welcome to Honda-tech, seems everyone has an idle problem. What is the temperature difference between night and day? Also, does it do this all the time even when warmed up? Turning on air and lights cause our idle to be higher, do you have anything hooked up that really drains power?

 

no i dont have any thing that drains power, and the temp lately has been at night 65-70 and during the day 80-85, it only does it when i begin driving after awhile, not when its cold or when its warming up, only after i start driving, sometimes it goes away but most of the time it stays, also its in a 93 civic

 

Engine maybe dont like been in the dark...J/K..

Anyways..you said after you drive or before you drove the car it cant idle?? Some time in latest model if you dont let the car warm up be4 driving then car will have tuff time picking up idle...
Oil problem maybe??
How the collan temp?
bad spark? spark wire? (maybe is this one)
Fuel delivery shortage?
Did you do many Mod on the car???

 

lol, that what i think

 

help

 

The only thing I can deduce from reading you post about night and day is that during the night you (obviously) have your headlights on. Now with every car, when you start turning on electrical items (headlights, rear defogger, etc.), the cars idle will kick up a little to help compensate for the engine load. Does you idle problem happen when any other eletrical accessories are on?

My suggestion would be:
1 - make sure your base idle is set correctly (unplug IACV when doing this)
2 - make sure your alternator and voltage regulator are working properly

HTH