well you guys probably know the symptoms car idles at about 2k when i start it up, then once it warms up idle jumps from 1k-2k . ive done a search but all the problems are for b16's or newer motors with fast idle valves etc. i have a zc.

ive checked for vacum leaks
sprayed every vac hose, connection, joint, gasket area with carb cleaner to see if there was a leak. found nothing
tried adjusting the tps, did nothing.
tried cleaning the throttle body/intake manifold. did nothing
checked/bled coolant. did nothing
sometimes i get a code 1 (oxygen content) so i replaced it. did nothing and i sometimes still get the code. i even turned down my FPR all the way thinking it was getting too much gas. made no difference

what else could it be? my eacv?

its really annoying

somebody help me please

 

check the functionality of your PCV valve. If it is bad, it causes a HUGE vaccum leak, and the idle air control motor will freak out.

 

so you don't have any IAC valve on your car ? how does it compensate for idles then ...?
idles will vary with temp changes, loads and etc..
I.E. hotter air will give you less dense air, therefore it takes more air to brings up the idle to where it needs to be, vice versa...same goes for AC as an extra load....

most of the time, the IAC screen to the IM is dirty and clogged up therefore the valve is sticking...use a carb cleaner on the screen to see if it may solve it...

 

well i just tried cleaning the eacv (same thing as iacv) cleaned the screen and inside it. didnt make a difference

 

hmmm. im gonna try another O2 sensor tomorrow. let you know what happens

 

Keep us posted; my ZC idle is ghey too...

jB

 

replaced the O2 sensor, still idles like crap.

what else could it be?

 

did you check to make sure the throttle body gasket was on properly? if its reversed it could block....

 

Hey I had the same problem w/ my del sol and my altima... I checked everthing and then I found if your car is a 97 and older, you need to put fuel injector cleaner in it every time you give it an oil change... Once I did that, it never idled crazy again...

 

its not the injectors they are brand new.

the throttle body gasket is fine too.

WTF!! i just put in a brand new O2 sensor, and i still get code 1 for oxygen content? how is that possible? i even messed with the regulator to try to make it run lean/rich and i still go the code. what the hell??

 

sounds kinda like a map sensor problem, check to see if there are any cel's from the ecu

 

Is there a short in the wires leading to the 02 sensor?

 

the only check engine light i am getting is code 1 which is oxygen content. and i just put a brand new O2 sensor in about 10 minutes ago. tried adjusting the regulator to lean it out or richen it up. makes no difference.

i'll try changing the map sensor anyways.

 

shouldnt be a short in the wires. i have the air/fuel gauge wire soldered into the O2 wire. shouldnt be shorted out. i'll check the connections at the ecu

 

wasnt the map sensor either. and there is no shorts in the O2 sensor wire.

 

one question, would a pcv valve from a 92 civic vx be different than one on my zc?

with the zc one in it idles about 2200 warming up

with the vx one in it idles about 3500

think the pcv's are different? or is my zc one bad? when i shake it i hear it rattle inside like something is loose, is it supposed to be like that? because when i shake the vx one nothing rattles.

 

When you shake the PCV you should hear the rattle. If you don't hear it toss it out.

 

ok i hear the rattle, so it is still good.

i just replaced the EACV, nope that wasnt it either.

 

FITV has a screw in plastic thing under the cover on one end of it. Take the cover off, screw the plastic thing back in, then put cover back on. The plastic screw backs out over time, allowing air to flow through the valve all the time instead of just when it's cold.

 

i dont think i have a FITV on my zc. i think thats only on b-series and new motors.

 

WOOHOO!! i fixed it. I had to adjust the TPS then reset the idle screw. idles perfect now at about 700. thanks for all your help guys and girls!

 

Ajust the TPS? How did you do that?

 

go to http://www.d16a.com there is an article about replacing the TPS. just do the same thing, loosen the screws then move it. best way is to use a voltmeter, get it as close to 0.5 volts as possible.