my car is 95 honda civic ex stock. i have a realy bad fluctuating idle. this is what i already did
>new iavc (and also tryed my friends iavc)
>clean and adjust FITV
>new p28
>adjust valve latch
>new intake manifold gasket
>new tb gasket
>no air in coolant
>adjusted screw on tb
>tried use timing gun(i cant idle wont let me)

bad fluctuating idle when connected and no check engine. when i disconnect the IAVC it idles like it suppose too and check engine turns on. when connected u can actualy hear the IAVC going crazy sucking air and pausing and it sounds wierd. im out of ideas, im being searching for solution tried everything i found.

please need help any suggestion may help thank you

 

Could be a faulty MAP sensor. I've had one do that to me and not throw a code.

 

the thing that mine runs fine. it just have that crazy idle. did that happen to u

 

Ive been through this bullshit lol. You shouldve just cleaned your old iacv, but try cleaning the map sensor with air duster. Make sure the coolants hoses are on right and the iacv is on tight. Your throttle cable should have like 1/2 an inch of slack dont let that cable be too tight!

 

try checking for vacuum leaks with brake cleaner

 

i dont mean to intrude, but im having the same problem, and it seems like whatever I do I end up with more problems.Things I have done.
1.Flushed the coolant system
2.Replaced fuel filter
3.Clean FITV and IACV twice over with brake cleaner
4.Replace Intake Manifold gasket
5.Cleaner out the Intake Manifold with break cleaner
6.Checked TPS, but it seemed fine. (~0.45 @ closed)
7.Lubricated the throttle plate along with the spring on the TPS
8.Reset the ECU numerous times after cleaning each part.

My hypothesis: The break cleaner i used on the moving part of the IACV/FITV have cleaned them, but in the process drying them out to a point where they cannot move like like normal. Would using some sort of lube (WD-40) help at all? I will try this when I get home, but am mentioning it just incase someone has also encountered the same sort of mishap.

dfjr0926 I feel you struggle

 

I forgot to mention that my Del Sol has increasingly become more and more jerky and hesitant at lower rpm ( like its being clogged somehow), but I believe it to be the IACV for the sol fact that plugging the IACV hole from the throttle body helps smooth out the surging idle problem. It also seems logical that because its having problems when I let off the gas( at low rpm ), it is jerky and has died on me a few times. I am also thinking of just designing my own type of IACV, that just bypasses the current one. (would just let in enough oxygen for idling). Hope this helps in any way in a solution to all this.

 

i clean my map sensor it didnt work. so i got one from my buddys that has a known working map sensor but did the same thing. can it be the wiring harness or some kind of wiring.