The engine is running very badly. pause during accelerations.On the tool shows error 14 IAC valve.I cleaned valve but in vain.I changed valve but it also makes.There are days in which the engine operates correctly without being lit error in the dashboard, especially at night when the temperature outside drops. Machine is Honda Civic ferio D15b vtec JDM 1992 .need help! thank you

 

If you reset the ECU, does code 14 return?

 

Yes it returns back.

 

Use a multimeter to test the two wires in the IACV connector for voltage and ground.

Code 14 is generally produces idle problems. What are they?

Or is the CEL code actually 10 and 4? ...or 1 and 4? ...or 41? Post a video.

 

I will test the voltage. thx

My tester shows error 14 System Fault IAC

 

An OBD1 code reader? Or by jumping the service connector?

Is there an idle problem?

 

by obd1 reader error is Sistem Fault Iac and by jumping the service connecter i have one long signal + four short signal.Yes is there idle problem.

 

Tell me how you know it's not two separate codes - 10 & 4?

You posted on a technical forum. Is there any logical reason to keep the nature of the idle problem a mystery?

 

-Because the signals are togheter and i take video to show you

-i posted here because it is a mystery for me also.I was at service and they told me that it`s the error 14. Not 10 and 4 . (tonight i drive and car went well not errors,but during the day i think that error is ON because of the outside temperature)

 

Describe the idle problem. Is it low, high, or surging?

 

View My Video

 

When the engine is warmed up and the idle is high, remove the intake system. Then use your finger to cover the hole inside the throttle body leading to the FITV. Does the idle speed drop?

Next, do the same test for the hole inside the throttle body leading to the IACV.

 

thank you for your advice .I will try and after I'll answer here.

 

I tested the both ideas.the problem is only at IACV.when i put my fingher to cover the hole for iacv everything become normall.what can i do ?

 

Did you already clean the IACV? If so, test whether the 2 wires in the IACV connector have battery voltage and ground. Also, Ohm test the IACV itself.


If those are fine, next test the ECT sensor and the TPS.

 

thanks for the advice.I will come back with an answer

 

I checked all the circuits and are very good. What can I do?

 

Give details about your tests and readings.

 

Contact ON
-Battery 12,30v
-Iacv 12,30v
Ohm test Valve Iacv-13,4 ohm
ECT-5v
TPS-4,8v

Today I cleaned the IACV and it does the same as before. When I drive and I want to accelerate the car goes disscontinued .Even if I remove the IACV jake ,the car works jerky (when I push the throttle constant at 1500 rpm the car works the same as in the video that I showed you.If I want to keep speed between 1500 and 2500 rpm the speeds suddenly jumps over 2500 rpm).

 

The FITV does not have a "jack" or plug. You must be confusing it with something else. Please take pics of what you think is the FITV.

 

Sorry my mistake. I wanted to write IACV . I know what is FITV.

 

Thank ****** god......

 

https://www.youtube.com/watch?v=QFk-...ature=youtu.be
today I shoot more detail what the problem has my car. Please watch and help me!thank you