Honda Civic 2000 Automatic Transmission Rpm Drops down after 10 minutes of drive

[pwuser161678783762]

My Civic 2000 D16 NonV-tec automatic drops rpm after Driving approximately 10 minutes. All general tuning is done to it. New TPS sensor, serviced IACV and MAP sensor. Car is mechanically 100% all good.

[asadgitl]

This is natural behaviour when ECU goest to close loop after 60c temp and engines rpm set down by IAC , at close loop idle should be around 700 to 800 in N shift , you can adjust more or lest Rpm by adjusting IAC value

[pwuser161678783762]

Someone told me to get its Distributor checked. May be its ignition coil is weak, which is not that much good to give proper amount of current to the engine. Also i noticed that its fuel average came around 5Kilometers per litre. Car is also having black smoke from the exhaust.

[pwuser161678783762]

Can you guide me how i can adjust my IACV. I don’t rely on mechanics too much now because i am having this problem since too long and no one is that much experienced to have solution to my problem.

[Hassan1991]

Adjust the distributor using timing light.
Black smoke indicates rich micture.
Did someone messed with injectors, map or trim pot?

[asadgitl]

I agreed bro mostly machenic just hid and try and wast money unexceptional from customer , I never took my car to machenic , just do it my self and ma sha Allah getting more than 19km/L from my 2000 model 1000cc car, I had same issues but now engine performance just like new , any how I’ll help you best I can so remotely, for black carbon or smoke you have seriously consider over fuel burning issue there are many causes , injector leakage, wrong data sent by map/maf, temp sensor, air intake, O2 sensor bad etc , you have to verify one by one and fixed main cause step by step ,
For now your iac value can be check very easily I linked a video for reference

Good luck

[pwuser161678783762]

I live in Karachi. I traveled to Multan in my car last year. One of my injectors was not working and car was having a misfire so i took it to a local mechanic he did mess up with the injectors.

[Hassan1991]

Be sure they are oem and flowing equal amount of fuel. Get the flow tested.
Can you check the voltages of trim pot?

[pwuser161678783762]

Yes they are OEM and sometimes car struggles to start.

[pwuser161678783762]

Thanks everyone who helped me. My car is running perfect now. I removed the throttle body from the car and disassembled the IACV and cleaned it with the help of petrol. Later put back everything in the car. Now Allhumdulilah the car is running perfect. Thanks again everyone.