Hi guys, i have a 94 honda civic with a d16z6. When the car is cold it idles at about 1.5k rpms but once it warms up the idle drops down to about 100rpms, this suck because the whole car shakes. I tried adjusting the throttle screw but it wont work and yes i unplugged the iacv before adjusting. I also changed out the iacv and got a new tps sensor there are no vacume leakes either i checked for that. Can any poit out the problem? Thanks

 

It sounds like you need to clean out your FITV
https://honda-tech.com/forums/acura-integra-6/%2A%2A%2A-how-%2A%2A%2A-clean-your-fitv-aka-fast-idle-thermo-valve-1564019/

 

sometimes the idle regulator plunger cloggs up its easy to clean and can be found bolted to the inlet manifold i had the same problem and the car also does it after a weeks worth of no usage but settles into proper idle once it has done some miles

 

Ill clean the FITV today. And where is the idle regulator plunger? Thanks

 

I just cleaned the FITV, it wasnt that dirty but i cleaned it anyways. When i put it back the same thing happene,, the idle was still really low. I couldnt find the idle regulator plunger, do you havve any pics of it?

 

My hatch does the same thing... usually when I start it up first thing in the morning(it idles around 400-600 rpms) but after a couple seconds it idles normal.... cleaning the iacv helped out somewhat ill try cleaning out the fitv next

 

Have you tried adjusting the FITV?

 

Yea, and the idle only rises when its cold and once the car is warmed up it goes down to like 100rpms

 

Follow FSM procedure to adjust your idle speed. There's a how-to in the FAQs sticky. Also, at 100rpm your engine would stall itself out. Stock tachometers are notoriously inaccurate.

 

My engine dpesnt stall but it shakes like if it will stall

 

Like I said, at 100rpm, your engine WOULD stall.

Also, like I said, follow FSM procedure to readjust your idle.

 

What is FSM, im sorry?

 

Factory Service Manual.

Read the FAQ's sticky, the write up there follows FSM procedure.

 

Ok i just finished all the steps in the FSM and it worked for like 10 minutes the the idle dropped down again

 

I had the same problem and swapped out the iac and still had the same problem that started about a week later ended up having a bad iac and to replace it again