Short story.. rebuild my D16Y7 non-vtec motor installed in my 91 EF hatch with DPFI to MPFI converted, PM6 ECU with 90-91 civic si intake manifold and TB.

The car was running fine, only one thing.. I found out bad oil leak in between lower head and intake manifold.. the head was cracked.

So I replaced the head.. and installed RC engineering bored out 59mm TB, Edelbrock ported 62mm Intake manifold Performer X, and GUDE bullfrog cam.

Now I turn the key, the idle went and stay @2500rpm?

Any ideas?

BTW, I clean the Idle valve control and still idle stay, stable @ 2500rpm.

Any helps?

 

did you clean the FITV?

 

As I remember you dont clean the FITV, correct? But I did same in this thread... https://honda-tech.com/forums/honda-crx-ef-civic-1988-1991-3/how-fix-your-idleing-woes-fitv-iacv-2153910/

I turned 2x clockwise, (Make it tighter) not overtight,.still same problem.. idle stay stable @ 2500rpm..?

 

Mmm, I had this problem, stuck at 2300.. I cleaned the FITV with WD40/gas now its not doing it any more..

 

have you tried ****in with the idle adj.screw