When my car is cold my idle is at 700 rmps or so and when it warms up after drving for like 10 minutes my idle fluctuates from 900 to 1000 rmps a few tims then sits at 900 and make a little ratling sound???

 

yea mine has the same problem, i believe ( correct me if im wrong ) it may be the idle control valve that needs replacement, 150-200 bucks.

http://www.drivewire.com/honda....html

not positive tho

 

Before doing that, why dont you take it apart and clean out the little filter mesh element inside...then get a new one if it doesn't work

 

I ahve already cleanded it twice plus the throttle body plus got the tps calibrated!!

 

What car/engine? It could be the IACV or it could be the FITV (Fast Idle Thermo Valve). Any CELs?

 

I have a 2000 civic 2dr coupe with a 98 jdm b18b (comp 9.4 vs us 9.2) connected to a obd1 us p75 ecu! Mods = cold air intake, 4-2-1 jdm headers with custom 2 1/4" collecter, magnaflow 2 1/4" cat and custom cat back to a Remus racing muffler....also ACT stage 1 clutch wth dc sport short throw!!!

This could sound stupid but what are cels....I'm learning as I go!!!