Hello all, my gf recently purchashed a 95 civic ex with 188,xxx miles 5spd all stock. And since then it's been having fluctuating idle issues. The car drives fine and warms up fine, but once warmed up at a stop light or something, the engine will fluctuate from 800-1500 rpm(but it idles around 1k rpm coasting down a long hill) . This also happens everytime right at start up when the car is warm
, then maybe 30 sec - 1min. later, it will go to normal idle.
I've cleaned and adjusted the FITV. There is still a small suction on the bottom hole when warm, but I've plugged the hole w. my finger while the idle is fluctuating, but it didnt do anything.
I've bled the cooling system.
I've cleaned the IACV that came with the car and even tried 2 brand new ones, and the problem still occurs. The fluctuation dissappears when I unplug the IACV though.
Ive sprayed throttle body cleaner all over the intake mani, and vac hoses to check for vacuum leaks, but the idle didnt change at all.
Brand new O2 sensor, spark plugs and coolant temp sensor.
I saw a thread posted from sometime last week, and the OP thought it might've been the brake booster leaking. I disconnected the vacuum hose from the mani and plugged it, but it still does it at warm start up.
I've also disconnected the pcv hose, and plugged the vacuum source just to eliminate any vacuum leaks, but it still didnt fix the problem.
Could the MAP and TPS sensors cause this? I've been searching on how to check the sensors but each ones I come across give different wires to check. Can someone give me a link with the right answer? lol
I hope someone can help me out as im getting frustrated with this car
Thanks in advance