idel jump up and down
Recognized HCF Member
Joined: Sep 2007
Posts: 9,453
From: Houston, Texas
What year Civic do you have? Not all Civics have a fast idle valve.
Moderator
Joined: May 2007
Posts: 11,417
From: FL
I bought a new one. Auto parts stores don't have them, so you have to buy OEM Honda. It ran me about $60-70. The new one comes with all o-rings and everything you need.
Recognized HCF Member
Joined: Jun 2007
Posts: 10,023
Try unplugging the IACV. If the idle doesn't change, forget the sensors because the computer isn't what's making it idle high. There is something letting too much air into the engine. Also pinch off the vacuum hoses to the brake booster, EVAP canister, etc. Anything that leaks extra air into the intake will cause the idle speed to increase. The DPFI I don't think has a fast idle valve but it has some wacky stuff on the throttle shaft that the MPFI's don't.
Junior Member
Joined: Jan 2009
Posts: 8
From: Alabama
Ok today I tired these things on my 95 Civic(1.6 Vtec) My Issues are, Idle speed jumping up and down (1,200-1,800) now with this going on I can stop and turn it off and restart and its fine until I mash the gas....right back to idle problem......also with a cold morning start its idle is way high...near 3,000. Today I cleaned both IACV as well as FITV per directions I found here. I am still having the same problem. I have checked plugs,wires,coolent. Also as it was in up and down idle I also did a unplug on the AICV and I did settle down and the idle was very smooth. Begging for tips!...Thanks
Recognized HCF Member
Joined: Sep 2007
Posts: 9,453
From: Houston, Texas
Suction from the fast idle valve port should completely stop when the engine is warm. This is likely at least contributing if not completely causing the idle problem. Given that you have already cleaned the fast idle valve, you may need now to replace it. Solve this problem before doing anything more with the EACV/IACV.