I have a 95' Honda Civic 1.6ltr Vtec. As of yesterday I had NO PROBLEMs with it. It ran awesome. I installed a throttle body spacer (simple bolt off bolt on, no mods at all) Now my idle bounces from 1000 to ~1700 every second. I removed the spacer and put car back to original configuration and still the problem exists.
I have removed and cleaned the the IACV and the fast idle valve. Nothing helps. I have tapped on the IACV while it was running and there was no change in the idle. I measured resistance on the valve and i got 12 Ohms. Any ideas guys?

Try taking the grounding cable off the battery to reset the vehicle. See if that works.

Try taking the grounding cable off the battery to reset the vehicle. See if that works.

Ok. Im going to go do that right now. I will let you know. Thanks

It didnt work. How long should I leave it disconnected?

MAP sensor and TPS hooked up right (aka not switched)?

I dont think I switched them. I dont even think the TPS harness can reach the MAP sensor. But I will check and let you know.

Checked it, its hooked up right. This is very frustrating, my car was perfect two days ago now its F***ed up. It runs fine when i get over 1500 RPMs. But idling sucks, it bounces back and forth. sucks driving thru a parking lot going vroomm vrooom vrooom!

I talked to a mechanic today and he said that I need to pull out the Hazard fuse cause it resets the computer. He said that taking the ground of the battery does not reset the fault codes. I will try this when I get home...crossing fingures!

Ok, so that didnt work either! I checked the plugs to the MAP sensor and the IACV, I have 5vdc from them. So i know its not my wiring. Someone please help me out!!!

my civic was doing something real similiar to that.try loosing up the distributior and sliding it towards the front then tighten it back up. that worked for mine

I changed out the fast idle valve from a 93 civic and there was no change. My new IACV should be here tmaro, hopefully it works