and I brought it to AZ and their scanner produces a P0505 code, Idle Air Control system? It feels like it is losing power under load, but when it idles it is fine, and also when I free rev it in neutral the revs rise perfectly fine. If my IACV is bad, it will affect idling, right? I want to know WTF is wrong with my car before I drop more money I don't have($170) on this fvcking thing. Halp! Car is a 98 Civic EX 5 speed.

Also, it is not constant. Tonight as soon as the CEL came on, it starting driving like this(first gear feels like I'm driving with a 1 oz. flywheel) until I turned the car off. Then when I drove to Autozone and back to get the CEL code, it drove fine.... and then when I drove the car the next time, the problem eventually came back.

 

Bump, searched for over an hour, to no avail

 

Bump, I just replaced the IACV and the problem still persists. Anybody at all?

 

Hrmm. My car also hesitates and sorta nosedives when I get off the gas. I also have an idle problem. Im pretty sure its the FITV, I just haven't gotten around to cleaning it. It idles fine but when the engine gets hot it gets bouncy. I'll def have to clean my FITV soon as the summer is getting hotter and hotter. Its pretty simple, its 3 bolts under the throttle body and then 2 bolts inside it to disasemble it. Its just that my bolts are sorta of seized so I've been spraying PB blaster to loosen it. Get it checked out. Check the FAQ, theres a how-to there for the FITV.

 

My problem is an intermittent one. It is hit or miss; it is running perfectly fine, and the CEL will stay off(after I reset the ECU) and then bam it comes on and runs like ****, and then I kill the engine, for only a few seconds, and turn it back on and it runs perfectly.

 

Afternoon bump

 

Im not sure but maybe your brakes are catching? If they are it would feel like a loss of power and everything would be fine in neutral and idle. Maybe it would nose dive if its catching really bad.

 

The CEL always comes on as soon as this starts. I have checked the code a few times, it's always "idle air control system malfunction" yet I just replaced the IACV with one that is much cleaner than the original and it is doing it again. It is something electrical I believe. Could the fact that it ALWAYS returns to normal, at least for a while, when I kill the engine and restart it, mean the ECU is at fault?

 

i had the same exact problem. fixed it by rerunning fresh fresh wires from the iac to the ecu. i dont think they were making proper contact.

 

Was it as random/intermittent as my problem? One thing I don't get is, why turning the engine off, even for a few seconds, ALWAYS makes it run fine when I restart it?

 

check timing if nothing else works

 

K, I took the IACV connector off and drove around the block... apparently there is a bad connection, because it drove exactly the same as it intermittently does, for the entire trip. I sprayed the connector real good with contact cleaner and am letting the ECU reset to clear the CEL. Hopefully the problem doesn't return this weekend.

If it does, does anybody have any idea how to hardwire it to the ecu or whatever?

 

Well, it didn't work. It acted up shortly after cleaning and reconnecting the IACV. Is there anything in the engine bay I can wire this bitch up to? Or does it have to have a good connection back to the ECU?

 

yea was was as intermittent as your problem, and yes, every time i shut it off it did temporarily fix the problem. i would suggest to hard wire the iac. depending on what ecu ur running, there's diagrams here on honda-tech with pinouts of the ecus.

 

I guess I'll have to search for that and try to do that. Goddamnit I REALLY hate electrical work though, and it only figures that I need to do something like this to get the car running normal again. Why can't it be something relatively simple, like the alternator? I'd rather spend 2x as much to replace something like that than sit and try to wire bullshit :thumb down:: thumbdown:

 

check your relay's...you might have to take them in somewhere to do that tho.