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So I'm still getting a CEL :/
https://www.thejdm.com/forum/viewtopic.php?f=52&t=4731		 Page 1 of 2
Author:  sfc [ September 26, 2005 ]
Post subject:  So I'm still getting a CEL :/
Swapped out the IACV, still getting this CEL. NOT TOO HAPPY! What's really odd is, after having the ECU pulled for like a day, I plugged it back in, drove around last night. I drove around for a good 30 minutes, got it heated up all the way, let it idle, it was fine. I mean, I was idling for a good 3-5 minutes at several stoplights last night, no issues. Then today, on the way to work, I was idling for MAYBE 45 seconds, and the CEL kicked in, and then I got the loopy throttle. I'm thinking that my only option left is to replace the ECU. Anyone else have any ideas?

Symptoms again:

Once the car is up to temp, when idling at say a stoplight, the idle will kind of fluxuate up and down in a 100rpm range, then all the sudden it will jump about 400 rpm, and the CEL will kick in. Then, if I bring the revs up to ~2k, it'll just go nuts surging and dropping. Not only that, when driving at any speed, if I let off the gas, it feels like the car is driving through about an inch of tar, you can just feel a serious decel.

I'm really leaning towards ECU at this point because I really don't see what else would be causing this.
Author:  munster [ September 26, 2005 ]
Post subject: 
What code is it throwing?
Author:  sfc [ September 26, 2005 ]
Post subject: 
505 if I remember right, I'd have to look again. It referred to the idle system, but didn't actually specify WHAT in the idle system.
Author:  sfc [ September 26, 2005 ]
Post subject: 
Man, my memory si the shit today :>

P0505 Idle Control System Malfunction

^^that would be the error
Author:  Nikku [ September 26, 2005 ]
Post subject: 
try cleaning the IACV
Author:  sfc [ September 26, 2005 ]
Post subject: 
temp wrote:try cleaning the IACV

... I just replaced the IACV
Author:  Nikku [ September 26, 2005 ]
Post subject: 
sfc wrote:
temp wrote:try cleaning the IACV

... I just replaced the IACV

d'oh! hmmm is this a swap?
Author:  sfc [ September 26, 2005 ]
Post subject: 
well, technically it probably is. Not the original motor from the car. But it's still a b16 in an 00 civic si. I think it's obd1 instead of obd2, but I've had it for over a year and put probably 30k miles on it without issue before.
Author:  Nikku [ September 26, 2005 ]
Post subject: 
sfc wrote:well, technically it probably is. Not the original motor from the car. But it's still a b16 in an 00 civic si. I think it's obd1 instead of obd2, but I've had it for over a year and put probably 30k miles on it without issue before.

hmmm thats a tough one, i mean i doubt its the ECU since the problem seems a little intermittent, i would lean towards something else but its hard to say. how long ago did the problem start?
Author:  sfc [ September 26, 2005 ]
Post subject: 
can't even say for sure. Probably month or two ago. I'm still leaning towards it started being a bitch when I hooked up an o2 guage, but I removed that quite a while ago and it's still being a bitch. Plus I can't remember if it was doing it before that or not.
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