hi fellow techies,

did a k20a ITR swap in my 02 civic, but have an idle problem.... when car starts its around 2k but when u touch gas to rev, revs fine but when it drops down it cycles inbetween 2000 and 3000 rps.... could it be the IAT or MAP sensor? or maybe O2 sensor?? i have all wiring complete, and the mugen n1 ecu..... HELP PLEASE.

thanks,

Ken F.
NJ

 

it's the N1 ECU it will not idle like stock.

 

but even the ECU that the engine came with, the JDM one per say, does the same thing, i am wondering if the idle control valve is damaged .......... could it b anything else?

 

When I did my A2 to A swap, it was doing this, but it was from 700 to 1500. I was using the A2 throttle body so I could keep cruise control .. oh how I miss it!! Anyways, the IAT was damaged, switched back to the A throttle body and everything was fine. If you have a Helms manual, it describes how to test it out. Also, are all of the sensors/vacuum lines attached? That will cause this also.


Modified by k20whitevic at 11:46 PM 9/7/2004


Modified by k20whitevic at 11:52 PM 9/7/2004


Modified by k20whitevic at 11:52 PM 9/7/2004

 

i am thinking the IAT was damaged in transit, i am going to ck on the lines again 2b sure,,,, but once it starts, its stable, and when u rev it and let it go, the idle is all over the place...... can i use the IAT off of a k20a2 or k20a3 u think?

 

Reset the ECU. Mine does this occasionally. After the passing of the typhoon a few days ago, yesterday when I eventually drove the car again, it did this. Today at work, I disconnected the ECUs wiring harnesses for about 4 hours and at lunch, I plugged everything back in and all was back to normal. Previously, Honda reset my ECU with their plug-in device. Not sure what is causing it. The last time mine did this was also after a heavy heavy rain storm!!! ODD actually, don't know how that can be the cause. Also in the past, I have taken off the TB and cleaned it really well, reset the IAT, by loosening the screws and repositioning it. Try resetting the ECU and see what happens. Good luck with it, I know it is quite annoying. Yesterday in traffic I was just shutting the car off at red lights. Car revving up and down when at idle. I am just glad that my stock manifold and exhaust are back on at the moment or people would think I was an ******* behind the wheel trying to get them to move out of my way by constantly revving at them while at the red light!

 

sounds like there's a vacuum leak somewhere in the intake...

 

Did you check your throttle cable?

 

i have the type s throttle cable and its too long.... as the type r's throttle cable wheel is on a smaller distance......... but it is weird, as ill turn it on, it will b fine, and if i rev it, and let it drop down to idle, it idles crazy......

 

i had this problem on my 93 Si Hatch, it idled wierd even when i first started it, and it turned out that it was the Idle Control Valve or something like that. It was all corroded cause i sucked up water with the intake.

 

i unplugged the IAT sensor, but no difference, i cked the IAT valve and it has all oil in it YIKES, so going to try to clean it out and if not, get one off of an rsx or si if it fits. doing valve springs now, looks hot. if anyone wants to purchase ITR stock valve springs, PM me.

thx