Hondata

i got a b18c block with ported b16 head. now i have the s300 and when i turn the car on it idles like shit. it keeps reving then going back down. cant seem to find out what it is. now i have a p28 with a skunk 2 chip also. i put that ecu in and it idles fin. put the s300 in idles horrible. now i tried the s300 on my friend single cam and it idles fine. what could be wrong??????

I have this same issue with my b16a2.... I havn't found out what it could be....

Have you tried adjusting the idle settings in the software?

yeah I have it all equalized out to 800rpm's at idle... and since it has gotton cold, when i give it gas and let off, the idle goes up and starts surging up and down... any ideas of what this might be? bad Idle air control valve? it worked fine before hondata though....

To adjust the idle speed:

1. Warm up the engine.
2. Set the idle speed to 850 rpm and move the duty cycle adjustment to the middle.
3. Unplug the idle valve.
4. Adjust the bypass screw until the engine runs at 450 rpm. If you can not reduce the idle to 450 rpm, then you have an air leak. Fix this before proceeding. If the engine will not run with the idle valve disconnected then your bypass port is clogged. Fix this before proceeding.
5. Plug the idle valve back in.
6. Clear the idle valve error.
You should now get a smooth idle at 850 rpm.
7. Increase the engine speed to 2500 - 3000 rpm and abruptly let off the throttle. If the engine speed dips below 850 rpm, move the duty cycle slider to the right. If the engine speed hangs above 850rpm for some time, move the duty cycle slider to left.
Some engines prefer 900 or 950 rpm idle speed.