So I did a swap for my buddy, its a OBD1 B16A (Japan spec) and with his JDM ecu he got with the swap everything runs fine But it does have a check engine light. So I brought over my Chipped P28 (US Spec) ECU with a Hondata S300 and plugged it in, The Check engine light code was for the knock sensor. Which I ended up wiring in. But regardless when I plugged in my ecu (chipped P28) his car essentially goes into limp mode. (see the video below) This video is obviously taken while the car is not moving, however when the car is moving it does the exact same thing. and this video is taken with the throttle completely pinned. (Im not fluctuating the pedal at all) Ive done 4+ swaps before and I have never ran into this issue. Anyone have any advice? AS you can see in the Video, there is no check engine light on, on the dash, and The Hondata Smanager even confirms this.

I havent looked at his car in about 3 weeks (he lives far away) but I will be working on it tomorrow and was seeing if anyone had any guidance with this issue.

http://s20.photobucket.com/user/liqu...fd0ad.mp4.html

Edit: trying to get the video to work here.

 

just sounds like a big *** vacuum leak causing idle surge.

 

Did you try your buddy's original JDM ECU after wiring in the knock sensor?

 

Its not a vacuum leak. It only surges like that when my boot is pressed on the gas. if I dont push the gas, it idles fine.


yes I tried the original ecu and it doesnt do that with his ecu only when the p28 with the s300 is when it does it.

I pulled the codes when his original jdm ecu was in and its throwing a codze 7. TPS. So I have another one here I am gunna try out on it and see if it makes it all better.

 

Today I datalogged and saved it. I have the datalogging but HT wont let me upload that type of file...

 

troubleshoot the TPS. if you replaced the TPS it's probably not sprung correctly. If you adjusted the idle screw or replaced the throttle body, recalibrate it in SManager. If there's no TPS voltage or the voltage doesn't change, you have a wiring issue. OR a bad S300.