EJ9B18C4

New Member
Joined
Oct 23, 2021
Messages
3
Car(s)
Stock EJ9, B18C4 swapped EJ9, EK1
Hello
I have 1999 EJ9 with b18c4 swap.
I done the swap 5 years ago with JDM OBD1 P72 ECU. I remember that we added a knock sensor to the engine block (Stock B18C4 don’t have one) and the car was great, no issues for the last 5 years. 2 months ago I started the car and there was a cel pops up. Cel codes 20+21 (ELD+Vtec) and no Vtec. I was trying to figure it out, changed the Vtec selonoid, wire from the selonoid to the ECU, conversion harness (OBD2B to OBD1), and still the same codes.
Last week I went to a friend and took from him chipped p28 with b18c map that I got him 2 years ago from the US, to try it-the cel was gone and the Vtec worked.
So I realized that I need new ECU.
I tried to find OBD1 P72 ECU, but I realized that they are really rare. So the ECU that I found was from the UK (here we don’t have any stock b series cars, or tuners, or nothing ) it is P9K ecu with immobilizer delete.
So my question is, there is any difference between OBD1 P72 ECU and the P9K ECU? I know the P9K is OBD2A with OBD1 plugs and you can’t chip it, and the P9K don’t have the speed limit and knock sensor, but mapping wise, power wise, there is any real difference? This ECU will be exactly the same when I’ll drive the car?
Thank you
 
For any future readers, the car is running exactly the same on the p9k ecu, same Vtec engagement, same everything as the P72, the only differences is that the P9K don’t have a knock sensor or speed limiter, have an immobilizer (if you want to use it on a swap you’ll have to delete it) and the obd1 connectors from the conversion harness (or just the harness if you’ve got obd1 harness) will plug and play AFTER you’ll shave a little bit of the plastic around the connectors, just 2 “lines” on the top of it, and it will plug in.
 
Back
Top