Hello, I have a 1991 Honda Civic Si that I did a motor swap in years ago. I dropped a D15B Vtec in it, that I ordered online. The car ran good for years, with the original PM6 ECU and the 0BD0 dizzy. Well, I just bought a parts car (93 civic ex) to try and breathe some

life back into my EF. The car came with a P28 ECU and a 0BD1 dizzy. This week I decided to put the P28 ECU, OBD1 dizzy, hook up all the harnesses, and get some Vtec! Well...It's not working out as planned, before I did this, It had the D15b Vtec motor, with 0BD0

dizzy and ECU and it ran fine. I installed all the harnesses (everything plugged straight up) I installed the new ECU and DIZZY; and the car fired right up but it will not rev over 2k rpm =-*( .

The car idles great at 1k rpm, as soon as you hit the throttle, though, it bogsdown and will not go over 2k. Please help me!!!

 

Seems like it could be the TPS on the throttle body. I'm sure once you search the website of issues like that, it will point you into components to test.

 

If your converting to obd1 you'll also need a 4 wire o2 sensor. Did you run the 2 extra wires for the obd1 dizzy to the ecu?

 

What extra 2 wires? dont you just get the jumper harness from OBD0 to OBD1?

 

the blue-green wire from the c1 ecu slot
and the blue -yellow wire from the c2 ecu slot
your supposed to run these two wires from your ecu harness plug into the engine bay and connect them to the dizzy
since your cars a si maybe there already there
but if there not, they need to be
those wires are for the crank angle sensor inside the dizzy
you need it to be able to drive right

 

Thank you Marcos!