Hondata

Hi there I'm getting a Code 8 TDC hard fault-as in the code comes back immediately. It's a 1990 civic with a B18A1 turbo OBD0 to OBD1 swap PR4 ECU. I've checked the wires from the ECU to the dizzy and they're good and the timing is set. I've also tried a new dizzy. The car will run and drive okay with the CEL on but under heavier loads (generally over 110kPa) it will cut the injectors in and out, TPS stays consistent. Wondering if this is a limp mode and how I can possibly fix the CEL.

Try the ECU in a known working vehicle and see if you have the same error, if you do the ECU may be damaged. If the problem does not follow the ECU then you have either a mechanical or wiring related problem in your car.

So I've tried a new ecu, a new distributor, and ran new wires bypassing the connectors in the car. Tried with the base timing connector jumpered and un-jumpered. Kinda out of ideas now...

Have you tried your ECU in a known working vehicle?