alright so swapped in an h22 into my buddies 96 coupe dx the car starts with the stock ecu obd2 but when I use the jumper harness to obd1 with the p28 I get no spark any ideas?

 

Bad P28?

 

or bad jumper harness that's what I'm thinking

 

Quite possible.

 

ill try the ecu on another car tommorow

 

hi I’m having the same problem did u solve ur problem was it bad p28 or the conversion harness pls help me out thanks

 

It is one or the other... so try and eliminate one and then you know what the problem is in your case. Either try another ECU or try your current ECU is a friends Honda... if it works, then you know the harness adapter is the problem. If the ECU does the same thing in another car, or you try a "known good" ECU in your car, and it works... then you know the ECU is the problem.