I'm not very knowledgeable on Integras or Hondas for that matter. I will try to describe my problem as completely as I can. I built a race car out of a 1997 Acura Integra GSR. It still has the B18C1 in it, but it was changed from OBD2 to OBD!. I think a 1995 Del Sol OBD1 harness was used. I am using a P28 ECU.

The car was finished and I ran a practice session one day and it ran great. The following day, I was running another practice session. A caution came out, I let off the throttle and the car quit. After getting the car back to the shop I found that the main power fuse had blown and the ECU fuse had blown. I checked the ECU and the R77 resistor had blown. Not being very familiar with these engine/ECU combo's, I checked the wiring for shorts, couldn't find any, so I turned the ignition switch on and it was still smoking the R77.

I did some reading and found out that I had the EVAP plug plugged into the IAT sensor. I connected it properly. I checked the sensor and it was melted, so I replaced it. I put a new ECU in and when I hit the ignition, it burnt the R77 again. It didn't get the Main power fuse or the ECU fuse though.

I unplugged the engine harness and hit the ignition switch again and it smoked the R77 again. I unplugged the ECU with the engine harness unplugged and checked every pin in the car harness with the ignition on. All the pins that were supposed to have power did, but there were two that weren't supposed to have power that did also. They were D10/ELD (electric load detector) and the A13 MIL (check/engine) By the way, I replaced the engine compartment fuse box, just in case.

Now I'm stuck and stupid. Any help would be appreciated.

 

Sounds like your grounding out the ecu somewhere it's common for the o2 sensor to get loose or have damaged wires causing a ground to the ecu fuse. Also check your main ground wires like the trans to chassis ground. And your p28 should be chipped if your running a b18c1 so I'd stick with that, another p28 ecu will not run your engine if I'm not mistaken maybe that's why it blew someone correct me if I'm wrong.

 

You shouldn't have to just an obd1 engine harness JUST because you're using an obd1 ecu, just get an obd2a to obd1 ecu conversion harness. Put back the stock original engine harness.

 

a p28 ecu will "run" a b18c1, however not totally correctly, or well....

 

Thanks. You are correct but I don't have the original harness.

 

It is chipped. Thanks

 

I've been given several things to check by members. As soon as it quits raining, I'm going to work on it. I'll let you guys know what i find out. I appreciate all the help.